Notice of Expiration of Patents
                     Due to Failure to Pay Maintenance Fee

   35 U.S.C. 41 and 37 CFR 1.362(g) provide that if the required
maintenance fee and any applicable surcharge are not paid in a patent
requiring such payment, the patent will expire at the end of the 4th, 8th
or 12th anniversary of the grant of the patent depending on the first
maintenance fee which was not paid.
   According to the records of the Office, the patents listed below have
expired due to failure to pay the required maintenance fee and any
applicable surcharge.

                    PATENTS WHICH EXPIRED ON April 19, 2000
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number             Serial Number                Issue Date

4,737,997                   06/878,435                   04/19/88
4,737,999                   07/009,810                   04/19/88
4,738,000                   06/871,796                   04/19/88
4,738,006                   06/923,495                   04/19/88
4,738,012                   07/064,664                   04/19/88
4,738,013                   06/898,070                   04/19/88
4,738,014                   06/944,488                   04/19/88
4,738,022                   06/915,659                   04/19/88
4,738,025                   06/945,563                   04/19/88
4,738,027                   06/896,491                   04/19/88
4,738,030                   06/916,635                   04/19/88
4,738,034                   06/942,087                   04/19/88
4,738,040                   06/861,268                   04/19/88
4,738,041                   06/857,106                   04/19/88
4,738,042                   06/920,505                   04/19/88
4,738,052                   07/028,790                   04/19/88
4,738,056                   07/027,294                   04/19/88
4,738,059                   06/825,046                   04/19/88
4,738,062                   06/860,630                   04/19/88
4,738,066                   06/796,174                   04/19/88
4,738,068                   07/002,517                   04/19/88
4,738,073                   06/918,889                   04/19/88
4,738,076                   07/025,661                   04/19/88
4,738,088                   06/905,404                   04/19/88
4,738,089                   07/006,744                   04/19/88
4,738,100                   06/849,154                   04/19/88
4,738,105                   07/017,822                   04/19/88
4,738,108                   06/904,806                   04/19/88
4,738,110                   07/030,347                   04/19/88
4,738,116                   06/881,838                   04/19/88
4,738,118                   07/015,023                   04/19/88
4,738,123                   06/761,765                   04/19/88
4,738,124                   07/068,882                   04/19/88
4,738,132                   06/891,453                   04/19/88
4,738,139                   07/001,905                   04/19/88
4,738,157                   06/914,526                   04/19/88
4,738,166                   06/909,194                   04/19/88
4,738,175                   06/813,121                   04/19/88
4,738,176                   06/915,090                   04/19/88
4,738,180                   06/899,553                   04/19/88
4,738,183                   06/845,331                   04/19/88
4,738,191                   06/902,188                   04/19/88
4,738,198                   06/841,095                   04/19/88
4,738,203                   06/888,588                   04/19/88
4,738,205                   07/057,778                   04/19/88
4,738,212                   06/917,063                   04/19/88
4,738,214                   07/017,743                   04/19/88
4,738,216                   06/935,748                   04/19/88
4,738,219                   07/069,078                   04/19/88
4,738,220                   06/856,232                   04/19/88
4,738,245                   07/098,404                   04/19/88
4,738,251                   07/017,050                   04/19/88
4,738,262                   07/019,686                   04/19/88
4,738,265                   07/031,872                   04/19/88
4,738,284                   07/060,992                   04/19/88
4,738,288                   06/904,505                   04/19/88
4,738,298                   06/883,800                   04/19/88
4,738,301                   06/892,475                   04/19/88
4,738,320                   06/749,286                   04/19/88
4,738,327                   06/903,146                   04/19/88
4,738,330                   06/841,751                   04/19/88
4,738,335                   07/070,184                   04/19/88
4,738,336                   07/043,062                   04/19/88
4,738,350                   06/848,907                   04/19/88
4,738,356                   06/941,122                   04/19/88
4,738,357                   07/034,728                   04/19/88
4,738,358                   06/930,870                   04/19/88
4,738,360                   06/906,314                   04/19/88
4,738,366                   07/033,031                   04/19/88
4,738,388                   06/756,095                   04/19/88
4,738,397                   06/903,991                   04/19/88
4,738,398                   06/890,277                   04/19/88
4,738,401                   07/017,871                   04/19/88
4,738,417                   07/010,099                   04/19/88
4,738,422                   06/929,547                   04/19/88
4,738,423                   07/004,994                   04/19/88
4,738,427                   06/927,352                   04/19/88
4,738,433                   06/839,263                   04/19/88
4,738,439                   06/943,392                   04/19/88
4,738,453                   07/086,485                   04/19/88
4,738,456                   07/038,292                   04/19/88
4,738,464                   07/030,468                   04/19/88
4,738,471                   07/031,586                   04/19/88
4,738,488                   07/040,197                   04/19/88
4,738,490                   06/910,365                   04/19/88
4,738,493                   06/864,490                   04/19/88
4,738,499                   06/845,326                   04/19/88
4,738,504                   06/893,825                   04/19/88
4,738,517                   06/901,299                   04/19/88
4,738,526                   06/933,170                   04/19/88
4,738,527                   06/876,137                   04/19/88
4,738,528                   07/033,569                   04/19/88
4,738,533                   06/792,682                   04/19/88
