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 29, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

4,584,732                   06/695,827                   04/29/86
4,584,738                   06/704,184                   04/29/86
4,584,740                   06/641,275                   04/29/86
4,584,741                   06/756,381                   04/29/86
4,584,745                   06/577,564                   04/29/86
4,584,748                   06/606,172                   04/29/86
4,584,751                   06/605,097                   04/29/86
4,584,757                   06/704,834                   04/29/86
4,584,758                   06/647,342                   04/29/86
4,584,762                   06/558,073                   04/29/86
4,584,763                   06/561,507                   04/29/86
4,584,766                   06/542,256                   04/29/86
4,584,772                   06/609,222                   04/29/86
4,584,773                   06/754,028                   04/29/86
4,584,777                   06/702,884                   04/29/86
4,584,786                   06/452,691                   04/29/86
4,584,797                   06/604,008                   04/29/86
4,584,798                   06/594,546                   04/29/86
4,584,803                   06/628,292                   04/29/86
4,584,804                   06/484,672                   04/29/86
4,584,815                   06/665,155                   04/29/86
4,584,816                   06/672,338                   04/29/86
4,584,818                   06/767,594                   04/29/86
4,584,831                   06/729,551                   04/29/86
4,584,843                   06/668,408                   04/29/86
4,584,852                   06/630,079                   04/29/86
4,584,855                   06/508,740                   04/29/86
4,584,868                   06/734,935                   04/29/86
4,584,879                   06/621,729                   04/29/86
4,584,883                   06/439,900                   04/29/86
4,584,885                   06/572,582                   04/29/86
4,584,888                   06/645,269                   04/29/86
4,584,894                   06/584,567                   04/29/86
4,584,904                   06/362,195                   04/29/86
4,584,910                   06/720,863                   04/29/86
4,584,916                   06/400,264                   04/29/86
4,584,923                   06/708,547                   04/29/86
4,584,925                   06/535,814                   04/29/86
4,584,942                   06/568,364                   04/29/86
4,584,948                   06/678,220                   04/29/86
4,584,955                   06/662,950                   04/29/86
4,584,957                   06/570,983                   04/29/86
4,584,958                   06/468,913                   04/29/86
4,584,960                   06/566,002                   04/29/86
4,584,968                   06/757,484                   04/29/86
4,584,969                   06/654,612                   04/29/86
4,584,971                   06/662,262                   04/29/86
4,584,973                   06/675,769                   04/29/86
4,584,974                   06/514,687                   04/29/86
4,584,981                   06/658,024                   04/29/86
4,584,988                   06/645,158                   04/29/86
4,584,990                   06/656,980                   04/29/86
4,584,994                   06/537,785                   04/29/86
4,584,999                   06/626,410                   04/29/86
4,585,007                   06/493,415                   04/29/86
4,585,010                   06/627,065                   04/29/86
4,585,011                   06/659,297                   04/29/86
4,585,017                   06/579,116                   04/29/86
4,585,018                   06/591,258                   04/29/86
4,585,021                   06/579,262                   04/29/86
4,585,023                   06/634,140                   04/29/86
4,585,034                   06/758,408                   04/29/86
4,585,036                   06/604,579                   04/29/86
4,585,037                   06/553,756                   04/29/86
4,585,040                   06/697,782                   04/29/86
4,585,041                   06/672,458                   04/29/86
4,585,042                   06/527,814                   04/29/86
4,585,044                   06/451,746                   04/29/86
4,585,050                   06/746,947                   04/29/86
4,585,066                   06/676,743                   04/29/86
4,585,068                   06/579,907                   04/29/86
4,585,069                   06/662,447                   04/29/86
4,585,091                   06/633,054                   04/29/86
4,585,093                   06/611,761                   04/29/86
4,585,110                   06/498,231                   04/29/86
4,585,135                   06/706,537                   04/29/86
4,585,136                   06/450,061                   04/29/86
4,585,139                   06/763,491                   04/29/86
4,585,146                   06/504,864                   04/29/86
4,585,148                   06/575,846                   04/29/86
