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 5, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number             Serial Number                Issue Date

Re. 32,738                  07/114,233                   08/30/88
(4,550,516)                (06/560,385)                (11/05/85)
Re. 34,505                  07/757,008                   01/11/94
(4,877,327)                (07/315,914)                (10/31/89)
Re. 34,562                  07/761,501                   03/15/94
(4,878,230)                (07/207,155)                (10/31/89)
4,550,445                   06/607,265                   11/05/85
4,550,450                   06/634,482                   11/05/85
4,550,452                   06/575,072                   11/05/85
4,550,453                   06/636,968                   11/05/85
4,550,454                   06/661,976                   11/05/85
4,550,456                   06/577,559                   11/05/85
4,550,460                   06/510,549                   11/05/85
4,550,470                   06/614,604                   11/05/85
4,550,471                   06/635,614                   11/05/85
4,550,474                   06/553,763                   11/05/85
4,550,482                   06/564,566                   11/05/85
4,550,487                   06/425,621                   11/05/85
4,550,490                   06/599,946                   11/05/85
4,550,493                   06/578,147                   11/05/85
4,550,500                   06/535,774                   11/05/85
4,550,503                   06/621,196                   11/05/85
4,550,509                   06/492,828                   11/05/85
4,550,510                   06/605,560                   11/05/85
4,550,511                   06/487,881                   11/05/85
4,550,538                   06/474,580                   11/05/85
4,550,557                   06/606,246                   11/05/85
4,550,560                   06/593,633                   11/05/85
4,550,570                   06/629,631                   11/05/85
4,550,571                   06/566,212                   11/05/85
4,550,573                   06/560,613                   11/05/85
4,550,576                   06/651,901                   11/05/85
4,550,582                   06/436,993                   11/05/85
4,550,585                   06/660,017                   11/05/85
4,550,588                   06/448,172                   11/05/85
4,550,591                   06/591,152                   11/05/85
4,550,592                   06/607,783                   11/05/85
4,550,599                   06/459,865                   11/05/85
4,550,601                   06/583,562                   11/05/85
4,550,614                   06/691,003                   11/05/85
4,550,615                   06/527,326                   11/05/85
4,550,617                   06/607,262                   11/05/85
4,550,618                   06/504,425                   11/05/85
4,550,623                   06/545,014                   11/05/85
4,550,624                   06/544,060                   11/05/85
4,550,627                   06/447,346                   11/05/85
4,550,628                   06/585,802                   11/05/85
4,550,631                   06/536,356                   11/05/85
4,550,635                   06/509,444                   11/05/85
4,550,636                   06/617,009                   11/05/85
4,550,641                   06/555,689                   11/05/85
4,550,642                   06/667,543                   11/05/85
4,550,650                   06/471,817                   11/05/85
4,550,657                   06/662,226                   11/05/85
4,550,663                   06/584,069                   11/05/85
4,550,666                   06/493,645                   11/05/85
4,550,680                   06/672,957                   11/05/85
4,550,681                   06/539,913                   11/05/85
4,550,688                   06/632,750                   11/05/85
4,550,691                   06/691,876                   11/05/85
4,550,694                   06/609,575                   11/05/85
4,550,708                   06/510,439                   11/05/85
4,550,712                   06/508,535                   11/05/85
4,550,716                   06/603,695                   11/05/85
4,550,736                   06/659,295                   11/05/85
4,550,747                   06/539,299                   11/05/85
4,550,751                   06/442,437                   11/05/85
4,550,753                   06/561,465                   11/05/85
4,550,758                   06/530,503                   11/05/85
4,550,759                   06/495,276                   11/05/85
4,550,762                   06/544,011                   11/05/85
4,550,766                   06/597,835                   11/05/85
4,550,767                   06/597,912                   11/05/85
4,550,774                   06/462,776                   11/05/85
4,550,781                   06/617,746                   11/05/85
4,550,792                   06/617,973                   11/05/85
4,550,796                   06/683,444                   11/05/85
4,550,813                   06/594,122                   11/05/85
4,550,821                   06/563,599                   11/05/85
4,550,822                   06/470,590                   11/05/85
4,550,829                   06/565,107                   11/05/85
4,550,841                   06/549,477                   11/05/85
4,550,845                   06/704,505                   11/05/85
4,550,860                   06/288,642                   11/05/85
4,550,868                   06/576,548                   11/05/85
4,550,870                   06/541,546                   11/05/85
4,550,877                   06/404,905                   11/05/85
4,550,881                   06/555,767                   11/05/85
4,550,883                   06/501,271                   11/05/85
4,550,884                   06/554,428                   11/05/85
4,550,885                   06/645,131                   11/05/85
4,550,886                   06/606,764                   11/05/85
4,550,889                   06/397,383                   11/05/85
4,550,891                   06/539,645                   11/05/85
4,550,892                   06/601,688                   11/05/85
4,550,894                   06/439,589                   11/05/85
4,550,901                   06/481,840                   11/05/85
4,550,906                   06/466,882                   11/05/85
4,550,924                   06/513,980                   11/05/85