4,738,534                   07/030,931                   04/19/88
4,738,535                   06/888,122                   04/19/88
4,738,546                   06/849,209                   04/19/88
4,738,554                   06/894,720                   04/19/88
4,738,558                   06/872,708                   04/19/88
4,738,561                   06/797,449                   04/19/88
4,738,578                   06/793,923                   04/19/88
4,738,579                   06/863,438                   04/19/88
4,738,582                   06/940,782                   04/19/88
4,738,589                   06/939,884                   04/19/88
4,738,596                   07/079,669                   04/19/88
4,738,614                   06/889,199                   04/19/88
4,738,624                   07/037,916                   04/19/88
4,738,640                   07/042,421                   04/19/88
4,738,662                   06/813,730                   04/19/88
4,738,668                   06/527,604                   04/19/88
4,738,678                   07/024,611                   04/19/88
4,738,691                   07/001,140                   04/19/88
4,738,698                   07/049,884                   04/19/88
4,738,702                   06/915,763                   04/19/88
4,738,704                   07/046,121                   04/19/88
4,738,711                   06/902,088                   04/19/88
4,738,712                   06/853,716                   04/19/88
4,738,718                   06/792,025                   04/19/88
4,738,719                   07/035,180                   04/19/88
4,738,723                   06/738,893                   04/19/88
4,738,724                   06/909,525                   04/19/88
4,738,733                   07/001,896                   04/19/88
4,738,743                   06/829,542                   04/19/88
4,738,745                   07/033,108                   04/19/88
4,738,751                   06/810,350                   04/19/88
4,738,755                   07/024,165                   04/19/88
4,738,761                   06/916,007                   04/19/88
4,738,762                   06/903,722                   04/19/88
4,738,763                   06/841,486                   04/19/88
4,738,771                   06/817,351                   04/19/88
4,738,785                   07/014,561                   04/19/88
4,738,794                   06/894,278                   04/19/88
4,738,802                   06/552,281                   04/19/88
4,738,804                   06/766,134                   04/19/88
4,738,806                   06/892,085                   04/19/88
4,738,812                   06/440,755                   04/19/88
4,738,813                   06/860,515                   04/19/88
4,738,817                   06/910,106                   04/19/88
4,738,820                   06/933,716                   04/19/88
4,738,840                   06/902,430                   04/19/88
4,738,843                   07/005,302                   04/19/88
4,738,844                   06/623,814                   04/19/88
4,738,845                   06/623,894                   04/19/88
4,738,853                   06/719,953                   04/19/88
4,738,854                   06/865,493                   04/19/88
4,738,865                   07/022,517                   04/19/88
4,738,870                   06/845,292                   04/19/88
4,738,878                   07/031,564                   04/19/88
4,738,880                   06/840,174                   04/19/88
4,738,885                   06/832,137                   04/19/88
4,738,887                   06/817,394                   04/19/88
4,738,888                   07/033,534                   04/19/88
4,738,889                   06/923,386                   04/19/88
4,738,902                   06/830,825                   04/19/88
4,738,910                   06/872,506                   04/19/88
4,738,916                   06/884,977                   04/19/88
4,738,922                   06/614,297                   04/19/88
4,738,955                   06/770,505                   04/19/88
4,738,957                   06/842,691                   04/19/88
4,738,961                   06/404,870                   04/19/88
4,738,973                   06/905,525                   04/19/88
4,738,978                   06/928,947                   04/19/88
4,738,979                   06/823,157                   04/19/88
4,738,980                   06/783,508                   04/19/88
4,738,985                   06/841,214                   04/19/88
4,738,988                   07/044,190                   04/19/88
4,738,993                   06/790,290                   04/19/88
4,739,006                   07/003,739                   04/19/88
4,739,009                   07/036,737                   04/19/88
4,739,016                   06/756,401                   04/19/88
4,739,020                   06/946,257                   04/19/88
4,739,023                   06/914,412                   04/19/88
4,739,024                   07/004,226                   04/19/88
4,739,025                   06/859,298                   04/19/88
4,739,027                   06/809,707                   04/19/88
4,739,029                   07/039,104                   04/19/88
4,739,030                   06/816,489                   04/19/88
4,739,046                   06/767,388                   04/19/88
4,739,050                   06/928,277                   04/19/88
4,739,054                   07/028,747                   04/19/88
4,739,060                   06/896,197                   04/19/88
4,739,068                   06/887,762                   04/19/88
4,739,075                   07/014,925                   04/19/88
4,739,081                   06/667,398                   04/19/88
4,739,096                   06/894,329                   04/19/88
4,739,100                   06/780,902                   04/19/88
4,739,102                   07/043,900                   04/19/88
4,739,103                   06/697,513                   04/19/88
4,739,104                   06/494,675                   04/19/88
4,739,106                   06/865,654                   04/19/88
4,739,112                   06/697,508                   04/19/88
4,739,120                   06/898,662                   04/19/88
4,739,121                   06/904,078                   04/19/88
4,739,127                   07/012,296                   04/19/88
4,739,135                   07/045,979                   04/19/88
4,739,136                   06/932,321                   04/19/88
4,739,143                   06/739,578                   04/19/88
4,739,147                   07/008,809                   04/19/88
