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 main-
tenance 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 ap-
plicable surcharge.

                     PATENTS WHICH EXPIRED April 15, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number                 Issue Date

4,581,771                   06/587,075                     04/15/86
4,581,772                   06/594,257                     04/15/86
4,581,782                   06/577,547                     04/15/86
4,581,783                   06/691,383                     04/15/86
4,581,792                   06/467,683                     04/15/86
4,581,801                   06/559,847                     04/15/86
4,581,808                   06/345,752                     04/15/86
4,581,810                   06/574,263                     04/15/86
4,581,811                   06/713,074                     04/15/86
4,581,816                   06/605,020                     04/15/86
4,581,820                   06/500,659                     04/15/86
4,581,822                   06/681,482                     04/15/86
4,581,827                   06/680,919                     04/15/86
4,581,836                   06/516,834                     04/15/86
4,581,842                   06/705,477                     04/15/86
4,581,848                   06/718,202                     04/15/86
4,581,855                   06/694,633                     04/15/86
4,581,877                   06/732,620                     04/15/86
4,581,896                   06/621,904                     04/15/86
4,581,901                   06/628,156                     04/15/86
4,581,912                   06/739,038                     04/15/86
4,581,915                   06/635,160                     04/15/86
4,581,917                   06/590,459                     04/15/86
4,581,918                   06/569,154                     04/15/86
4,581,923                   06/633,328                     04/15/86
4,581,926                   06/671,657                     04/15/86
4,581,930                   06/645,746                     04/15/86
4,581,939                   06/620,021                     04/15/86
4,581,954                   06/623,898                     04/15/86
4,581,964                   06/704,474                     04/15/86
4,581,981                   06/451,636                     04/15/86
4,581,982                   06/382,283                     04/15/86
4,581,987                   06/739,205                     04/15/86
4,581,994                   06/629,637                     04/15/86
4,582,002                   06/703,715                     04/15/86
4,582,007                   06/706,995                     04/15/86
4,582,029                   06/530,740                     04/15/86
4,582,032                   06/657,818                     04/15/86
4,582,033                   06/713,265                     04/15/86
4,582,038                   06/699,884                     04/15/86
4,582,042                   06/357,523                     04/15/86
4,582,049                   06/531,256                     04/15/86
4,582,051                   06/578,125                     04/15/86
4,582,054                   06/616,486                     04/15/86
4,582,060                   06/673,277                     04/15/86
4,582,068                   06/637,461                     04/15/86
4,582,080                   06/636,861                     04/15/86
4,582,081                   06/684,782                     04/15/86
4,582,086                   06/602,855                     04/15/86
4,582,088                   06/653,646                     04/15/86
4,582,101                   06/592,090                     04/15/86
4,582,110                   06/580,147                     04/15/86
4,582,117                   06/534,577                     04/15/86
4,582,127                   06/562,220                     04/15/86
4,582,135                   06/467,657                     04/15/86
4,582,136                   06/672,516                     04/15/86
4,582,140                   06/650,313                     04/15/86
4,582,156                   06/640,968                     04/15/86
4,582,162                   06/681,050                     04/15/86
4,582,169                   06/654,978                     04/15/86
4,582,174                   06/649,460                     04/15/86
4,582,177                   06/611,810                     04/15/86
4,582,180                   06/440,176                     04/15/86
4,582,183                   06/499,722                     04/15/86
4,582,184                   06/596,178                     04/15/86
4,582,198                   06/703,232                     04/15/86
4,582,200                   06/600,379                     04/15/86
4,582,201                   06/585,581                     04/15/86
4,582,202                   06/698,255                     04/15/86
4,582,204                   06/510,113                     04/15/86
4,582,205                   06/736,391                     04/15/86
4,582,213                   06/670,892                     04/15/86
4,582,215                   06/690,560                     04/15/86
4,582,220                   06/747,457                     04/15/86
4,582,221                   06/598,493                     04/15/86
4,582,224                   06/643,561                     04/15/86