4,585,157                   06/719,987                   04/29/86
4,585,159                   06/724,728                   04/29/86
4,585,160                   06/728,425                   04/29/86
4,585,163                   06/702,232                   04/29/86
4,585,179                   06/615,536                   04/29/86
4,585,180                   06/626,139                   04/29/86
4,585,181                   06/745,273                   04/29/86
4,585,184                   06/634,787                   04/29/86
4,585,186                   06/654,311                   04/29/86
4,585,199                   06/611,592                   04/29/86
4,585,205                   06/620,351                   04/29/86
4,585,207                   06/772,107                   04/29/86
4,585,209                   06/545,907                   04/29/86
4,585,219                   06/750,696                   04/29/86
4,585,226                   06/630,129                   04/29/86
4,585,230                   06/615,833                   04/29/86
4,585,234                   06/704,298                   04/29/86
4,585,238                   06/768,146                   04/29/86
4,585,239                   06/772,568                   04/29/86
4,585,248                   06/620,253                   04/29/86
4,585,257                   06/513,745                   04/29/86
4,585,258                   06/522,703                   04/29/86
4,585,264                   06/613,316                   04/29/86
4,585,266                   06/586,868                   04/29/86
4,585,271                   06/634,388                   04/29/86
4,585,279                   06/631,673                   04/29/86
4,585,282                   06/515,956                   04/29/86
4,585,290                   06/634,816                   04/29/86
4,585,291                   06/531,885                   04/29/86
4,585,294                   06/562,752                   04/29/86
4,585,295                   06/612,547                   04/29/86
4,585,303                   06/520,282                   04/29/86
4,585,310                   06/560,475                   04/29/86
4,585,311                   06/455,932                   04/29/86
4,585,318                   06/570,349                   04/29/86
4,585,327                   06/609,579                   04/29/86
4,585,328                   06/509,136                   04/29/86
4,585,331                   06/642,272                   04/29/86
4,585,342                   06/626,496                   04/29/86
4,585,348                   06/573,783                   04/29/86
4,585,354                   06/618,097                   04/29/86
4,585,357                   06/662,234                   04/29/86
4,585,362                   06/679,342                   04/29/86
4,585,368                   06/650,912                   04/29/86
4,585,379                   06/333,632                   04/29/86
4,585,393                   06/477,701                   04/29/86
4,585,396                   06/556,668                   04/29/86
4,585,417                   06/612,436                   04/29/86
4,585,418                   06/694,892                   04/29/86
4,585,432                   06/602,548                   04/29/86
4,585,433                   06/656,644                   04/29/86
4,585,434                   06/656,645                   04/29/86
4,585,438                   06/484,907                   04/29/86
4,585,441                   06/650,838                   04/29/86
4,585,451                   06/492,567                   04/29/86
4,585,454                   06/581,727                   04/29/86
4,585,463                   06/689,105                   04/29/86
4,585,464                   06/736,414                   04/29/86
4,585,466                   06/506,549                   04/29/86
4,585,468                   06/678,957                   04/29/86
4,585,495                   06/710,542                   04/29/86
4,585,496                   06/710,543                   04/29/86
4,585,502                   06/701,533                   04/29/86
4,585,503                   06/540,798                   04/29/86
4,585,504                   06/694,149                   04/29/86
4,585,508                   06/665,054                   04/29/86
4,585,513                   06/696,465                   04/29/86
4,585,523                   06/583,593                   04/29/86
4,585,526                   06/656,370                   04/29/86
4,585,529                   06/547,563                   04/29/86
4,585,530                   06/764,273                   04/29/86
4,585,545                   06/679,172                   04/29/86
4,585,550                   06/647,772                   04/29/86
4,585,555                   06/433,638                   04/29/86
4,585,558                   06/652,322                   04/29/86
4,585,570                   06/678,972                   04/29/86
4,585,589                   06/626,358                   04/29/86
4,585,591                   06/325,026                   04/29/86
4,585,592                   06/706,472                   04/29/86
4,585,594                   06/680,514                   04/29/86
4,585,604                   06/620,828                   04/29/86