4,739,154                   06/903,718                   04/19/88
4,739,161                   06/870,814                   04/19/88
4,739,165                   06/833,975                   04/19/88
4,739,171                   06/789,994                   04/19/88
4,739,173                   06/896,730                   04/19/88
4,739,180                   07/026,905                   04/19/88
4,739,183                   06/888,805                   04/19/88
4,739,185                   06/942,288                   04/19/88
4,739,193                   06/924,867                   04/19/88
4,739,197                   06/849,009                   04/19/88
4,739,199                   06/875,740                   04/19/88
4,739,202                   07/009,920                   04/19/88
4,739,209                   06/915,976                   04/19/88
4,739,213                   06/816,184                   04/19/88
4,739,222                   06/859,692                   04/19/88
4,739,224                   06/841,560                   04/19/88
4,739,229                   07/098,578                   04/19/88
4,739,238                   07/071,179                   04/19/88
4,739,242                   06/860,805                   04/19/88
4,739,246                   07/056,499                   04/19/88
4,739,247                   07/064,953                   04/19/88
4,739,250                   06/932,261                   04/19/88
4,739,252                   06/855,241                   04/19/88
4,739,254                   06/916,569                   04/19/88
4,739,255                   06/867,976                   04/19/88
4,739,261                   06/787,485                   04/19/88
4,739,269                   07/000,406                   04/19/88
4,739,289                   06/933,820                   04/19/88
4,739,292                   06/938,973                   04/19/88
4,739,293                   07/016,415                   04/19/88
4,739,306                   06/927,724                   04/19/88
4,739,310                   06/792,563                   04/19/88
4,739,319                   06/763,987                   04/19/88
4,739,327                   06/843,071                   04/19/88
4,739,330                   06/746,328                   04/19/88
4,739,358                   06/880,558                   04/19/88
4,739,367                   06/923,281                   04/19/88
4,739,393                   06/925,943                   04/19/88
4,739,400                   07/056,934                   04/19/88
4,739,404                   06/853,233                   04/19/88
4,739,410                   06/942,668                   04/19/88
4,739,422                   06/825,995                   04/19/88
4,739,426                   06/921,246                   04/19/88
4,739,430                   06/883,632                   04/19/88
4,739,445                   06/760,263                   04/19/88
4,739,447                   06/783,380                   04/19/88
4,739,465                   06/884,366                   04/19/88
4,739,472                   06/805,794                   04/19/88
4,739,473                   06/793,047                   04/19/88
4,739,481                   06/800,077                   04/19/88
4,739,483                   06/636,603                   04/19/88
4,739,489                   06/767,797                   04/19/88
4,739,495                   06/779,862                   04/19/88
4,739,502                   06/894,148                   04/19/88
4,739,504                   06/740,678                   04/19/88
4,739,511                   06/821,188                   04/19/88
4,739,516                   06/819,697                   04/19/88

                    PATENTS WHICH EXPIRED ON April 14, 2000
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

5,103,500                   07/704,852                   04/14/92
5,103,508                   07/627,088                   04/14/92
5,103,515                   07/746,224                   04/14/92
5,103,522                   07/552,381                   04/14/92
5,103,523                   07/631,320                   04/14/92
5,103,538                   07/668,047                   04/14/92
5,103,541                   07/718,272                   04/14/92
5,103,545                   07/541,150                   04/14/92
5,103,547                   07/662,949                   04/14/92
5,103,554                   07/533,824                   04/14/92
5,103,555                   07/744,842                   04/14/92
5,103,560                   07/531,081                   04/14/92
5,103,562                   07/604,161                   04/14/92
5,103,573                   07/705,946                   04/14/92
5,103,577                   07/441,457                   04/14/92
5,103,578                   07/675,438                   04/14/92
5,103,587                   07/651,765                   04/14/92
5,103,590                   07/542,884                   04/14/92
5,103,596                   07/609,426                   04/14/92
5,103,597                   07/538,542                   04/14/92
5,103,604                   07/503,387                   04/14/92
5,103,608                   07/658,958                   04/14/92
5,103,614                   07/412,607                   04/14/92
5,103,618                   07/488,664                   04/14/92
5,103,619                   07/579,808                   04/14/92
5,103,624                   07/637,197                   04/14/92
5,103,625                   07/612,242                   04/14/92
5,103,635                   07/578,675                   04/14/92
5,103,651                   07/575,836                   04/14/92
5,103,654                   07/596,813                   04/14/92
5,103,662                   07/517,117                   04/14/92
5,103,672                   07/588,537                   04/14/92
5,103,674                   07/629,723                   04/14/92
5,103,676                   07/642,578                   04/14/92
5,103,677                   07/570,053                   04/14/92
5,103,681                   07/556,786                   04/14/92
5,103,683                   07/638,920                   04/14/92
5,103,684                   07/711,126                   04/14/92
5,103,685                   07/600,007                   04/14/92
5,103,687                   07/592,704                   04/14/92
5,103,695                   07/591,802                   04/14/92
5,103,696                   07/640,725                   04/14/92
5,103,697                   07/661,062                   04/14/92
5,103,698                   07/726,397                   04/14/92
5,103,699                   07/666,575                   04/14/92
5,103,701                   07/678,488                   04/14/92