4,582,228                   06/634,288                     04/15/86
4,582,240                   06/578,008                     04/15/86
4,582,252                   06/718,223                     04/15/86
4,582,254                   06/617,911                     04/15/86
4,582,260                   06/551,947                     04/15/86
4,582,266                   06/688,267                     04/15/86
4,582,274                   06/609,780                     04/15/86
4,582,275                   06/606,620                     04/15/86
4,582,279                   06/570,339                     04/15/86
4,582,281                   06/501,203                     04/15/86
4,582,282                   06/525,153                     04/15/86
4,582,285                   06/700,542                     04/15/86
4,582,291                   06/694,901                     04/15/86
4,582,292                   06/505,373                     04/15/86
4,582,316                   06/623,314                     04/15/86
4,582,320                   06/652,943                     04/15/86
4,582,324                   06/567,910                     04/15/86
4,582,325                   06/609,223                     04/15/86
4,582,326                   06/697,836                     04/15/86
4,582,334                   06/541,132                     04/15/86
4,582,336                   06/576,122                     04/15/86
4,582,340                   06/579,812                     04/15/86
4,582,349                   06/384,839                     04/15/86
4,582,352                   06/676,397                     04/15/86
4,582,357                   06/512,019                     04/15/86
4,582,358                   06/596,158                     04/15/86
4,582,361                   06/556,483                     04/15/86
4,582,365                   06/631,629                     04/15/86
4,582,380                   06/528,761                     04/15/86
4,582,388                   06/485,612                     04/15/86
4,582,399                   06/525,823                     04/15/86
4,582,405                   06/644,796                     04/15/86
4,582,414                   06/605,963                     04/15/86
4,582,420                   06/539,185                     04/15/86
4,582,421                   06/684,771                     04/15/86
4,582,431                   06/540,245                     04/15/86
4,582,434                   06/602,844                     04/15/86
4,582,435                   06/541,735                     04/15/86
4,582,438                   06/585,343                     04/15/86
4,582,443                   06/461,482                     04/15/86
4,582,447                   06/506,039                     04/15/86
4,582,451                   06/600,499                     04/15/86
4,582,452                   06/616,375                     04/15/86
4,582,453                   06/641,157                     04/15/86
4,582,454                   06/566,729                     04/15/86
4,582,456                   06/578,614                     04/15/86
4,582,458                   06/639,227                     04/15/86
4,582,468                   06/677,239                     04/15/86
4,582,475                   06/446,796                     04/15/86
4,582,482                   06/638,612                     04/15/86
4,582,508                   06/655,367                     04/15/86
4,582,509                   06/698,147                     04/15/86
4,582,510                   06/664,851                     04/15/86
4,582,512                   06/622,604                     04/15/86
4,582,519                   06/638,580                     04/15/86
4,582,522                   06/715,567                     04/15/86
4,582,523                   06/678,930                     04/15/86
4,582,534                   06/532,281                     04/15/86
4,582,536                   06/679,423                     04/15/86
4,582,540                   06/691,530                     04/15/86
4,582,544                   06/595,445                     04/15/86
4,582,547                   06/607,889                     04/15/86
4,582,552                   06/653,225                     04/15/86
4,582,561                   06/369,911                     04/15/86
4,582,578                   06/762,111                     04/15/86
4,582,582                   06/660,242                     04/15/86
4,582,586                   06/761,690                     04/15/86
4,582,600                   06/661,566                     04/15/86
4,582,601                   06/594,669                     04/15/86
4,582,605                   06/607,435                     04/15/86
4,582,611                   06/639,247                     04/15/86
4,582,625                   06/558,295                     04/15/86
4,582,628                   06/736,876                     04/15/86
4,582,631                   06/526,834                     04/15/86
4,582,634                   06/656,662                     04/15/86
4,582,636                   06/682,972                     04/15/86
4,582,638                   06/248,195                     04/15/86
4,582,639                   06/621,641                     04/15/86
4,582,653                   06/706,847                     04/15/86
4,582,655                   06/554,864                     04/15/86
