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 May 27, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,624                  07/047,977                   03/15/88
(4,591,961)                (06/764,831)                (05/27/86)
Re. 32,912                  07/042,056                   04/25/89
(4,591,266)                (06/580,120)                (05/27/86)
4,590,622                   06/756,443                   05/27/86
4,590,627                   06/718,967                   05/27/86
4,590,630                   06/699,206                   05/27/86
4,590,632                   06/653,745                   05/27/86
4,590,633                   06/567,906                   05/27/86
4,590,635                   06/603,205                   05/27/86
4,590,636                   06/622,663                   05/27/86
4,590,638                   06/648,302                   05/27/86
4,590,639                   06/494,928                   05/27/86
4,590,672                   06/400,013                   05/27/86
4,590,673                   06/618,983                   05/27/86
4,590,674                   06/683,461                   05/27/86
4,590,675                   06/674,587                   05/27/86
4,590,678                   06/677,238                   05/27/86
4,590,681                   06/686,923                   05/27/86
4,590,692                   06/631,362                   05/27/86
4,590,699                   06/760,266                   05/27/86
4,590,711                   06/588,760                   05/27/86
4,590,713                   06/629,500                   05/27/86
4,590,716                   06/546,747                   05/27/86
4,590,726                   06/503,024                   05/27/86
4,590,729                   06/606,391                   05/27/86
4,590,732                   06/569,245                   05/27/86
4,590,737                   06/645,712                   05/27/86
4,590,743                   06/677,745                   05/27/86
4,590,747                   06/609,344                   05/27/86
4,590,752                   06/780,701                   05/27/86
4,590,766                   06/631,078                   05/27/86
4,590,780                   06/688,264                   05/27/86
4,590,786                   06/599,236                   05/27/86
4,590,788                   06/657,597                   05/27/86
4,590,789                   06/646,634                   05/27/86
4,590,795                   06/557,612                   05/27/86
4,590,796                   06/693,875                   05/27/86
4,590,803                   06/625,763                   05/27/86
4,590,805                   06/665,051                   05/27/86
4,590,815                   06/658,295                   05/27/86
4,590,820                   06/480,678                   05/27/86
4,590,825                   06/659,715                   05/27/86
4,590,826                   06/490,620                   05/27/86
4,590,827                   06/607,561                   05/27/86
4,590,828                   06/676,218                   05/27/86
4,590,829                   06/621,215                   05/27/86
4,590,837                   06/535,155                   05/27/86
4,590,840                   06/669,775                   05/27/86
4,590,841                   06/689,067                   05/27/86
4,590,842                   06/471,215                   05/27/86
4,590,846                   06/709,444                   05/27/86
4,590,847                   06/664,204                   05/27/86
4,590,853                   06/602,817                   05/27/86
4,590,855                   06/621,498                   05/27/86
4,590,860                   06/569,817                   05/27/86
4,590,865                   06/568,038                   05/27/86
4,590,867                   06/741,259                   05/27/86
4,590,868                   06/704,374                   05/27/86
4,590,875                   06/692,262                   05/27/86
4,590,879                   06/551,854                   05/27/86
4,590,880                   06/616,433                   05/27/86
4,590,881                   06/776,895                   05/27/86
4,590,888                   06/683,211                   05/27/86
4,590,889                   06/722,661                   05/27/86
4,590,891                   06/673,438                   05/27/86
4,590,892                   06/657,880                   05/27/86
4,590,893                   06/645,629                   05/27/86
4,590,895                   06/591,458                   05/27/86
4,590,896                   06/704,083                   05/27/86
4,590,897                   06/670,390                   05/27/86
4,590,900                   06/470,374                   05/27/86
4,590,906                   06/685,762                   05/27/86
4,590,912                   06/672,367                   05/27/86
4,590,913                   06/740,169                   05/27/86
4,590,914                   06/619,586                   05/27/86
4,590,918                   06/523,692                   05/27/86
4,590,922                   06/524,844                   05/27/86
4,590,932                   06/610,269                   05/27/86
4,590,933                   06/685,068                   05/27/86
