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 November 26, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,577                  06/869,668                   01/12/88
4,555,221                  (06/573,302)                (11/26/85)
Re. 33,018                  07/066,705                   08/15/89
4,554,749                  (06/653,484)                (11/26/85)
Re. 33,963                  07/647,611                   06/16/92
4,882,144                  (06/864,677)                (11/21/89)
4,554,687                   06/674,561                   11/26/85
4,554,688                   06/580,789                   11/26/85
4,554,694                   06/586,984                   11/26/85
4,554,699                   06/593,718                   11/26/85
4,554,702                   06/639,956                   11/26/85
4,554,704                   06/560,910                   11/26/85
4,554,718                   06/616,499                   11/26/85
4,554,719                   06/481,244                   11/26/85
4,554,724                   06/636,330                   11/26/85
4,554,725                   06/497,930                   11/26/85
4,554,727                   06/612,669                   11/26/85
4,554,741                   06/598,829                   11/26/85
4,554,743                   06/595,139                   11/26/85
4,554,744                   06/567,043                   11/26/85
4,554,754                   06/628,222                   11/26/85
4,554,763                   06/561,428                   11/26/85
4,554,766                   06/642,426                   11/26/85
4,554,771                   06/626,887                   11/26/85
4,554,796                   06/640,544                   11/26/85
4,554,799                   06/665,565                   11/26/85
4,554,808                   06/513,494                   11/26/85
4,554,813                   06/557,838                   11/26/85
4,554,815                   06/533,867                   11/26/85
4,554,827                   06/598,433                   11/26/85
4,554,833                   06/532,213                   11/26/85
4,554,837                   06/607,060                   11/26/85
4,554,838                   06/576,120                   11/26/85
4,554,841                   06/548,834                   11/26/85
4,554,842                   06/487,962                   11/26/85
4,554,851                   06/635,533                   11/26/85
4,554,862                   06/623,092                   11/26/85
4,554,876                   06/602,051                   11/26/85
4,554,878                   06/680,209                   11/26/85
4,554,879                   06/602,328                   11/26/85
4,554,880                   06/604,745                   11/26/85
4,554,890                   06/638,686                   11/26/85
4,554,897                   06/705,216                   11/26/85
4,554,898                   06/705,323                   11/26/85
4,554,902                   06/622,910                   11/26/85
4,554,907                   06/560,856                   11/26/85
4,554,909                   06/498,919                   11/26/85
4,554,944                   06/736,831                   11/26/85
4,554,945                   06/532,035                   11/26/85
4,554,947                   06/666,186                   11/26/85
4,554,948                   06/623,642                   11/26/85
4,554,951                   06/550,752                   11/26/85
4,554,954                   06/550,863                   11/26/85
4,554,960                   06/606,753                   11/26/85
4,554,964                   06/579,018                   11/26/85
4,554,970                   06/386,950                   11/26/85
4,554,974                   06/559,524                   11/26/85
4,554,975                   06/385,528                   11/26/85
4,554,980                   06/515,364                   11/26/85
4,554,984                   06/674,781                   11/26/85
4,554,995                   06/706,845                   11/26/85
4,555,012                   06/559,553                   11/26/85
4,555,014                   06/680,749                   11/26/85
4,555,028                   06/605,907                   11/26/85
4,555,029                   06/480,316                   11/26/85
4,555,038                   06/632,947                   11/26/85
4,555,041                   06/632,714                   11/26/85
4,555,043                   06/676,737                   11/26/85
4,555,047                   06/524,756                   11/26/85
4,555,064                   06/573,888                   11/26/85
4,555,066                   06/513,151                   11/26/85
4,555,070                   06/617,292                   11/26/85
4,555,075                   06/711,319                   11/26/85
4,555,080                   06/602,589                   11/26/85
4,555,081                   06/435,571                   11/26/85
4,555,082                   06/612,476                   11/26/85
4,555,085                   06/442,190                   11/26/85
4,555,087                   06/592,713                   11/26/85
4,555,089                   06/588,390                   11/26/85
4,555,100                   06/583,319                   11/26/85
4,555,103                   06/607,851                   11/26/85
