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 22, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date
                                     
Re. 33,072                  07/219,699                   09/26/89
(4,584,131)                (06/746,904)                (04/22/86)
Re. 34,223                  07/857,086                   04/13/93
(4,917,669)                (07/308,137)                (04/17/90)
4,583,246                   06/562,792                   04/22/86
4,583,252                   06/705,814                   04/22/86
4,583,253                   06/701,989                   04/22/86
4,583,257                   06/701,832                   04/22/86
4,583,266                   06/774,852                   04/22/86
4,583,270                   06/485,368                   04/22/86
4,583,271                   06/489,646                   04/22/86
4,583,275                   06/770,972                   04/22/86
4,583,278                   06/686,277                   04/22/86
4,583,283                   06/693,695                   04/22/86
4,583,289                   06/687,621                   04/22/86
4,583,297                   06/678,520                   04/22/86
4,583,301                   06/618,802                   04/22/86
4,583,305                   06/711,218                   04/22/86
4,583,306                   06/662,500                   04/22/86
4,583,307                   06/593,122                   04/22/86
4,583,310                   06/603,390                   04/22/86
4,583,313                   06/607,788                   04/22/86
4,583,318                   06/493,263                   04/22/86
4,583,321                   06/599,704                   04/22/86
4,583,327                   06/555,275                   04/22/86
4,583,333                   06/448,634                   04/22/86
4,583,337                   06/737,610                   04/22/86
4,583,339                   06/449,027                   04/22/86
4,583,351                   06/591,732                   04/22/86
4,583,354                   06/692,512                   04/22/86
4,583,361                   06/557,556                   04/22/86
4,583,369                   06/732,297                   04/22/86
4,583,378                   06/708,942                   04/22/86
4,583,379                   06/661,241                   04/22/86
4,583,380                   06/765,484                   04/22/86
4,583,394                   06/638,421                   04/22/86
4,583,406                   06/615,194                   04/22/86
4,583,411                   06/583,930                   04/22/86
4,583,416                   06/495,418                   04/22/86
4,583,422                   06/420,695                   04/22/86
4,583,424                   06/587,510                   04/22/86
4,583,428                   06/547,900                   04/22/86
4,583,431                   06/438,684                   04/22/86
4,583,440                   06/699,941                   04/22/86
4,583,444                   06/558,134                   04/22/86
4,583,446                   06/706,927                   04/22/86
4,583,449                   06/605,111                   04/22/86
4,583,453                   06/588,524                   04/22/86
4,583,457                   06/703,927                   04/22/86
4,583,459                   06/612,042                   04/22/86
4,583,462                   06/514,051                   04/22/86
4,583,468                   06/518,219                   04/22/86
4,583,470                   06/689,210                   04/22/86
4,583,473                   06/674,020                   04/22/86
4,583,481                   06/660,736                   04/22/86
4,583,492                   06/562,625                   04/22/86
4,583,500                   06/695,225                   04/22/86
4,583,508                   06/689,359                   04/22/86
4,583,510                   06/689,126                   04/22/86
4,583,514                   06/568,164                   04/22/86
4,583,515                   06/705,411                   04/22/86
4,583,529                   06/496,838                   04/22/86
4,583,530                   06/605,823                   04/22/86
4,583,540                   06/249,331                   04/22/86
4,583,541                   06/607,639                   04/22/86
4,583,546                   06/553,291                   04/22/86
4,583,547                   06/517,810                   04/22/86
4,583,557                   06/608,026                   04/22/86
4,583,568                   06/671,659                   04/22/86
4,583,578                   06/713,994                   04/22/86
4,583,595                   06/684,422                   04/22/86
4,583,603                   06/758,258                   04/22/86
4,583,607                   06/618,275                   04/22/86
4,583,613                   06/583,027                   04/22/86
4,583,615                   06/582,770                   04/22/86
4,583,622                   06/670,299                   04/22/86
4,583,623                   06/662,107                   04/22/86