4,590,953                   06/722,903                   05/27/86
4,590,963                   06/719,893                   05/27/86
4,590,964                   06/727,596                   05/27/86
4,590,967                   06/767,041                   05/27/86
4,590,970                   06/749,114                   05/27/86
4,590,973                   06/683,483                   05/27/86
4,590,978                   06/781,209                   05/27/86
4,590,980                   06/609,572                   05/27/86
4,590,981                   06/561,803                   05/27/86
4,590,985                   06/755,332                   05/27/86
4,590,987                   06/473,770                   05/27/86
4,590,988                   06/651,766                   05/27/86
4,590,994                   06/641,833                   05/27/86
4,591,008                   06/643,220                   05/27/86
4,591,010                   06/784,353                   05/27/86
4,591,022                   06/677,726                   05/27/86
4,591,023                   06/732,731                   05/27/86
4,591,024                   06/591,210                   05/27/86
4,591,026                   06/556,997                   05/27/86
4,591,027                   06/555,086                   05/27/86
4,591,028                   06/669,009                   05/27/86
4,591,029                   06/641,734                   05/27/86
4,591,040                   06/511,670                   05/27/86
4,591,044                   06/696,020                   05/27/86
4,591,047                   06/641,026                   05/27/86
4,591,048                   06/696,146                   05/27/86
4,591,062                   06/685,996                   05/27/86
4,591,069                   06/551,710                   05/27/86
4,591,073                   06/663,886                   05/27/86
4,591,074                   06/466,536                   05/27/86
4,591,084                   06/617,309                   05/27/86
4,591,089                   06/651,671                   05/27/86
4,591,092                   06/710,965                   05/27/86
4,591,098                   06/518,821                   05/27/86
4,591,102                   06/642,364                   05/27/86
4,591,103                   06/584,946                   05/27/86
4,591,109                   06/718,527                   05/27/86
4,591,114                   06/699,261                   05/27/86
4,591,116                   06/634,418                   05/27/86
4,591,128                   06/637,157                   05/27/86
4,591,132                   06/714,802                   05/27/86
4,591,133                   06/671,798                   05/27/86
4,591,134                   06/724,005                   05/27/86
4,591,135                   06/654,738                   05/27/86
4,591,138                   06/677,541                   05/27/86
4,591,139                   06/657,527                   05/27/86
4,591,141                   06/474,878                   05/27/86
4,591,142                   06/565,816                   05/27/86
4,591,161                   06/652,223                   05/27/86
4,591,183                   06/608,149                   05/27/86
4,591,197                   06/700,798                   05/27/86
4,591,198                   06/580,715                   05/27/86
4,591,203                   06/596,038                   05/27/86
4,591,204                   06/600,816                   05/27/86
4,591,216                   06/631,657                   05/27/86
4,591,217                   06/680,218                   05/27/86
4,591,218                   06/679,793                   05/27/86
4,591,219                   06/679,795                   05/27/86
4,591,220                   06/771,134                   05/27/86
4,591,222                   06/646,554                   05/27/86
4,591,226                   06/462,662                   05/27/86
4,591,232                   06/500,623                   05/27/86
4,591,248                   06/489,170                   05/27/86
4,591,249                   06/656,149                   05/27/86
4,591,252                   06/679,296                   05/27/86
4,591,260                   06/647,285                   05/27/86
4,591,261                   06/727,000                   05/27/86
4,591,265                   06/664,431                   05/27/86
4,591,286                   06/585,989                   05/27/86
4,591,288                   06/496,547                   05/27/86
4,591,295                   06/679,845                   05/27/86
4,591,296                   06/535,306                   05/27/86
4,591,305                   06/651,753                   05/27/86
4,591,310                   06/700,066                   05/27/86
4,591,312                   06/525,111                   05/27/86
4,591,320                   06/575,511                   05/27/86
4,591,323                   06/734,275                   05/27/86
4,591,324                   06/601,241                   05/27/86
4,591,333                   06/716,339                   05/27/86
4,591,336                   06/601,943                   05/27/86
4,591,346                   06/610,022                   05/27/86
4,591,349                   06/620,895                   05/27/86