4,555,108                   06/588,804                   11/26/85
4,555,109                   06/532,223                   11/26/85
4,555,112                   06/534,809                   11/26/85
4,555,116                   06/387,091                   11/26/85
4,555,117                   06/635,905                   11/26/85
4,555,121                   06/652,289                   11/26/85
4,555,146                   06/476,510                   11/26/85
4,555,151                   06/638,174                   11/26/85
4,555,153                   06/581,709                   11/26/85
4,555,158                   06/712,620                   11/26/85
4,555,159                   06/638,276                   11/26/85
4,555,164                   06/471,765                   11/26/85
4,555,181                   06/314,292                   11/26/85
4,555,186                   06/578,895                   11/26/85
4,555,191                   06/668,319                   11/26/85
4,555,198                   06/646,997                   11/26/85
4,555,207                   06/600,380                   11/26/85
4,555,215                   06/558,201                   11/26/85
4,555,218                   06/610,294                   11/26/85
4,555,219                   06/644,001                   11/26/85
4,555,227                   06/628,013                   11/26/85
4,555,241                   06/451,045                   11/26/85
4,555,248                   06/622,371                   11/26/85
4,555,249                   06/562,087                   11/26/85
4,555,253                   06/606,634                   11/26/85
4,555,256                   06/490,359                   11/26/85
4,555,260                   06/523,227                   11/26/85
4,555,262                   06/525,365                   11/26/85
4,555,263                   06/447,137                   11/26/85
4,555,270                   06/605,803                   11/26/85
4,555,271                   06/621,542                   11/26/85
4,555,277                   06/696,276                   11/26/85
4,555,278                   06/696,200                   11/26/85
4,555,281                   06/661,247                   11/26/85
4,555,285                   06/561,373                   11/26/85
4,555,287                   06/619,182                   11/26/85
4,555,289                   06/500,189                   11/26/85
4,555,293                   06/517,824                   11/26/85
4,555,296                   06/669,509                   11/26/85
4,555,300                   06/581,752                   11/26/85
4,555,317                   06/561,726                   11/26/85
4,555,318                   06/568,769                   11/26/85
4,555,325                   06/626,183                   11/26/85
4,555,346                   06/651,338                   11/26/85
4,555,350                   06/642,552                   11/26/85
4,555,368                   06/675,492                   11/26/85
4,555,373                   06/480,312                   11/26/85
4,555,379                   06/719,398                   11/26/85
4,555,381                   06/477,951                   11/26/85
4,555,389                   06/604,720                   11/26/85
4,555,397                   06/522,858                   11/26/85
4,555,398                   06/534,622                   11/26/85
4,555,399                   06/587,533                   11/26/85
4,555,407                   06/686,049                   11/26/85
4,555,409                   06/598,079                   11/26/85
4,555,416                   06/644,490                   11/26/85
4,555,418                   06/682,119                   11/26/85
4,555,422                   06/569,634                   11/26/85
4,555,423                   06/624,452                   11/26/85
4,555,435                   06/575,078                   11/26/85
4,555,448                   06/629,396                   11/26/85
4,555,459                   06/571,862                   11/26/85
4,555,460                   06/528,352                   11/26/85
4,555,469                   06/542,173                   11/26/85
4,555,475                   06/531,896                   11/26/85
4,555,477                   06/688,479                   11/26/85
4,555,488                   06/559,657                   11/26/85
4,555,489                   06/559,658                   11/26/85
4,555,504                   06/589,035                   11/26/85
4,555,505                   06/584,629                   11/26/85
4,555,517                   06/637,352                   11/26/85
4,555,520                   06/642,006                   11/26/85
4,555,523                   06/617,199                   11/26/85
4,555,525                   06/646,191                   11/26/85
4,555,527                   06/681,838                   11/26/85
4,555,530                   06/581,429                   11/26/85
4,555,536                   06/627,580                   11/26/85
4,555,538                   06/564,420                   11/26/85
4,555,540                   06/687,576                   11/26/85
4,555,541                   06/579,232                   11/26/85
4,555,542                   06/564,342                   11/26/85
4,555,558                   06/664,631                   11/26/85
4,555,567                   06/537,774                   11/26/85