5,103,703                   07/593,207                   04/14/92
5,103,712                   07/688,853                   04/14/92
5,103,714                   07/716,550                   04/14/92
5,103,715                   07/412,530                   04/14/92
5,103,716                   07/583,861                   04/14/92
5,103,718                   07/534,130                   04/14/92
5,103,724                   07/753,071                   04/14/92
5,103,727                   07/753,406                   04/14/92
5,103,732                   07/655,653                   04/14/92
5,103,734                   07/631,098                   04/14/92
5,103,735                   07/718,045                   04/14/92
5,103,742                   07/651,656                   04/14/92
5,103,744                   07/549,016                   04/14/92
5,103,745                   07/762,808                   04/14/92
5,103,749                   07/623,944                   04/14/92
5,103,752                   07/506,159                   04/14/92
5,103,754                   07/566,043                   04/14/92
5,103,760                   07/627,988                   04/14/92
5,103,763                   07/677,299                   04/14/92
5,103,764                   07/758,178                   04/14/92
5,103,767                   07/476,378                   04/14/92
5,103,770                   07/726,741                   04/14/92
5,103,771                   07/696,237                   04/14/92
5,103,776                   07/720,085                   04/14/92
5,103,788                   07/671,401                   04/14/92
5,103,792                   07/598,035                   04/14/92
5,103,796                   07/518,983                   04/14/92
5,103,797                   07/665,467                   04/14/92
5,103,800                   07/698,799                   04/14/92
5,103,801                   07/491,040                   04/14/92
5,103,808                   07/434,088                   04/14/92
5,103,809                   07/622,594                   04/14/92
5,103,815                   07/624,497                   04/14/92
5,103,830                   07/591,410                   04/14/92
5,103,832                   07/596,191                   04/14/92
5,103,834                   07/513,584                   04/14/92
5,103,849                   07/627,862                   04/14/92
5,103,850                   07/680,080                   04/14/92
5,103,853                   07/669,427                   04/14/92
5,103,855                   07/722,222                   04/14/92
5,103,870                   07/371,460                   04/14/92
5,103,876                   07/661,465                   04/14/92
5,103,882                   07/757,238                   04/14/92
5,103,884                   07/474,280                   04/14/92
5,103,888                   07/636,320                   04/14/92
5,103,891                   07/577,289                   04/14/92
5,103,892                   07/731,390                   04/14/92
5,103,894                   07/666,585                   04/14/92
5,103,896                   07/679,097                   04/14/92
5,103,898                   07/551,193                   04/14/92
5,103,901                   07/597,361                   04/14/92
5,103,903                   07/625,000                   04/14/92
5,103,908                   07/715,415                   04/14/92
5,103,909                   07/657,031                   04/14/92
5,103,910                   07/471,200                   04/14/92
5,103,917                   07/516,035                   04/14/92
5,103,930                   07/499,378                   04/14/92
5,103,937                   07/677,635                   04/14/92
5,103,938                   07/604,154                   04/14/92
5,103,941                   07/677,008                   04/14/92
5,103,944                   07/287,556                   04/14/92
5,103,947                   07/711,943                   04/14/92
5,103,955                   07/500,638                   04/14/92
5,103,956                   07/575,628                   04/14/92
5,103,968                   07/641,425                   04/14/92
5,103,969                   07/661,689                   04/14/92
5,103,975                   07/616,508                   04/14/92
5,103,987                   07/660,540                   04/14/92
5,103,991                   07/665,979                   04/14/92
5,103,992                   07/762,650                   04/14/92
5,103,995                   07/711,093                   04/14/92
5,104,001                   07/699,433                   04/14/92
5,104,009                   07/619,231                   04/14/92
5,104,015                   07/531,569                   04/14/92
5,104,017                   07/774,569                   04/14/92
5,104,019                   07/591,722                   04/14/92
5,104,023                   07/681,670                   04/14/92
5,104,027                   07/610,589                   04/14/92
5,104,028                   07/633,938                   04/14/92
5,104,029                   07/551,290                   04/14/92
5,104,030                   07/627,472                   04/14/92
5,104,031                   07/722,689                   04/14/92
5,104,058                   07/572,891                   04/14/92
5,104,063                   07/515,410                   04/14/92
5,104,068                   07/565,963                   04/14/92
5,104,069                   07/604,471                   04/14/92
5,104,072                   07/633,768                   04/14/92
5,104,074                   07/370,802                   04/14/92
5,104,076                   07/597,068                   04/14/92
5,104,080                   07/641,008                   04/14/92
5,104,084                   07/587,449                   04/14/92
5,104,089                   07/417,744                   04/14/92
5,104,093                   07/661,844                   04/14/92
5,104,097                   07/583,058                   04/14/92
5,104,107                   07/694,061                   04/14/92
5,104,109                   07/412,222                   04/14/92
5,104,117                   07/401,529                   04/14/92
5,104,125                   07/464,905                   04/14/92
5,104,126                   07/726,749                   04/14/92
5,104,127                   07/559,712                   04/14/92
5,104,129                   07/613,587                   04/14/92
5,104,130                   07/683,848                   04/14/92
5,104,140                   07/709,619                   04/14/92
5,104,149                   07/646,410                   04/14/92