4,585,605                   06/780,117                   04/29/86
4,585,609                   06/449,948                   04/29/86
4,585,615                   06/473,516                   04/29/86
4,585,616                   06/473,515                   04/29/86
4,585,618                   06/580,532                   04/29/86
4,585,620                   06/386,534                   04/29/86
4,585,621                   06/626,500                   04/29/86
4,585,626                   06/516,965                   04/29/86
4,585,629                   06/649,235                   04/29/86
4,585,633                   06/279,089                   04/29/86
4,585,647                   06/672,619                   04/29/86
4,585,648                   06/638,679                   04/29/86
4,585,651                   06/217,746                   04/29/86
4,585,652                   06/673,522                   04/29/86
4,585,654                   06/684,440                   04/29/86
4,585,658                   06/661,371                   04/29/86
4,585,667                   06/687,563                   04/29/86
4,585,669                   06/778,176                   04/29/86
4,585,672                   06/706,175                   04/29/86
4,585,674                   06/704,609                   04/29/86
4,585,677                   06/753,957                   04/29/86
4,585,678                   06/629,664                   04/29/86
4,585,681                   06/624,750                   04/29/86
4,585,682                   06/497,451                   04/29/86
4,585,684                   06/669,968                   04/29/86
4,585,686                   06/682,432                   04/29/86
4,585,688                   06/688,741                   04/29/86
4,585,694                   06/603,917                   04/29/86
4,585,695                   06/652,488                   04/29/86
4,585,697                   06/654,465                   04/29/86
4,585,699                   06/651,834                   04/29/86
4,585,704                   06/642,700                   04/29/86
4,585,707                   06/489,938                   04/29/86
4,585,709                   06/459,713                   04/29/86
4,585,713                   06/671,440                   04/29/86
4,585,717                   06/716,613                   04/29/86
4,585,749                   06/536,921                   04/29/86
4,585,766                   06/645,099                   04/29/86
4,585,771                   06/641,641                   04/29/86
4,585,773                   06/629,649                   04/29/86
4,585,793                   06/492,825                   04/29/86
4,585,797                   06/610,621                   04/29/86
4,585,801                   06/362,684                   04/29/86
4,585,802                   06/764,267                   04/29/86
4,585,804                   06/697,418                   04/29/86
4,585,805                   06/768,064                   04/29/86
4,585,809                   06/579,148                   04/29/86
4,585,810                   06/626,669                   04/29/86
4,585,813                   06/472,206                   04/29/86
4,585,815                   06/560,303                   04/29/86
4,585,816                   06/751,152                   04/29/86
4,585,826                   06/695,651                   04/29/86
4,585,827                   06/630,488                   04/29/86
4,585,828                   06/665,566                   04/29/86
4,585,829                   06/614,712                   04/29/86
4,585,833                   06/498,577                   04/29/86
4,585,835                   06/685,621                   04/29/86
4,585,840                   06/724,272                   04/29/86
4,585,841                   06/547,585                   04/29/86
4,585,846                   06/688,243                   04/29/86
4,585,847                   06/671,037                   04/29/86
4,585,850                   06/645,721                   04/29/86
4,585,851                   06/583,511                   04/29/86
4,585,854                   06/699,286                   04/29/86
4,585,855                   06/706,981                   04/29/86
4,585,857                   06/681,732                   04/29/86
4,585,859                   06/598,016                   04/29/86
4,585,862                   06/577,946                   04/29/86
4,585,874                   06/558,629                   04/29/86
4,585,881                   06/584,864                   04/29/86
4,585,887                   06/677,986                   04/29/86
4,585,890                   06/586,753                   04/29/86
4,585,898                   06/683,027                   04/29/86
4,585,907                   06/558,213                   04/29/86
4,585,908                   06/670,510                   04/29/86
4,585,909                   06/594,181                   04/29/86
4,585,910                   06/561,037                   04/29/86
4,585,912                   06/590,071                   04/29/86
4,585,928                   06/502,118                   04/29/86
4,585,946                   06/585,064                   04/29/86
4,585,950                   06/678,838                   04/29/86
4,585,952                   06/472,326                   04/29/86