4,582,658                   06/633,737                     04/15/86
4,582,659                   06/692,089                     04/15/86
4,582,674                   06/343,827                     04/15/86
4,582,676                   06/468,743                     04/15/86
4,582,678                   06/653,011                     04/15/86
4,582,682                   06/636,371                     04/15/86
4,582,685                   06/691,953                     04/15/86
4,582,687                   06/396,881                     04/15/86
4,582,697                   06/624,669                     04/15/86
4,582,698                   06/533,332                     04/15/86
4,582,699                   06/333,713                     04/15/86
4,582,703                   06/552,052                     04/15/86
4,582,704                   06/539,907                     04/15/86
4,582,706                   06/678,577                     04/15/86
4,582,709                   06/699,692                     04/15/86
4,582,710                   06/709,607                     04/15/86
4,582,712                   06/667,185                     04/15/86
4,582,721                   06/701,645                     04/15/86
4,582,722                   06/666,954                     04/15/86
4,582,726                   06/561,477                     04/15/86
4,582,728                   06/523,440                     04/15/86
4,582,730                   06/695,302                     04/15/86
4,582,752                   06/753,849                     04/15/86
4,582,759                   06/667,512                     04/15/86
4,582,767                   06/709,174                     04/15/86
4,582,776                   06/425,397                     04/15/86
4,582,781                   06/636,764                     04/15/86
4,582,787                   06/454,880                     04/15/86
4,582,801                   06/438,930                     04/15/86
4,582,806                   06/627,320                     04/15/86
4,582,810                   06/537,737                     04/15/86
4,582,816                   06/704,107                     04/15/86
4,582,817                   06/586,585                     04/15/86
4,582,820                   06/452,493                     04/15/86
4,582,821                   06/552,255                     04/15/86
4,582,826                   06/634,802                     04/15/86
4,582,842                   06/536,104                     04/15/86
4,582,847                   06/504,049                     04/15/86
4,582,851                   06/689,058                     04/15/86
4,582,853                   06/693,448                     04/15/86
4,582,858                   06/742,634                     04/15/86
4,582,860                   06/561,716                     04/15/86
4,582,870                   06/689,277                     04/15/86
4,582,877                   06/635,038                     04/15/86
4,582,884                   06/646,069                     04/15/86
4,582,887                   06/645,599                     04/15/86
4,582,891                   06/699,058                     04/15/86
4,582,892                   06/737,955                     04/15/86
4,582,895                   06/677,935                     04/15/86
4,582,897                   06/605,989                     04/15/86
4,582,900                   06/682,414                     04/15/86
4,582,902                   06/673,120                     04/15/86
4,582,908                   06/652,018                     04/15/86
4,582,922                   06/697,533                     04/15/86
4,582,923                   06/735,249                     04/15/86
4,582,924                   06/586,946                     04/15/86
4,582,925                   06/263,900                     04/15/86
4,582,929                   06/686,174                     04/15/86
4,582,935                   06/685,006                     04/15/86
4,582,937                   06/722,422                     04/15/86
4,582,938                   06/544,918                     04/15/86
4,582,940                   06/221,619                     04/15/86
4,582,946                   06/358,739                     04/15/86
4,582,955                   06/592,879                     04/15/86
4,582,965                   06/643,587                     04/15/86
4,582,966                   06/555,559                     04/15/86
4,582,968                   06/590,274                     04/15/86
4,582,970                   06/656,002                     04/15/86
4,582,971                   06/698,393                     04/15/86
4,582,981                   06/701,642                     04/15/86
4,582,991                   06/476,952                     04/15/86
4,582,993                   06/619,915                     04/15/86
4,582,994                   06/554,401                     04/15/86
4,583,009                   06/551,651                     04/15/86
4,583,011                   06/547,639                     04/15/86
4,583,031                   06/713,815                     04/15/86
4,583,040                   06/594,625                     04/15/86
4,583,046                   06/505,623                     04/15/86
4,583,050                   06/733,497                     04/15/86
4,583,051                   06/668,721                     04/15/86