4,555,576                   06/612,155                   11/26/85
4,555,577                   06/576,183                   11/26/85
4,555,578                   06/493,573                   11/26/85
4,555,589                   06/674,809                   11/26/85
4,555,590                   06/469,824                   11/26/85
4,555,592                   06/496,904                   11/26/85
4,555,597                   06/558,130                   11/26/85
4,555,604                   06/558,723                   11/26/85
4,555,620                   06/457,301                   11/26/85
4,555,629                   06/529,439                   11/26/85
4,555,630                   06/559,746                   11/26/85
4,555,631                   06/464,544                   11/26/85
4,555,633                   06/404,422                   11/26/85
4,555,635                   06/501,165                   11/26/85
4,555,642                   06/534,783                   11/26/85
4,555,652                   06/313,641                   11/26/85
4,555,653                   06/556,786                   11/26/85
4,555,658                   06/547,587                   11/26/85
4,555,663                   06/552,374                   11/26/85
4,555,666                   06/379,736                   11/26/85
4,555,667                   06/536,140                   11/26/85
4,555,677                   06/596,270                   11/26/85
4,555,679                   06/496,733                   11/26/85
4,555,683                   06/574,847                   11/26/85
4,555,685                   06/675,473                   11/26/85
4,555,692                   06/551,377                   11/26/85
4,555,699                   06/456,611                   11/26/85
4,555,700                   06/493,677                   11/26/85
4,555,715                   06/627,985                   11/26/85
4,555,721                   06/548,733                   11/26/85
4,555,729                   06/451,685                   11/26/85
4,555,735                   06/538,834                   11/26/85
4,555,737                   06/530,114                   11/26/85
4,555,739                   06/444,767                   11/26/85
4,555,742                   06/608,335                   11/26/85
4,555,753                   06/546,269                   11/26/85
4,555,760                   06/491,516                   11/26/85
4,555,765                   06/418,186                   11/26/85
4,555,769                   06/498,214                   11/26/85
4,555,771                   06/362,449                   11/26/85
4,555,776                   06/369,970                   11/26/85
4,555,777                   06/640,715                   11/26/85
4,555,785                   06/589,796                   11/26/85
4,555,797                   06/648,428                   11/26/85
4,555,801                   06/691,164                   11/26/85
4,555,802                   06/456,920                   11/26/85
4,555,807                   06/520,927                   11/26/85
4,555,808                   06/446,356                   11/26/85
4,555,810                   06/410,752                   11/26/85
4,881,279                   07/325,886                   11/21/89
4,881,284                   07/260,936                   11/21/89
4,881,286                   07/237,407                   11/21/89
4,881,290                   07/224,125                   11/21/89
4,881,293                   07/222,049                   11/21/89
4,881,295                   07/234,273                   11/21/89
4,881,296                   07/305,909                   11/21/89
4,881,298                   07/223,127                   11/21/89
4,881,304                   07/240,509                   11/21/89
4,881,305                   07/188,285                   11/21/89
4,881,310                   07/276,646                   11/21/89
4,881,315                   07/300,528                   11/21/89
4,881,325                   07/254,189                   11/21/89
4,881,327                   07/308,258                   11/21/89
4,881,330                   07/351,324                   11/21/89
4,881,333                   07/113,054                   11/21/89
4,881,337                   07/186,368                   11/21/89
4,881,341                   07/195,907                   11/21/89
4,881,352                   07/226,107                   11/21/89
4,881,364                   07/225,893                   11/21/89
4,881,374                   07/320,745                   11/21/89
4,881,375                   07/320,730                   11/21/89
4,881,385                   07/173,621                   11/21/89
4,881,390                   07/213,386                   11/21/89
4,881,391                   07/211,560                   11/21/89
4,881,393                   07/240,069                   11/21/89
4,881,400                   07/248,761                   11/21/89
4,881,404                   07/165,830                   11/21/89
4,881,405                   07/145,147                   11/21/89
4,881,411                   07/263,305                   11/21/89
4,881,417                   07/119,937                   11/21/89
4,881,421                   07/183,737                   11/21/89
4,881,424                   07/195,806                   11/21/89
4,881,435                   07/146,711                   11/21/89
4,881,443                   07/227,617                   11/21/89