4,583,625                   06/655,615                   04/22/86
4,583,628                   06/566,491                   04/22/86
4,583,641                   06/652,579                   04/22/86
4,583,650                   06/710,462                   04/22/86
4,583,651                   06/716,261                   04/22/86
4,583,659                   06/494,814                   04/22/86
4,583,693                   06/651,521                   04/22/86
4,583,698                   06/610,088                   04/22/86
4,583,699                   06/601,196                   04/22/86
4,583,704                   06/565,433                   04/22/86
4,583,706                   06/396,873                   04/22/86
4,583,710                   06/376,811                   04/22/86
4,583,714                   06/462,647                   04/22/86
4,583,719                   06/600,487                   04/22/86
4,583,720                   06/664,389                   04/22/86
4,583,728                   06/646,694                   04/22/86
4,583,748                   06/634,083                   04/22/86
4,583,754                   06/656,923                   04/22/86
4,583,761                   06/669,231                   04/22/86
4,583,764                   06/607,942                   04/22/86
4,583,768                   06/569,491                   04/22/86
4,583,770                   06/629,790                   04/22/86
4,583,774                   06/647,097                   04/22/86
4,583,789                   06/686,359                   04/22/86
4,583,791                   06/588,841                   04/22/86
4,583,796                   06/545,341                   04/22/86
4,583,800                   06/642,202                   04/22/86
4,583,815                   06/509,964                   04/22/86
4,583,817                   06/536,441                   04/22/86
4,583,821                   06/651,031                   04/22/86
4,583,835                   06/558,747                   04/22/86
4,583,838                   06/620,115                   04/22/86
4,583,842                   06/661,562                   04/22/86
4,583,846                   06/673,523                   04/22/86
4,583,848                   06/637,656                   04/22/86
4,583,850                   06/586,833                   04/22/86
4,583,855                   06/581,185                   04/22/86
4,583,859                   06/595,205                   04/22/86
4,583,862                   06/562,622                   04/22/86
4,583,865                   06/682,646                   04/22/86
4,583,870                   06/654,826                   04/22/86
4,583,886                   06/485,270                   04/22/86
4,583,894                   06/627,323                   04/22/86
4,583,900                   06/697,798                   04/22/86
4,583,901                   06/617,933                   04/22/86
4,583,907                   06/611,732                   04/22/86
4,583,912                   06/590,413                   04/22/86
4,583,920                   06/566,363                   04/22/86
4,583,940                   06/626,857                   04/22/86
4,583,950                   06/646,322                   04/22/86
4,583,967                   06/579,347                   04/22/86
4,583,975                   06/717,487                   04/22/86
4,583,982                   06/643,912                   04/22/86
4,583,983                   06/545,088                   04/22/86
4,583,984                   06/552,050                   04/22/86
4,584,000                   06/669,498                   04/22/86
4,584,002                   06/276,218                   04/22/86
4,584,004                   06/536,723                   04/22/86
4,584,014                   06/626,945                   04/22/86
4,584,018                   06/702,087                   04/22/86
4,584,020                   06/557,936                   04/22/86
4,584,024                   06/556,477                   04/22/86
4,584,025                   06/674,831                   04/22/86
4,584,035                   06/590,049                   04/22/86
4,584,041                   06/487,225                   04/22/86
4,584,049                   06/649,774                   04/22/86
4,584,051                   06/701,114                   04/22/86
4,584,053                   06/623,115                   04/22/86
4,584,063                   06/393,071                   04/22/86
4,584,067                   06/706,816                   04/22/86
4,584,073                   06/564,060                   04/22/86
4,584,075                   06/675,057                   04/22/86
4,584,076                   06/665,882                   04/22/86
4,584,077                   06/639,769                   04/22/86
4,584,082                   06/659,525                   04/22/86
4,584,091                   06/687,853                   04/22/86
4,584,092                   06/687,303                   04/22/86
4,584,096                   06/347,693                   04/22/86
4,584,100                   06/572,468                   04/22/86