4,583,052                   06/601,519                     04/15/86
4,583,053                   06/619,093                     04/15/86
4,583,056                   06/650,673                     04/15/86
4,583,057                   06/656,023                     04/15/86
4,583,059                   06/454,250                     04/15/86
4,583,063                   06/505,603                     04/15/86
4,583,069                   06/655,652                     04/15/86
4,583,070                   06/595,380                     04/15/86
4,583,081                   06/566,938                     04/15/86
4,583,083                   06/625,821                     04/15/86
4,583,088                   06/497,534                     04/15/86
4,583,093                   06/523,553                     04/15/86
4,583,098                   06/646,422                     04/15/86
4,583,106                   06/754,698                     04/15/86
4,583,110                   06/620,591                     04/15/86
4,583,112                   06/665,820                     04/15/86
4,583,117                   06/631,894                     04/15/86
4,583,118                   06/650,643                     04/15/86
4,583,122                   06/498,134                     04/15/86
4,583,123                   06/704,360                     04/15/86
4,583,126                   06/639,549                     04/15/86
4,583,134                   06/326,008                     04/15/86
4,583,141                   06/430,977                     04/15/86
4,583,147                   06/726,187                     04/15/86
4,583,149                   06/639,833                     04/15/86
4,583,152                   06/681,403                     04/15/86
4,583,159                   06/494,558                     04/15/86
4,583,165                   06/394,053                     04/15/86
4,583,175                   06/502,946                     04/15/86
4,583,184                   06/453,950                     04/15/86
4,583,188                   06/474,938                     04/15/86
4,583,193                   06/350,681                     04/15/86
4,583,197                   06/509,740                     04/15/86
4,583,201                   06/530,451                     04/15/86
4,583,208                   06/578,149                     04/15/86
4,583,214                   06/591,191                     04/15/86
4,583,217                   06/520,383                     04/15/86
4,583,220                   06/606,804                     04/15/86
4,583,221                   06/545,539                     04/15/86
4,583,223                   06/475,158                     04/15/86
4,583,230                   06/647,700                     04/15/86
4,583,235                   06/546,124                     04/15/86
4,583,243                   06/609,615                     04/15/86
4,914,752                   07/303,539                     04/10/90
4,914,757                   07/294,105                     04/10/90
4,914,765                   07/247,378                     04/10/90
4,914,768                   07/280,977                     04/10/90
4,914,770                   07/178,020                     04/10/90
4,914,776                   07/293,180                     04/10/90
4,914,779                   07/248,840                     04/10/90
4,914,780                   07/227,191                     04/10/90
4,914,786                   07/320,478                     04/10/90
4,914,792                   07/285,019                     04/10/90
4,914,793                   07/118,084                     04/10/90
4,914,798                   07/360,542                     04/10/90
4,914,800                   07/143,433                     04/10/90
4,914,807                   07/308,290                     04/10/90
4,914,810                   06/803,378                     04/10/90
4,914,816                   07/327,724                     04/10/90
4,914,818                   07/235,079                     04/10/90
4,914,820                   07/293,926                     04/10/90
4,914,830                   07/261,397                     04/10/90
4,914,832                   07/308,304                     04/10/90
4,914,836                   07/350,304                     04/10/90
4,914,838                   07/233,469                     04/10/90
4,914,839                   07/126,337                     04/10/90
4,914,847                   07/390,240                     04/10/90
4,914,857                   07/294,775                     04/10/90
4,914,858                   07/242,337                     04/10/90
4,914,859                   07/248,133                     04/10/90
4,914,862                   07/237,093                     04/10/90
4,914,863                   07/340,304                     04/10/90
4,914,864                   07/243,980                     04/10/90
4,914,865                   07/311,450                     04/10/90
4,914,871                   07/244,540                     04/10/90
4,914,875                   07/229,607                     04/10/90
4,914,880                   07/220,525                     04/10/90
4,914,881                   07/242,193                     04/10/90
4,914,882                   06/465,206                     04/10/90
4,914,884                   07/274,891                     04/10/90
4,914,885                   07/237,958                     04/10/90