4,881,456                   07/162,104                   11/21/89
4,881,466                   07/288,939                   11/21/89
4,881,470                   07/047,979                   11/21/89
4,881,472                   07/260,446                   11/21/89
4,881,476                   07/224,413                   11/21/89
4,881,478                   07/183,625                   11/21/89
4,881,481                   07/265,045                   11/21/89
4,881,486                   07/253,226                   11/21/89
4,881,488                   07/199,325                   11/21/89
4,881,489                   07/207,117                   11/21/89
4,881,491                   07/250,608                   11/21/89
4,881,493                   07/127,899                   11/21/89
4,881,494                   07/167,900                   11/21/89
4,881,497                   07/197,886                   11/21/89
4,881,499                   07/296,599                   11/21/89
4,881,500                   07/274,908                   11/21/89
4,881,512                   07/238,656                   11/21/89
4,881,518                   07/266,790                   11/21/89
4,881,520                   07/120,038                   11/21/89
4,881,521                   07/272,742                   11/21/89
4,881,524                   07/301,834                   11/21/89
4,881,527                   07/271,585                   11/21/89
4,881,540                   07/152,651                   11/21/89
4,881,541                   07/287,721                   11/21/89
4,881,548                   07/012,844                   11/21/89
4,881,551                   07/150,984                   11/21/89
4,881,553                   07/123,587                   11/21/89
4,881,562                   07/345,180                   11/21/89
4,881,566                   07/256,806                   11/21/89
4,881,570                   07/210,769                   11/21/89
4,881,574                   07/231,427                   11/21/89
4,881,575                   07/242,600                   11/21/89
4,881,576                   07/131,670                   11/21/89
4,881,578                   07/265,971                   11/21/89
4,881,583                   07/197,187                   11/21/89
4,881,584                   07/294,233                   11/21/89
4,881,585                   07/263,263                   11/21/89
4,881,590                   07/169,483                   11/21/89
4,881,596                   07/339,893                   11/21/89
4,881,600                   07/125,366                   11/21/89
4,881,603                   07/286,255                   11/21/89
4,881,605                   07/244,767                   11/21/89
4,881,607                   07/321,863                   11/21/89
4,881,613                   07/184,984                   11/21/89
4,881,616                   07/335,079                   11/21/89
4,881,621                   07/198,562                   11/21/89
4,881,622                   07/162,679                   11/21/89
4,881,625                   07/211,623                   11/21/89
4,881,631                   07/204,352                   11/21/89
4,881,633                   07/101,399                   11/21/89
4,881,636                   07/137,969                   11/21/89
4,881,637                   07/326,357                   11/21/89
4,881,642                   07/283,146                   11/21/89
4,881,646                   06/610,994                   11/21/89
4,881,649                   07/339,969                   11/21/89
4,881,650                   07/206,313                   11/21/89
4,881,652                   07/252,528                   11/21/89
4,881,656                   07/261,508                   11/21/89
4,881,658                   07/233,071                   11/21/89
4,881,662                   07/199,830                   11/21/89
4,881,663                   07/209,020                   11/21/89
4,881,665                   07/171,785                   11/21/89
4,881,666                   07/145,588                   11/21/89
4,881,667                   07/069,760                   11/21/89
4,881,670                   07/246,570                   11/21/89
4,881,678                   07/145,991                   11/21/89
4,881,681                   07/243,608                   11/21/89
4,881,682                   07/203,401                   11/21/89
4,881,688                   07/265,226                   11/21/89
4,881,690                   07/232,095                   11/21/89
4,881,696                   07/139,159                   11/21/89
4,881,699                   07/134,545                   11/21/89
4,881,701                   07/168,015                   11/21/89
4,881,709                   07/195,973                   11/21/89
4,881,716                   07/255,387                   11/21/89
4,881,718                   07/125,979                   11/21/89
4,881,719                   07/248,050                   11/21/89
4,881,729                   07/276,849                   11/21/89
4,881,732                   07/158,649                   11/21/89
4,881,739                   07/121,749                   11/21/89
4,881,742                   07/271,032                   11/21/89
4,881,749                   07/241,044                   11/21/89
4,881,754                   07/237,759                   11/21/89