4,584,102                   06/772,847                   04/22/86
4,584,103                   06/445,529                   04/22/86
4,584,105                   06/707,921                   04/22/86
4,584,106                   06/639,718                   04/22/86
4,584,133                   06/549,535                   04/22/86
4,584,136                   06/707,219                   04/22/86
4,584,137                   06/597,930                   04/22/86
4,584,143                   06/655,835                   04/22/86
4,584,144                   06/330,628                   04/22/86
4,584,151                   06/754,995                   04/22/86
4,584,154                   06/707,348                   04/22/86
4,584,156                   06/737,995                   04/22/86
4,584,158                   06/587,232                   04/22/86
4,584,159                   06/434,597                   04/22/86
4,584,160                   06/423,293                   04/22/86
4,584,164                   06/384,456                   04/22/86
4,584,170                   06/668,295                   04/22/86
4,584,171                   06/653,012                   04/22/86
4,584,175                   06/609,636                   04/22/86
4,584,178                   06/672,141                   04/22/86
4,584,179                   06/611,619                   04/22/86
4,584,180                   06/612,549                   04/22/86
4,584,183                   06/564,055                   04/22/86
4,584,185                   06/768,252                   04/22/86
4,584,193                   06/716,798                   04/22/86
4,584,196                   06/473,639                   04/22/86
4,584,204                   06/455,008                   04/22/86
4,584,206                   06/636,039                   04/22/86
4,584,218                   06/663,714                   04/22/86
4,584,248                   06/657,439                   04/22/86
4,584,249                   06/625,077                   04/22/86
4,584,253                   06/686,046                   04/22/86
4,584,255                   06/746,946                   04/22/86
4,584,261                   06/635,346                   04/22/86
4,584,268                   06/583,456                   04/22/86
4,584,272                   06/309,346                   04/22/86
4,584,274                   06/465,082                   04/22/86
4,584,275                   06/403,380                   04/22/86
4,584,279                   06/673,317                   04/22/86
4,584,280                   06/609,389                   04/22/86
4,584,285                   06/651,378                   04/22/86
4,584,290                   06/556,413                   04/22/86
4,584,292                   06/662,840                   04/22/86
4,584,297                   06/721,773                   04/22/86
4,584,304                   06/705,247                   04/22/86
4,584,322                   06/597,984                   04/22/86
4,584,324                   06/782,650                   04/22/86
4,584,332                   06/651,543                   04/22/86
4,584,338                   06/477,740                   04/22/86
4,584,342                   06/705,566                   04/22/86
4,584,352                   06/697,299                   04/22/86
4,584,364                   06/673,229                   04/22/86
4,584,366                   06/683,963                   04/22/86
4,584,393                   06/691,293                   04/22/86
4,584,400                   06/678,809                   04/22/86
4,584,402                   06/665,804                   04/22/86
4,584,403                   06/584,181                   04/22/86
4,584,410                   06/670,847                   04/22/86
4,584,413                   06/531,979                   04/22/86
4,584,414                   06/685,017                   04/22/86
4,584,415                   06/742,989                   04/22/86
4,584,418                   06/712,227                   04/22/86
4,584,427                   06/663,648                   04/22/86
4,584,430                   06/720,888                   04/22/86
4,584,454                   06/604,562                   04/22/86
4,584,462                   06/671,343                   04/22/86
4,584,464                   06/627,146                   04/22/86
4,584,465                   06/479,944                   04/22/86
4,584,466                   06/688,257                   04/22/86
4,584,468                   06/633,373                   04/22/86
4,584,473                   06/523,762                   04/22/86
4,584,475                   06/614,584                   04/22/86
4,584,485                   06/524,994                   04/22/86
4,584,490                   06/595,061                   04/22/86
4,584,495                   06/682,659                   04/22/86
4,584,500                   06/518,507                   04/22/86
4,584,505                   06/620,586                   04/22/86
4,584,506                   06/674,429                   04/22/86
4,584,509                   06/634,109                   04/22/86