5,104,152                   07/442,080                   04/14/92
5,104,154                   07/510,849                   04/14/92
5,104,157                   07/591,735                   04/14/92
5,104,163                   07/743,199                   04/14/92
5,104,164                   07/535,449                   04/14/92
5,104,165                   07/756,836                   04/14/92
5,104,166                   07/604,198                   04/14/92
5,104,171                   07/714,206                   04/14/92
5,104,172                   07/729,151                   04/14/92
5,104,177                   07/633,383                   04/14/92
5,104,178                   07/692,247                   04/14/92
5,104,179                   07/561,115                   04/14/92
5,104,180                   07/409,831                   04/14/92
5,104,182                   07/745,060                   04/14/92
5,104,184                   07/699,547                   04/14/92
5,104,186                   07/700,532                   04/14/92
5,104,189                   07/610,713                   04/14/92
5,104,192                   07/641,708                   04/14/92
5,104,197                   07/527,764                   04/14/92
5,104,201                   07/590,021                   04/14/92
5,104,206                   07/680,975                   04/14/92
5,104,207                   07/582,153                   04/14/92
5,104,212                   07/431,489                   04/14/92
5,104,213                   07/462,767                   04/14/92
5,104,223                   07/474,941                   04/14/92
5,104,230                   07/547,427                   04/14/92
5,104,231                   07/736,177                   04/14/92
5,104,235                   07/625,198                   04/14/92
5,104,240                   07/675,520                   04/14/92
5,104,245                   07/458,445                   04/14/92
5,104,249                   07/459,691                   04/14/92
5,104,250                   07/674,187                   04/14/92
5,104,253                   07/723,667                   04/14/92
5,104,257                   07/530,885                   04/14/92
5,104,261                   07/615,467                   04/14/92
5,104,262                   07/543,977                   04/14/92
5,104,274                   07/608,445                   04/14/92
5,104,279                   07/585,894                   04/14/92
5,104,287                   07/405,369                   04/14/92
5,104,291                   07/600,673                   04/14/92
5,104,297                   07/621,896                   04/14/92
5,104,301                   07/661,365                   04/14/92
5,104,302                   07/649,893                   04/14/92
5,104,304                   07/542,979                   04/14/92
5,104,309                   07/459,769                   04/14/92
5,104,325                   07/646,421                   04/14/92
5,104,327                   07/662,058                   04/14/92
5,104,328                   07/510,530                   04/14/92
5,104,335                   07/665,018                   04/14/92
5,104,337                   07/657,913                   04/14/92
5,104,338                   07/652,971                   04/14/92
5,104,339                   07/595,832                   04/14/92
5,104,342                   07/686,520                   04/14/92
5,104,345                   07/491,081                   04/14/92
5,104,348                   07/773,032                   04/14/92
5,104,352                   07/623,445                   04/14/92
5,104,356                   07/490,449                   04/14/92
5,104,362                   07/483,270                   04/14/92
5,104,364                   07/634,322                   04/14/92
5,104,368                   07/513,502                   04/14/92
5,104,385                   07/711,652                   04/14/92
5,104,394                   07/609,363                   04/14/92
5,104,397                   07/338,801                   04/14/92
5,104,402                   07/496,343                   04/14/92
5,104,405                   07/659,789                   04/14/92
5,104,408                   07/468,768                   04/14/92
5,104,417                   07/552,218                   04/14/92
5,104,421                   07/613,359                   04/14/92
5,104,423                   07/428,246                   04/14/92
5,104,426                   07/608,350                   04/14/92
5,104,427                   07/786,382                   04/14/92
5,104,428                   07/722,471                   04/14/92
5,104,430                   07/712,488                   04/14/92
5,104,452                   07/665,254                   04/14/92
5,104,460                   07/628,955                   04/14/92
5,104,463                   07/594,538                   04/14/92
5,104,473                   07/592,939                   04/14/92
5,104,474                   07/564,663                   04/14/92
5,104,476                   07/496,715                   04/14/92
5,104,478                   07/422,705                   04/14/92
5,104,481                   07/613,964                   04/14/92
5,104,487                   07/568,396                   04/14/92
5,104,489                   07/701,520                   04/14/92
5,104,490                   07/262,126                   04/14/92
5,104,493                   07/645,434                   04/14/92
5,104,497                   07/634,788                   04/14/92
5,104,501                   07/535,387                   04/14/92
5,104,504                   07/588,095                   04/14/92
5,104,517                   07/524,525                   04/14/92
5,104,518                   07/489,048                   04/14/92
5,104,520                   07/542,604                   04/14/92
5,104,525                   07/698,790                   04/14/92
5,104,534                   07/718,295                   04/14/92
5,104,542                   07/650,676                   04/14/92
5,104,557                   07/546,478                   04/14/92
5,104,558                   07/577,011                   04/14/92
5,104,559                   07/617,748                   04/14/92
5,104,568                   07/616,278                   04/14/92
5,104,570                   07/457,122                   04/14/92
5,104,578                   07/733,482                   04/14/92
5,104,579                   07/211,482                   04/14/92
5,104,580                   07/225,164                   04/14/92
5,104,581                   07/415,781                   04/14/92
5,104,582                   07/420,283                   04/14/92