4,914,886                   07/155,529                     04/10/90
4,914,895                   07/192,557                     04/10/90
4,914,898                   07/344,193                     04/10/90
4,914,911                   07/322,544                     04/10/90
4,914,916                   07/177,312                     04/10/90
4,914,917                   07/198,033                     04/10/90
4,914,919                   07/294,111                     04/10/90
4,914,921                   07/232,869                     04/10/90
4,914,924                   07/217,857                     04/10/90
4,914,927                   07/301,567                     04/10/90
4,914,929                   07/324,706                     04/10/90
4,914,933                   07/251,127                     04/10/90
4,914,943                   07/312,864                     04/10/90
4,914,948                   07/275,687                     04/10/90
4,914,949                   07/266,229                     04/10/90
4,914,952                   07/215,752                     04/10/90
4,914,954                   07/248,115                     04/10/90
4,914,966                   07/284,889                     04/10/90
4,914,973                   07/399,035                     04/10/90
4,914,974                   07/399,034                     04/10/90
4,914,975                   07/399,036                     04/10/90
4,914,986                   07/357,293                     04/10/90
4,914,991                   07/321,520                     04/10/90
4,914,996                   07/293,137                     04/10/90
4,915,011                   07/241,501                     04/10/90
4,915,013                   07/217,613                     04/10/90
4,915,017                   07/256,976                     04/10/90
4,915,019                   07/050,128                     04/10/90
4,915,025                   07/296,891                     04/10/90
4,915,029                   07/271,553                     04/10/90
4,915,030                   07/090,006                     04/10/90
4,915,033                   07/227,099                     04/10/90
4,915,037                   07/270,931                     04/10/90
4,915,050                   07/270,959                     04/10/90
4,915,057                   06/930,844                     04/10/90
4,915,060                   07/247,701                     04/10/90
4,915,062                   07/281,850                     04/10/90
4,915,072                   07/219,013                     04/10/90
4,915,076                   07/289,450                     04/10/90
4,915,089                   07/296,291                     04/10/90
4,915,090                   06/465,311                     04/10/90
4,915,091                   07/300,616                     04/10/90
4,915,093                   07/397,062                     04/10/90
4,915,097                   07/195,565                     04/10/90
4,915,101                   07/125,973                     04/10/90
4,915,104                   07/294,779                     04/10/90
4,915,107                   07/316,299                     04/10/90
4,915,108                   07/202,251                     04/10/90
4,915,111                   07/170,342                     04/10/90
4,915,113                   07/285,529                     04/10/90
4,915,116                   07/329,535                     04/10/90
4,915,117                   07/228,616                     04/10/90
4,915,119                   06/853,860                     04/10/90
4,915,121                   07/369,112                     04/10/90
4,915,122                   07/342,330                     04/10/90
4,915,127                   07/357,752                     04/10/90
4,915,130                   07/263,110                     04/10/90
4,915,137                   07/231,958                     04/10/90
4,915,138                   07/233,459                     04/10/90
4,915,139                   07/259,462                     04/10/90
4,915,141                   07/248,074                     04/10/90
4,915,142                   07/340,746                     04/10/90
4,915,144                   07/209,898                     04/10/90
4,915,148                   07/315,931                     04/10/90
4,915,156                   07/247,363                     04/10/90
4,915,160                   07/268,050                     04/10/90
4,915,164                   07/211,862                     04/10/90
4,915,167                   07/228,409                     04/10/90
4,915,170                   07/322,330                     04/10/90
4,915,172                   07/357,173                     04/10/90
4,915,182                   07/374,362                     04/10/90
4,915,188                   07/104,997                     04/10/90
4,915,194                   07/265,483                     04/10/90
4,915,219                   07/261,493                     04/10/90
4,915,220                   07/320,525                     04/10/90
4,915,222                   07/226,916                     04/10/90
4,915,224                   07/369,317                     04/10/90
4,915,230                   07/276,808                     04/10/90
4,915,231                   07/169,589                     04/10/90
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