4,881,757                   07/305,296                   11/21/89
4,881,758                   07/303,901                   11/21/89
4,881,766                   07/094,710                   11/21/89
4,881,768                   07/136,848                   11/21/89
4,881,769                   07/210,315                   11/21/89
4,881,773                   07/235,165                   11/21/89
4,881,775                   07/304,436                   11/21/89
4,881,777                   07/234,854                   11/21/89
4,881,791                   07/288,036                   11/21/89
4,881,802                   07/189,546                   11/21/89
4,881,818                   06/855,006                   11/21/89
4,881,830                   07/304,137                   11/21/89
4,881,831                   07/155,098                   11/21/89
4,881,847                   06/937,023                   11/21/89
4,881,849                   07/263,395                   11/21/89
4,881,853                   07/196,214                   11/21/89
4,881,863                   07/134,012                   11/21/89
4,881,873                   07/284,172                   11/21/89
4,881,876                   07/284,629                   11/21/89
4,881,882                   07/199,326                   11/21/89
4,881,889                   07/331,354                   11/21/89
4,881,893                   07/290,647                   11/21/89
4,881,897                   07/154,349                   11/21/89
4,881,898                   07/181,664                   11/21/89
4,881,899                   07/254,148                   11/21/89
4,881,910                   07/098,560                   11/21/89
4,881,911                   07/326,762                   11/21/89
4,881,914                   07/278,884                   11/21/89
4,881,915                   07/178,297                   11/21/89
4,881,921                   07/166,432                   11/21/89
4,881,928                   07/254,929                   11/21/89
4,881,933                   07/158,418                   11/21/89
4,881,940                   07/227,440                   11/21/89
4,881,941                   07/217,800                   11/21/89
4,881,942                   07/217,122                   11/21/89
4,881,944                   07/318,396                   11/21/89
4,881,946                   07/276,680                   11/21/89
4,881,949                   07/224,855                   11/21/89
4,881,950                   07/104,695                   11/21/89
4,881,957                   06/482,604                   11/21/89
4,881,958                   07/240,944                   11/21/89
4,881,961                   07/198,328                   11/21/89
4,881,964                   07/198,031                   11/21/89
4,881,969                   07/310,753                   11/21/89
4,881,978                   07/140,720                   11/21/89
4,881,979                   07/171,629                   11/21/89
4,881,981                   07/183,818                   11/21/89
4,881,985                   07/228,435                   11/21/89
4,881,987                   07/295,773                   11/21/89
4,881,991                   07/067,614                   11/21/89
4,881,993                   07/373,851                   11/21/89
4,881,995                   07/092,454                   11/21/89
4,882,001                   07/225,323                   11/21/89
4,882,004                   07/137,770                   11/21/89
4,882,012                   07/130,947                   11/21/89
4,882,013                   07/018,046                   11/21/89
4,882,014                   07/159,759                   11/21/89
4,882,017                   07/208,466                   11/21/89
4,882,018                   07/178,032                   11/21/89
4,882,024                   07/157,516                   11/21/89
4,882,025                   07/216,334                   11/21/89
4,882,029                   07/012,884                   11/21/89
4,882,031                   07/288,304                   11/21/89
4,882,032                   07/211,606                   11/21/89
4,882,035                   07/084,637                   11/21/89
4,882,036                   07/291,390                   11/21/89
4,882,041                   07/059,697                   11/21/89
4,882,045                   07/233,559                   11/21/89
4,882,065                   07/131,611                   11/21/89
4,882,071                   07/146,638                   11/21/89
4,882,076                   07/253,012                   11/21/89
4,882,077                   07/165,853                   11/21/89
4,882,084                   07/113,763                   11/21/89
4,882,087                   07/213,476                   11/21/89
4,882,088                   07/036,325                   11/21/89
4,882,092                   07/202,793                   11/21/89
4,882,094                   07/160,920                   11/21/89
4,882,097                   07/240,690                   11/21/89
4,882,098                   07/209,158                   11/21/89
4,882,099                   07/275,522                   11/21/89
4,882,104                   07/173,933                   11/21/89
4,882,106                   07/024,652                   11/21/89
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