5,104,583                   07/520,284                   04/14/92
5,104,584                   07/542,240                   04/14/92
5,104,585                   07/635,171                   04/14/92
5,104,589                   07/668,183                   04/14/92
5,104,602                   07/450,964                   04/14/92
5,104,606                   07/615,966                   04/14/92
5,104,607                   07/652,387                   04/14/92
5,104,608                   07/743,925                   04/14/92
5,104,613                   07/556,633                   04/14/92
5,104,620                   07/559,660                   04/14/92
5,104,624                   07/682,878                   04/14/92
5,104,637                   06/698,565                   04/14/92
5,104,642                   07/506,409                   04/14/92
5,104,657                   07/620,763                   04/14/92
5,104,663                   07/577,306                   04/14/92
5,104,667                   07/645,429                   04/14/92
5,104,669                   07/730,580                   04/14/92
5,104,676                   07/722,436                   04/14/92
5,104,679                   07/378,090                   04/14/92
5,104,680                   07/521,800                   04/14/92
5,104,682                   07/390,408                   04/14/92
5,104,683                   07/693,049                   04/14/92
5,104,686                   07/596,815                   04/14/92
5,104,692                   07/516,510                   04/14/92
5,104,695                   07/404,803                   04/14/92
5,104,699                   07/610,504                   04/14/92
5,104,700                   06/881,576                   04/14/92
5,104,707                   07/534,716                   04/14/92
5,104,708                   07/497,892                   04/14/92
5,104,727                   07/537,184                   04/14/92
5,104,734                   07/201,989                   04/14/92
5,104,745                   07/549,197                   04/14/92
5,104,747                   07/592,529                   04/14/92
5,104,749                   07/527,366                   04/14/92
5,104,750                   07/501,719                   04/14/92
5,104,752                   07/597,911                   04/14/92
5,104,754                   07/594,489                   04/14/92
5,104,764                   07/443,578                   04/14/92
5,104,771                   07/562,910                   04/14/92
5,104,794                   07/492,572                   04/14/92
5,104,805                   07/259,175                   04/14/92
5,104,809                   07/651,159                   04/14/92
5,104,823                   07/342,511                   04/14/92
5,104,827                   07/721,950                   04/14/92
5,104,832                   07/642,853                   04/14/92
5,104,835                   07/591,623                   04/14/92
5,104,845                   07/247,614                   04/14/92
5,104,848                   07/338,922                   04/14/92
5,104,851                   07/646,450                   04/14/92
5,104,856                   07/611,255                   04/14/92
5,104,865                   07/403,054                   04/14/92
5,104,872                   07/567,525                   04/14/92
5,104,874                   07/627,149                   04/14/92
5,104,877                   07/661,563                   04/14/92
5,104,881                   06/595,010                   04/14/92
5,104,883                   07/461,547                   04/14/92
5,104,884                   07/219,903                   04/14/92
5,104,886                   07/545,026                   04/14/92
5,104,890                   07/490,375                   04/14/92
5,104,891                   07/449,700                   04/14/92
5,104,902                   07/439,973                   04/14/92
5,104,914                   07/523,579                   04/14/92
5,104,925                   07/406,499                   04/14/92
5,104,927                   07/732,174                   04/14/92
5,104,928                   07/464,210                   04/14/92
5,104,930                   07/660,770                   04/14/92
5,104,936                   07/507,738                   04/14/92
5,104,944                   07/381,627                   04/14/92
5,104,948                   07/644,838                   04/14/92
5,104,950                   07/628,038                   04/14/92
5,104,951                   07/707,305                   04/14/92
5,104,954                   07/620,223                   04/14/92
5,104,956                   07/452,721                   04/14/92
5,104,959                   07/536,140                   04/14/92
5,104,961                   07/630,176                   04/14/92
5,104,962                   07/601,425                   04/14/92
5,104,966                   07/365,395                   04/14/92
5,104,967                   07/181,013                   04/14/92
5,104,968                   07/564,236                   04/14/92
5,104,970                   07/630,730                   04/14/92
5,104,979                   07/559,996                   04/14/92
5,104,981                   07/494,360                   04/14/92
5,104,989                   07/520,945                   04/14/92
5,104,997                   07/630,721                   04/14/92
5,104,998                   07/703,618                   04/14/92
5,105,007                   07/721,742                   04/14/92
5,105,010                   07/714,808                   04/14/92
5,105,013                   07/286,419                   04/14/92
5,105,014                   07/741,012                   04/14/92
5,105,016                   07/613,748                   04/14/92
5,105,020                   07/454,974                   04/14/92
5,105,027                   07/661,817                   04/14/92
5,105,033                   07/738,679                   04/14/92
5,105,035                   07/706,836                   04/14/92
5,105,037                   07/522,941                   04/14/92
5,105,040                   07/150,076                   04/14/92
5,105,043                   07/150,026                   04/14/92
5,105,046                   07/626,448                   04/14/92
5,105,047                   07/388,402                   04/14/92
5,105,055                   07/598,948                   04/14/92
5,105,057                   07/702,512                   04/14/92
5,105,061                   07/655,984                   04/14/92
5,105,067                   07/405,626                   04/14/92
5,105,069                   07/335,067                   04/14/92