4,585,960                   06/659,808                   04/29/86
4,585,966                   06/662,974                   04/29/86
4,585,969                   06/702,074                   04/29/86
4,585,977                   06/678,171                   04/29/86
4,585,984                   06/704,271                   04/29/86
4,585,985                   06/639,173                   04/29/86
4,585,992                   06/576,851                   04/29/86
4,585,996                   06/498,978                   04/29/86
4,586,001                   06/596,353                   04/29/86
4,586,002                   06/616,398                   04/29/86
4,586,012                   06/631,319                   04/29/86
4,586,016                   06/595,918                   04/29/86
4,586,027                   06/638,424                   04/29/86
4,586,031                   06/530,423                   04/29/86
4,586,033                   06/579,431                   04/29/86
4,586,037                   06/472,463                   04/29/86
4,586,042                   06/474,620                   04/29/86
4,586,051                   06/470,538                   04/29/86
4,586,053                   06/610,715                   04/29/86
4,586,056                   06/630,528                   04/29/86
4,586,058                   06/640,126                   04/29/86
4,586,063                   06/595,873                   04/29/86
4,586,064                   06/539,446                   04/29/86
4,586,065                   06/464,456                   04/29/86
4,586,071                   06/609,406                   04/29/86
4,586,072                   06/402,425                   04/29/86
4,586,073                   06/248,205                   04/29/86
4,586,077                   06/618,009                   04/29/86
4,586,079                   06/540,454                   04/29/86
4,586,080                   06/592,201                   04/29/86
4,586,084                   06/758,790                   04/29/86
4,586,086                   06/635,419                   04/29/86
4,586,096                   06/499,932                   04/29/86
4,586,099                   06/480,646                   04/29/86
4,586,100                   06/476,530                   04/29/86
4,586,101                   06/457,906                   04/29/86
4,586,104                   06/560,710                   04/29/86
4,586,105                   06/761,799                   04/29/86
4,586,109                   06/718,136                   04/29/86
4,586,112                   06/605,102                   04/29/86
4,586,115                   06/597,672                   04/29/86
4,586,122                   06/448,688                   04/29/86
4,586,128                   06/485,044                   04/29/86
4,586,134                   06/580,576                   04/29/86
4,586,151                   06/528,934                   04/29/86
4,586,160                   06/482,195                   04/29/86
4,586,168                   06/560,628                   04/29/86
4,586,169                   06/440,723                   04/29/86
4,586,171                   06/381,584                   04/29/86
4,586,173                   06/511,963                   04/29/86
4,586,188                   06/585,243                   04/29/86
4,586,191                   06/406,442                   04/29/86
4,918,752                   07/191,060                   04/24/90
4,918,754                   07/190,150                   04/24/90
4,918,756                   07/278,214                   04/24/90
4,918,760                   07/330,125                   04/24/90
4,918,764                   07/206,251                   04/24/90
4,918,778                   07/258,271                   04/24/90
4,918,780                   07/229,016                   04/24/90
4,918,783                   07/352,449                   04/24/90
4,918,785                   07/321,579                   04/24/90
4,918,789                   07/237,947                   04/24/90
4,918,790                   07/351,862                   04/24/90
4,918,798                   07/197,528                   04/24/90
4,918,808                   07/274,893                   04/24/90
4,918,814                   07/146,879                   04/24/90
4,918,815                   07/294,450                   04/24/90
4,918,817                   07/293,821                   04/24/90
4,918,819                   07/249,615                   04/24/90
4,918,820                   07/302,376                   04/24/90
4,918,824                   07/253,780                   04/24/90
4,918,829                   07/176,233                   04/24/90
4,918,834                   07/297,990                   04/24/90
4,918,839                   07/274,487                   04/24/90
4,918,840                   07/301,847                   04/24/90
4,918,842                   07/184,014                   04/24/90
4,918,855                   07/040,082                   04/24/90
4,918,865                   07/364,503                   04/24/90
4,918,874                   07/229,181                   04/24/90
4,918,877                   07/281,076                   04/24/90
4,918,880                   07/295,827                   04/24/90