4,591,360                   06/732,756                   05/27/86
4,591,361                   06/566,176                   05/27/86
4,591,367                   06/646,282                   05/27/86
4,591,381                   06/676,198                   05/27/86
4,591,387                   06/577,961                   05/27/86
4,591,389                   06/554,622                   05/27/86
4,591,396                   06/646,490                   05/27/86
4,591,400                   06/610,371                   05/27/86
4,591,404                   06/674,105                   05/27/86
4,591,409                   06/607,107                   05/27/86
4,591,410                   06/623,132                   05/27/86
4,591,411                   06/636,783                   05/27/86
4,591,427                   06/692,443                   05/27/86
4,591,429                   06/656,132                   05/27/86
4,591,434                   06/663,417                   05/27/86
4,591,435                   06/648,160                   05/27/86
4,591,439                   06/765,121                   05/27/86
4,591,441                   06/492,736                   05/27/86
4,591,442                   06/674,600                   05/27/86
4,591,448                   06/660,603                   05/27/86
4,591,449                   06/660,605                   05/27/86
4,591,453                   06/647,792                   05/27/86
4,591,457                   06/759,799                   05/27/86
4,591,458                   06/759,342                   05/27/86
4,591,464                   06/671,987                   05/27/86
4,591,466                   06/680,774                   05/27/86
4,591,467                   06/578,879                   05/27/86
4,591,469                   06/696,523                   05/27/86
4,591,471                   06/664,517                   05/27/86
4,591,472                   06/473,206                   05/27/86
4,591,477                   06/432,002                   05/27/86
4,591,478                   06/526,968                   05/27/86
4,591,480                   06/702,571                   05/27/86
4,591,483                   06/704,462                   05/27/86
4,591,490                   06/662,737                   05/27/86
4,591,501                   06/610,617                   05/27/86
4,591,506                   06/514,496                   05/27/86
4,591,513                   06/724,483                   05/27/86
4,591,517                   06/618,585                   05/27/86
4,591,520                   06/455,020                   05/27/86
4,591,526                   06/520,025                   05/27/86
4,591,527                   06/640,932                   05/27/86
4,591,545                   06/574,573                   05/27/86
4,591,548                   06/755,266                   05/27/86
4,591,551                   06/612,840                   05/27/86
4,591,554                   06/521,460                   05/27/86
4,591,557                   06/446,160                   05/27/86
4,591,558                   06/619,895                   05/27/86
4,591,561                   06/527,181                   05/27/86
4,591,569                   06/599,143                   05/27/86
4,591,571                   06/601,522                   05/27/86
4,591,583                   06/450,656                   05/27/86
4,591,584                   06/709,032                   05/27/86
4,591,588                   06/583,386                   05/27/86
4,591,593                   06/442,416                   05/27/86
4,591,595                   06/763,730                   05/27/86
4,591,599                   06/670,971                   05/27/86
4,591,603                   06/705,277                   05/27/86
4,591,609                   06/740,057                   05/27/86
4,591,628                   06/633,699                   05/27/86
4,591,632                   06/713,671                   05/27/86
4,591,646                   06/633,697                   05/27/86
4,591,649                   06/712,429                   05/27/86
4,591,654                   06/631,091                   05/27/86
4,591,666                   06/558,129                   05/27/86
4,591,667                   06/706,493                   05/27/86
4,591,678                   06/664,987                   05/27/86
4,591,683                   06/702,597                   05/27/86
4,591,705                   06/511,537                   05/27/86
4,591,706                   06/635,454                   05/27/86
4,591,709                   06/562,734                   05/27/86
4,591,720                   06/555,613                   05/27/86
4,591,723                   06/706,366                   05/27/86
4,591,726                   06/613,829                   05/27/86
4,591,727                   06/551,234                   05/27/86
4,591,729                   06/624,588                   05/27/86
4,591,730                   06/677,551                   05/27/86
4,591,732                   06/699,826                   05/27/86
4,591,740                   06/470,549                   05/27/86
4,591,749                   06/714,644                   05/27/86
4,591,751                   06/616,740                   05/27/86