5,105,072                   07/665,896                   04/14/92
5,105,074                   07/534,483                   04/14/92
5,105,078                   07/655,523                   04/14/92
5,105,084                   07/581,255                   04/14/92
5,105,086                   07/606,934                   04/14/92
5,105,091                   07/538,342                   04/14/92
5,105,093                   07/628,520                   04/14/92
5,105,095                   07/723,732                   04/14/92
5,105,096                   07/353,265                   04/14/92
5,105,103                   07/430,668                   04/14/92
5,105,104                   07/508,443                   04/14/92
5,105,109                   07/442,883                   04/14/92
5,105,112                   07/550,132                   04/14/92
5,105,116                   07/530,685                   04/14/92
5,105,123                   07/596,417                   04/14/92
5,105,129                   07/644,652                   04/14/92
5,105,131                   07/587,278                   04/14/92
5,105,132                   07/603,876                   04/14/92
5,105,134                   07/655,589                   04/14/92
5,105,135                   07/608,977                   04/14/92
5,105,136                   07/465,115                   04/14/92
5,105,139                   07/537,631                   04/14/92
5,105,142                   07/384,686                   04/14/92
5,105,160                   07/494,034                   04/14/92
5,105,161                   07/558,320                   04/14/92
5,105,166                   07/677,365                   04/14/92
5,105,177                   07/444,931                   04/14/92
5,105,181                   07/568,713                   04/14/92
5,105,185                   07/551,701                   04/14/92
5,105,189                   07/553,603                   04/14/92
5,105,209                   07/664,280                   04/14/92
5,105,222                   07/645,795                   04/14/92
5,105,231                   07/297,312                   04/14/92
5,105,232                   07/680,623                   04/14/92
5,105,234                   07/651,032                   04/14/92
5,105,238                   07/589,940                   04/14/92
5,105,242                   07/732,437                   04/14/92
5,105,246                   07/566,015                   04/14/92
5,105,263                   07/500,205                   04/14/92
5,105,270                   07/499,820                   04/14/92
5,105,272                   07/474,102                   04/14/92
5,105,274                   07/577,608                   04/14/92
5,105,290                   07/491,418                   04/14/92
5,105,301                   07/450,621                   04/14/92
5,105,307                   07/431,180                   04/14/92
5,105,315                   07/105,441                   04/14/92
5,105,318                   07/243,595                   04/14/92
5,105,319                   07/528,100                   04/14/92
5,105,320                   07/321,860                   04/14/92
5,105,328                   07/449,634                   04/14/92
5,105,340                   07/603,213                   04/14/92
5,105,342                   07/740,329                   04/14/92
5,105,343                   07/687,969                   04/14/92
5,105,352                   07/606,787                   04/14/92
5,105,353                   07/393,812                   04/14/92
5,105,364                   07/377,548                   04/14/92
5,105,388                   07/632,652                   04/14/92
5,105,391                   07/606,251                   04/14/92
5,105,394                   07/227,976                   04/14/92
5,105,398                   07/689,719                   04/14/92
5,105,399                   07/581,184                   04/14/92
5,105,402                   07/408,242                   04/14/92
5,105,409                   07/230,971                   04/14/92
5,105,417                   07/620,762                   04/14/92
5,105,418                   07/263,465                   04/14/92
5,105,426                   07/457,792                   04/14/92
5,105,430                   07/682,770                   04/14/92
5,105,434                   07/698,038                   04/14/92
5,105,436                   07/554,537                   04/14/92
5,105,452                   07/674,913                   04/14/92
5,105,453                   07/618,958                   04/14/92
5,105,454                   07/619,002                   04/14/92
5,105,456                   07/649,614                   04/14/92
5,105,457                   07/511,045                   04/14/92

                    PATENTS WHICH EXPIRED ON April 16, 2000
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

5,507,041                   08/269,772                   04/16/96
5,507,046                   08/386,283                   04/16/96
5,507,048                   08/486,326                   04/16/96
5,507,049                   08/285,100                   04/16/96
5,507,052                   08/386,115                   04/16/96
5,507,059                   08/497,793                   04/16/96
5,507,060                   08/344,024                   04/16/96
5,507,061                   08/315,661                   04/16/96
5,507,066                   08/287,085                   04/16/96
5,507,068                   08/264,352                   04/16/96
5,507,069                   08/230,168                   04/16/96
5,507,073                   08/204,222                   04/16/96
5,507,078                   08/335,473                   04/16/96
5,507,084                   08/358,238                   04/16/96
5,507,090                   08/278,028                   04/16/96
5,507,098                   08/344,974                   04/16/96
5,507,103                   08/375,168                   04/16/96
5,507,105                   08/408,531                   04/16/96
5,507,110                   08/339,860                   04/16/96
5,507,112                   08/316,840                   04/16/96
5,507,114                   08/238,516                   04/16/96
5,507,125                   08/261,187                   04/16/96
5,507,127                   08/332,930                   04/16/96
5,507,131                   08/349,541                   04/16/96
5,507,139                   08/423,413                   04/16/96
5,507,142                   08/409,694                   04/16/96
5,507,147                   08/434,541                   04/16/96
5,507,155                   08/337,029                   04/16/96
5,507,156                   08/416,297                   04/16/96