4,918,881                   07/306,774                   04/24/90
4,918,883                   07/206,579                   04/24/90
4,918,887                   07/109,471                   04/24/90
4,918,891                   07/339,842                   04/24/90
4,918,893                   07/262,707                   04/24/90
4,918,894                   07/275,045                   04/24/90
4,918,895                   07/295,960                   04/24/90
4,918,899                   07/284,208                   04/24/90
4,918,900                   07/374,303                   04/24/90
4,918,902                   07/225,838                   04/24/90
4,918,905                   07/212,677                   04/24/90
4,918,914                   07/123,242                   04/24/90
4,918,916                   07/236,368                   04/24/90
4,918,920                   07/207,054                   04/24/90
4,918,923                   07/201,919                   04/24/90
4,918,927                   07/403,374                   04/24/90
4,918,941                   07/353,804                   04/24/90
4,918,942                   07/419,982                   04/24/90
4,918,949                   07/173,455                   04/24/90
4,918,953                   07/304,235                   04/24/90
4,918,954                   07/365,740                   04/24/90
4,918,958                   07/005,163                   04/24/90
4,918,961                   07/235,958                   04/24/90
4,918,968                   07/377,879                   04/24/90
4,918,976                   07/383,122                   04/24/90
4,918,983                   07/344,593                   04/24/90
4,918,985                   07/295,490                   04/24/90
4,918,988                   07/316,608                   04/24/90
4,918,991                   07/280,867                   04/24/90
4,918,994                   07/279,549                   04/24/90
4,919,002                   07/313,747                   04/24/90
4,919,011                   07/292,920                   04/24/90
4,919,017                   07/303,500                   04/24/90
4,919,023                   07/171,546                   04/24/90
4,919,024                   07/226,367                   04/24/90
4,919,029                   07/295,441                   04/24/90
4,919,034                   07/365,534                   04/24/90
4,919,039                   07/223,850                   04/24/90
4,919,044                   07/279,856                   04/24/90
4,919,054                   07/250,986                   04/24/90
4,919,060                   07/301,899                   04/24/90
4,919,061                   07/336,822                   04/24/90
4,919,065                   07/305,579                   04/24/90
4,919,071                   07/250,475                   04/24/90
4,919,076                   07/252,828                   04/24/90
4,919,078                   07/277,970                   04/24/90
4,919,081                   07/195,860                   04/24/90
4,919,088                   07/369,359                   04/24/90
4,919,091                   07/369,135                   04/24/90
4,919,093                   07/340,724                   04/24/90
4,919,099                   07/167,694                   04/24/90
4,919,105                   07/285,676                   04/24/90
4,919,108                   07/434,096                   04/24/90
4,919,118                   07/394,398                   04/24/90
4,919,129                   07/125,652                   04/24/90
4,919,138                   07/272,646                   04/24/90
4,919,139                   06/945,660                   04/24/90
4,919,148                   07/218,710                   04/24/90
4,919,150                   07/378,359                   04/24/90
4,919,156                   07/351,535                   04/24/90
4,919,160                   07/243,278                   04/24/90
4,919,162                   07/102,339                   04/24/90
4,919,166                   07/372,838                   04/24/90
4,919,167                   07/325,551                   04/24/90
4,919,169                   07/338,917                   04/24/90
4,919,170                   07/230,277                   04/24/90
4,919,175                   07/223,234                   04/24/90
4,919,186                   07/366,876                   04/24/90
4,919,188                   07/353,475                   04/24/90
4,919,190                   07/234,253                   04/24/90
4,919,195                   07/144,206                   04/24/90
4,919,205                   07/441,827                   04/24/90
4,919,206                   07/381,930                   04/24/90
4,919,207                   07/354,457                   04/24/90
4,919,208                   07/096,127                   04/24/90
4,919,217                   07/368,595                   04/24/90
4,919,225                   07/175,815                   04/24/90
4,919,226                   07/266,422                   04/24/90
4,919,228                   07/296,932                   04/24/90
4,919,236                   07/033,089                   04/24/90
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5,305,860                   07/443,496                   04/26/94