4,591,752                   06/541,997                   05/27/86
4,591,754                   06/724,948                   05/27/86
4,591,757                   06/607,321                   05/27/86
4,591,758                   06/701,609                   05/27/86
4,591,761                   06/569,704                   05/27/86
4,591,767                   06/728,373                   05/27/86
4,591,768                   06/533,850                   05/27/86
4,591,770                   06/642,665                   05/27/86
4,591,788                   06/415,298                   05/27/86
4,591,797                   06/714,377                   05/27/86
4,591,804                   06/703,147                   05/27/86
4,591,805                   06/615,232                   05/27/86
4,591,807                   06/677,276                   05/27/86
4,591,808                   06/686,365                   05/27/86
4,591,813                   06/650,463                   05/27/86
4,591,833                   06/405,035                   05/27/86
4,591,842                   06/498,361                   05/27/86
4,591,846                   06/425,211                   05/27/86
4,591,855                   06/565,568                   05/27/86
4,591,860                   06/608,575                   05/27/86
4,591,863                   06/596,862                   05/27/86
4,591,865                   06/556,506                   05/27/86
4,591,893                   06/497,702                   05/27/86
4,591,926                   06/644,203                   05/27/86
4,591,929                   06/630,521                   05/27/86
4,591,930                   06/535,447                   05/27/86
4,591,934                   06/444,478                   05/27/86
4,591,939                   06/664,341                   05/27/86
4,591,954                   06/718,805                   05/27/86
4,591,965                   06/662,783                   05/27/86
4,591,967                   06/758,840                   05/27/86
4,591,991                   06/597,641                   05/27/86
4,591,995                   06/473,212                   05/27/86
4,591,996                   06/767,663                   05/27/86
4,592,009                   06/552,835                   05/27/86
4,592,018                   06/527,453                   05/27/86
4,592,034                   06/441,986                   05/27/86
4,592,041                   06/551,933                   05/27/86
4,592,045                   06/607,123                   05/27/86
4,592,047                   06/607,625                   05/27/86
4,592,049                   06/569,650                   05/27/86
4,592,057                   06/362,936                   05/27/86
4,592,061                   06/411,188                   05/27/86
4,592,081                   06/578,912                   05/27/86
4,592,082                   06/639,287                   05/27/86
4,592,083                   06/594,035                   05/27/86
4,592,088                   06/621,917                   05/27/86
4,592,094                   06/647,246                   05/27/86
4,926,506                   07/226,861                   05/22/90
4,926,509                   07/222,132                   05/22/90
4,926,512                   07/442,144                   05/22/90
4,926,514                   07/299,474                   05/22/90
4,926,518                   07/219,956                   05/22/90
4,926,523                   07/375,571                   05/22/90
4,926,526                   06/817,780                   05/22/90
4,926,530                   07/131,996                   05/22/90
4,926,531                   07/299,546                   05/22/90
4,926,533                   07/268,540                   05/22/90
4,926,541                   07/392,059                   05/22/90
4,926,546                   07/204,707                   05/22/90
4,926,548                   07/212,119                   05/22/90
4,926,553                   07/283,217                   05/22/90
4,926,558                   07/320,222                   05/22/90
4,926,562                   07/278,758                   05/22/90
4,926,570                   07/222,098                   05/22/90
4,926,571                   07/186,148                   05/22/90
4,926,583                   07/174,247                   05/22/90
4,926,588                   07/289,922                   05/22/90
4,926,590                   07/328,501                   05/22/90
4,926,591                   07/278,863                   05/22/90
4,926,597                   07/182,281                   05/22/90
4,926,605                   07/191,419                   05/22/90
4,926,609                   07/259,197                   05/22/90
4,926,610                   07/282,708                   05/22/90
4,926,612                   07/380,238                   05/22/90
4,926,617                   07/300,959                   05/22/90
4,926,618                   07/292,822                   05/22/90
4,926,627                   07/350,214                   05/22/90
4,926,634                   07/353,671                   05/22/90
4,926,636                   07/309,847                   05/22/90
4,926,639                   07/420,669                   05/22/90
4,926,641                   07/296,186                   05/22/90