5,507,158                   08/196,224                   04/16/96
5,507,160                   08/421,684                   04/16/96
5,507,161                   08/169,908                   04/16/96
5,507,166                   08/294,320                   04/16/96
5,507,173                   08/269,204                   04/16/96
5,507,181                   08/172,956                   04/16/96
5,507,184                   08/090,304                   04/16/96
5,507,192                   08/305,132                   04/16/96
5,507,196                   08/232,196                   04/16/96
5,507,197                   08/271,443                   04/16/96
5,507,202                   08/207,551                   04/16/96
5,507,205                   08/240,844                   04/16/96
5,507,207                   08/409,440                   04/16/96
5,507,210                   08/412,002                   04/16/96
5,507,212                   08/181,003                   04/16/96
5,507,220                   08/256,822                   04/16/96
5,507,221                   08/508,890                   04/16/96
5,507,222                   08/383,244                   04/16/96
5,507,224                   08/155,792                   04/16/96
5,507,227                   08/234,813                   04/16/96
5,507,228                   08/320,403                   04/16/96
5,507,245                   08/300,461                   04/16/96
5,507,249                   08/380,419                   04/16/96
5,507,260                   08/394,903                   04/16/96
5,507,266                   08/226,146                   04/16/96
5,507,267                   08/187,198                   04/16/96
5,507,272                   08/292,883                   04/16/96
5,507,276                   08/349,690                   04/16/96
5,507,283                   08/203,930                   04/16/96
5,507,284                   08/127,180                   04/16/96
5,507,285                   08/168,708                   04/16/96
5,507,289                   08/216,588                   04/16/96
5,507,299                   08/259,325                   04/16/96
5,507,305                   08/279,570                   04/16/96
5,507,311                   08/452,277                   04/16/96
5,507,329                   08/220,532                   04/16/96
5,507,333                   08/200,064                   04/16/96
5,507,334                   08/243,292                   04/16/96
5,507,335                   08/305,376                   04/16/96
5,507,345                   08/344,420                   04/16/96
5,507,346                   08/380,771                   04/16/96
5,507,348                   08/341,132                   04/16/96
5,507,354                   08/346,075                   04/16/96
5,507,358                   08/252,408                   04/16/96
5,507,360                   08/327,949                   04/16/96
5,507,364                   08/314,721                   04/16/96
5,507,365                   08/130,524                   04/16/96
5,507,366                   08/311,948                   04/16/96
5,507,369                   08/215,180                   04/16/96
5,507,370                   08/356,765                   04/16/96
5,507,373                   08/252,214                   04/16/96
5,507,375                   08/108,590                   04/16/96
5,507,377                   08/067,544                   04/16/96
5,507,378                   08/333,672                   04/16/96
5,507,386                   08/506,618                   04/16/96
5,507,388                   08/317,972                   04/16/96
5,507,391                   08/219,521                   04/16/96
5,507,396                   08/346,490                   04/16/96
5,507,398                   08/235,906                   04/16/96
5,507,399                   08/236,336                   04/16/96
5,507,404                   08/331,375                   04/16/96
5,507,419                   08/145,205                   04/16/96
5,507,421                   08/161,794                   04/16/96
5,507,422                   08/292,864                   04/16/96
5,507,444                   08/280,093                   04/16/96
5,507,446                   08/106,239                   04/16/96
5,507,450                   08/211,573                   04/16/96
5,507,453                   08/172,085                   04/16/96
5,507,458                   08/337,123                   04/16/96
5,507,462                   08/383,849                   04/16/96
5,507,465                   08/418,627                   04/16/96
5,507,476                   08/395,104                   04/16/96
5,507,487                   08/398,957                   04/16/96
5,507,491                   08/124,623                   04/16/96
5,507,492                   08/394,768                   04/16/96
5,507,494                   08/513,050                   04/16/96
5,507,495                   08/321,760                   04/16/96
5,507,496                   08/097,536                   04/16/96
5,507,497                   08/412,937                   04/16/96
5,507,502                   08/350,958                   04/16/96
5,507,506                   08/151,924                   04/16/96
5,507,508                   08/456,935                   04/16/96
5,507,511                   08/517,810                   04/16/96
5,507,513                   08/374,208                   04/16/96
5,507,514                   08/405,747                   04/16/96
5,507,515                   08/460,310                   04/16/96
5,507,529                   08/343,626                   04/16/96
5,507,535                   08/370,186                   04/16/96
5,507,538                   08/435,369                   04/16/96
5,507,540                   08/211,552                   04/16/96
5,507,541                   08/237,865                   04/16/96
5,507,544                   08/370,200                   04/16/96
5,507,549                   08/148,288                   04/16/96
5,507,553                   08/294,832                   04/16/96
5,507,556                   08/334,134                   04/16/96
5,507,557                   08/358,311                   04/16/96
5,507,558                   08/130,205                   04/16/96
5,507,559                   08/211,190                   04/16/96
5,507,562                   08/281,923                   04/16/96
5,507,566                   08/226,042                   04/16/96
5,507,573                   08/129,113                   04/16/96
5,507,577                   08/226,289                   04/16/96
5,507,591                   08/376,587                   04/16/96
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