4,584,511                   06/629,008                   04/22/86
4,584,522                   06/522,027                   04/22/86
4,584,523                   06/538,548                   04/22/86
4,584,524                   06/520,386                   04/22/86
4,584,526                   06/461,735                   04/22/86
4,584,530                   06/494,068                   04/22/86
4,584,534                   06/529,632                   04/22/86
4,584,535                   06/622,349                   04/22/86
4,584,537                   06/724,248                   04/22/86
4,584,539                   06/675,903                   04/22/86
4,584,543                   06/586,621                   04/22/86
4,584,548                   06/722,782                   04/22/86
4,584,552                   06/478,123                   04/22/86
4,584,561                   06/653,402                   04/22/86
4,584,562                   06/653,410                   04/22/86
4,584,563                   06/653,412                   04/22/86
4,584,564                   06/653,422                   04/22/86
4,584,568                   06/623,889                   04/22/86
4,584,574                   06/532,112                   04/22/86
4,584,576                   06/545,793                   04/22/86
4,584,584                   06/477,034                   04/22/86
4,584,586                   06/552,304                   04/22/86
4,584,589                   06/688,481                   04/22/86
4,584,598                   06/500,822                   04/22/86
4,584,599                   06/683,680                   04/22/86
4,584,602                   06/549,519                   04/22/86
4,584,609                   06/723,148                   04/22/86
4,584,612                   06/582,072                   04/22/86
4,584,614                   06/522,704                   04/22/86
4,584,619                   06/584,107                   04/22/86
4,584,622                   06/629,288                   04/22/86
4,584,633                   06/652,100                   04/22/86
4,584,635                   06/584,195                   04/22/86
4,584,647                   06/542,830                   04/22/86
4,584,648                   06/531,974                   04/22/86
4,584,651                   06/528,311                   04/22/86
4,584,654                   06/435,648                   04/22/86
4,584,657                   06/548,067                   04/22/86
4,584,658                   06/504,118                   04/22/86
4,584,659                   06/510,810                   04/22/86
4,584,664                   06/542,324                   04/22/86
4,584,684                   06/554,486                   04/22/86
4,584,686                   06/564,273                   04/22/86
4,584,690                   06/607,998                   04/22/86
4,584,696                   06/664,621                   04/22/86
4,584,700                   06/420,280                   04/22/86
4,584,701                   06/565,555                   04/22/86
4,584,702                   06/562,930                   04/22/86
4,584,703                   06/450,163                   04/22/86
4,584,714                   06/621,931                   04/22/86
4,584,716                   06/670,100                   04/22/86
4,584,718                   06/482,233                   04/22/86
4,916,755                   07/259,973                   04/17/90
4,916,756                   07/367,793                   04/17/90
4,916,757                   07/176,714                   04/17/90
4,916,761                   07/348,289                   04/17/90
4,916,765                   07/380,383                   04/17/90
4,916,766                   07/395,541                   04/17/90
4,916,767                   07/157,030                   04/17/90
4,916,768                   07/346,567                   04/17/90
4,916,769                   07/319,185                   04/17/90
4,916,774                   07/337,405                   04/17/90
4,916,780                   07/354,176                   04/17/90
4,916,781                   07/241,583                   04/17/90
4,916,785                   07/215,391                   04/17/90
4,916,792                   07/190,870                   04/17/90
4,916,795                   07/299,033                   04/17/90
4,916,798                   07/391,739                   04/17/90
4,916,801                   07/374,630                   04/17/90
4,916,805                   07/317,671                   04/17/90
4,916,807                   07/293,639                   04/17/90
4,916,815                   06/522,263                   04/17/90
4,916,821                   07/164,091                   04/17/90
4,916,822                   07/278,587                   04/17/90
4,916,823                   07/302,548                   04/17/90
4,916,831                   07/265,701                   04/17/90
4,916,835                   07/215,157                   04/17/90
4,916,836                   07/277,076                   04/17/90
4,916,839                   07/210,760                   04/17/90