4,926,642                   07/416,849                   05/22/90
4,926,643                   07/381,909                   05/22/90
4,926,654                   07/410,507                   05/22/90
4,926,655                   07/345,854                   05/22/90
4,926,657                   07/375,203                   05/22/90
4,926,660                   07/254,849                   05/22/90
4,926,670                   07/316,250                   05/22/90
4,926,677                   07/128,291                   05/22/90
4,926,679                   07/130,926                   05/22/90
4,926,684                   07/354,160                   05/22/90
4,926,686                   07/246,192                   05/22/90
4,926,688                   07/301,518                   05/22/90
4,926,690                   07/164,558                   05/22/90
4,926,691                   07/295,478                   05/22/90
4,926,694                   07/386,172                   05/22/90
4,926,697                   07/297,665                   05/22/90
4,926,703                   07/308,509                   05/22/90
4,926,705                   07/253,643                   05/22/90
4,926,728                   07/316,984                   05/22/90
4,926,731                   07/304,345                   05/22/90
4,926,732                   07/367,485                   05/22/90
4,926,733                   07/362,440                   05/22/90
4,926,743                   07/371,130                   05/22/90
4,926,749                   07/418,963                   05/22/90
4,926,758                   07/185,737                   05/22/90
4,926,761                   07/244,515                   05/22/90
4,926,763                   07/297,409                   05/22/90
4,926,766                   07/270,930                   05/22/90
4,926,770                   07/300,336                   05/22/90
4,926,771                   07/369,340                   05/22/90
4,926,780                   07/298,575                   05/22/90
4,926,781                   07/234,898                   05/22/90
4,926,785                   07/409,280                   05/22/90
4,926,792                   07/393,054                   05/22/90
4,926,794                   07/329,657                   05/22/90
4,926,797                   07/312,686                   05/22/90
4,926,799                   07/385,740                   05/22/90
4,926,800                   07/336,749                   05/22/90
4,926,816                   07/285,982                   05/22/90
4,926,818                   07/315,405                   05/22/90
4,926,820                   07/331,499                   05/22/90
4,926,832                   07/316,773                   05/22/90
4,926,833                   07/310,343                   05/22/90
4,926,836                   07/181,202                   05/22/90
4,926,844                   07/340,523                   05/22/90
4,926,845                   07/248,981                   05/22/90
4,926,846                   07/264,529                   05/22/90
4,926,859                   07/203,452                   05/22/90
4,926,866                   07/262,051                   05/22/90
4,926,867                   07/355,842                   05/22/90
4,926,874                   07/302,772                   05/22/90
4,926,882                   07/240,694                   05/22/90
4,926,884                   07/255,013                   05/22/90
4,926,887                   07/291,511                   05/22/90
4,926,890                   07/168,855                   05/22/90
4,926,896                   07/289,224                   05/22/90
4,926,910                   07/234,599                   05/22/90
4,926,915                   07/220,593                   05/22/90
4,926,916                   07/392,183                   05/22/90
4,926,921                   07/248,423                   05/22/90
4,926,928                   06/760,202                   05/22/90
4,926,929                   07/390,724                   05/22/90
4,926,931                   07/409,952                   05/22/90
4,926,938                   07/351,734                   05/22/90
4,926,943                   07/322,337                   05/22/90
4,926,950                   07/287,640                   05/22/90
4,926,955                   07/273,087                   05/22/90
4,926,965                   07/423,344                   05/22/90
4,926,967                   07/295,383                   05/22/90
4,926,980                   06/740,157                   05/22/90
4,926,981                   07/368,476                   05/22/90
4,926,989                   07/383,369                   05/22/90
4,927,014                   07/371,108                   05/22/90
4,927,018                   07/280,322                   05/22/90
4,927,019                   07/364,233                   05/22/90
4,927,023                   06/843,015                   05/22/90
4,927,024                   07/305,227                   05/22/90
4,927,026                   06/761,999                   05/22/90
4,927,030                   07/268,156                   05/22/90
4,927,031                   07/350,097                   05/22/90
4,927,039                   07/378,920                   05/22/90
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