4,916,840                   07/151,561                   04/17/90
4,916,849                   07/300,950                   04/17/90
4,916,860                   07/185,444                   04/17/90
4,916,862                   07/281,539                   04/17/90
4,916,873                   07/307,345                   04/17/90
4,916,874                   07/381,783                   04/17/90
4,916,890                   07/357,339                   04/17/90
4,916,894                   07/294,091                   04/17/90
4,916,897                   07/291,273                   04/17/90
4,916,902                   07/086,135                   04/17/90
4,916,909                   07/291,734                   04/17/90
4,916,911                   07/271,163                   04/17/90
4,916,913                   07/225,913                   04/17/90
4,916,916                   07/270,211                   04/17/90
4,916,917                   07/400,793                   04/17/90
4,916,919                   07/381,261                   04/17/90
4,916,926                   07/211,718                   04/17/90
4,916,929                   07/152,252                   04/17/90
4,916,939                   07/124,817                   04/17/90
4,916,941                   07/420,116                   04/17/90
4,916,943                   07/379,070                   04/17/90
4,916,950                   07/309,660                   04/17/90
4,916,951                   07/117,748                   04/17/90
4,916,970                   07/369,722                   04/17/90
4,916,973                   07/196,444                   04/17/90
4,916,974                   07/155,489                   04/17/90
4,916,980                   07/220,801                   04/17/90
4,916,983                   07/268,827                   04/17/90
4,916,985                   07/401,186                   04/17/90
4,916,988                   07/286,807                   04/17/90
4,916,991                   07/067,225                   04/17/90
4,916,992                   07/354,510                   04/17/90
4,916,994                   07/235,417                   04/17/90
4,917,000                   07/168,037                   04/17/90
4,917,001                   07/257,544                   04/17/90
4,917,004                   07/311,914                   04/17/90
4,917,007                   07/403,603                   04/17/90
4,917,024                   07/356,754                   04/17/90
4,917,026                   07/329,512                   04/17/90
4,917,030                   07/360,123                   04/17/90
4,917,034                   07/254,692                   04/17/90
4,917,035                   07/217,708                   04/17/90
4,917,036                   07/386,444                   04/17/90
4,917,040                   07/282,060                   04/17/90
4,917,042                   07/239,613                   04/17/90
4,917,048                   07/244,143                   04/17/90
4,917,051                   07/319,158                   04/17/90
4,917,062                   07/339,213                   04/17/90
4,917,063                   07/199,638                   04/17/90
4,917,069                   07/307,419                   04/17/90
4,917,070                   07/312,808                   04/17/90
4,917,077                   07/178,921                   04/17/90
4,917,079                   07/234,511                   04/17/90
4,917,081                   07/099,650                   04/17/90
4,917,087                   07/238,730                   04/17/90
4,917,100                   07/348,871                   04/17/90
4,917,101                   07/315,600                   04/17/90
4,917,129                   07/190,763                   04/17/90
4,917,141                   07/278,948                   04/17/90
4,917,145                   07/306,291                   04/17/90
4,917,146                   07/248,667                   04/17/90
4,917,147                   07/369,530                   04/17/90
4,917,148                   07/278,387                   04/17/90
4,917,153                   07/199,007                   04/17/90
4,917,158                   07/168,870                   04/17/90
4,917,161                   07/105,275                   04/17/90
4,917,162                   07/195,714                   04/17/90
4,917,168                   07/410,264                   04/17/90
4,917,169                   07/232,172                   04/17/90
4,917,170                   07/246,845                   04/17/90
4,917,171                   06/728,193                   04/17/90
4,917,172                   07/184,231                   04/17/90
4,917,180                   07/329,172                   04/17/90
4,917,181                   07/228,340                   04/17/90
4,917,184                   07/310,439                   04/17/90
4,917,192                   07/230,611                   04/17/90
4,917,193                   07/208,878                   04/17/90
4,917,194                   07/324,566                   04/17/90
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