4,550,935                   06/451,538                   11/05/85
4,550,941                   06/217,055                   11/05/85
4,550,948                   06/531,253                   11/05/85
4,550,972                   06/598,127                   11/05/85
4,550,977                   06/619,966                   11/05/85
4,550,991                   06/675,310                   11/05/85
4,550,998                   06/369,084                   11/05/85
4,551,002                   06/616,354                   11/05/85
4,551,008                   06/564,256                   11/05/85
4,551,014                   06/694,482                   11/05/85
4,551,015                   06/534,032                   11/05/85
4,551,017                   06/426,400                   11/05/85
4,551,018                   06/430,900                   11/05/85
4,551,019                   06/521,003                   11/05/85
4,551,031                   06/498,130                   11/05/85
4,551,050                   06/512,215                   11/05/85
4,551,054                   06/587,676                   11/05/85
4,551,067                   06/471,342                   11/05/85
4,551,068                   06/517,186                   11/05/85
4,551,071                   06/616,459                   11/05/85
4,551,076                   06/540,045                   11/05/85
4,551,086                   06/512,814                   11/05/85
4,551,092                   06/550,855                   11/05/85
4,551,097                   06/702,496                   11/05/85
4,551,098                   06/510,404                   11/05/85
4,551,099                   06/632,100                   11/05/85
4,551,111                   06/526,282                   11/05/85
4,551,115                   06/613,197                   11/05/85
4,551,116                   06/614,443                   11/05/85
4,551,117                   06/513,211                   11/05/85
4,551,118                   06/586,281                   11/05/85
4,551,119                   06/579,969                   11/05/85
4,551,123                   06/543,319                   11/05/85
4,551,124                   06/463,570                   11/05/85
4,551,126                   06/550,136                   11/05/85
4,551,138                   06/714,342                   11/05/85
4,551,141                   06/519,723                   11/05/85
4,551,146                   06/431,333                   11/05/85
4,551,154                   06/471,278                   11/05/85
4,551,155                   06/511,767                   11/05/85
4,551,157                   06/470,287                   11/05/85
4,551,166                   06/612,264                   11/05/85
4,551,170                   06/679,976                   11/05/85
4,551,172                   06/638,912                   11/05/85
4,551,175                   06/601,286                   11/05/85
4,551,180                   06/599,001                   11/05/85
4,551,183                   06/635,963                   11/05/85
4,551,190                   06/628,441                   11/05/85
4,551,192                   06/509,738                   11/05/85
4,551,202                   06/575,447                   11/05/85
4,551,207                   06/576,545                   11/05/85
4,551,208                   06/614,280                   11/05/85
4,551,211                   06/631,577                   11/05/85
4,551,212                   06/710,290                   11/05/85
4,551,225                   06/613,205                   11/05/85
4,551,226                   06/352,818                   11/05/85
4,551,229                   06/590,600                   11/05/85
4,551,234                   06/637,378                   11/05/85
4,551,240                   06/575,173                   11/05/85
4,551,241                   06/578,268                   11/05/85
4,551,248                   06/500,640                   11/05/85
4,551,267                   06/574,160                   11/05/85
4,551,269                   06/382,909                   11/05/85
4,551,282                   06/499,331                   11/05/85
4,551,299                   06/418,141                   11/05/85
4,551,300                   06/456,739                   11/05/85
4,551,301                   06/577,748                   11/05/85
4,551,304                   06/610,246                   11/05/85
4,551,305                   06/544,384                   11/05/85
4,551,306                   06/496,452                   11/05/85
4,551,315                   06/675,093                   11/05/85
4,551,321                   06/476,577                   11/05/85
4,551,326                   06/468,487                   11/05/85
4,551,332                   06/542,645                   11/05/85
4,551,335                   06/480,835                   11/05/85
4,551,341                   06/373,483                   11/05/85
4,551,347                   06/531,983                   11/05/85
4,551,353                   06/633,675                   11/05/85
4,551,364                   06/630,275                   11/05/85
4,551,369                   06/645,508                   11/05/85
4,551,372                   06/592,895                   11/05/85
4,551,374                   06/622,756                   11/05/85
4,551,376                   06/731,376                   11/05/85
4,551,378                   06/629,770                   11/05/85
4,551,389                   06/693,720                   11/05/85
4,551,394                   06/674,903                   11/05/85
4,551,409                   06/549,286                   11/05/85
4,551,415                   06/611,870                   11/05/85
4,551,431                   06/487,362                   11/05/85
4,551,432                   06/551,646                   11/05/85
4,551,435                   06/526,039                   11/05/85
4,551,439                   06/700,592                   11/05/85
4,551,451                   06/639,687                   11/05/85
4,551,453                   06/518,848                   11/05/85
4,551,463                   06/533,673                   11/05/85
4,551,465                   06/565,902                   11/05/85
4,551,477                   06/625,715                   11/05/85
4,551,480                   06/585,515                   11/05/85
4,551,486                   06/552,300                   11/05/85
4,551,508                   06/613,306                   11/05/85
4,551,517                   06/680,862                   11/05/85
4,551,526                   06/654,430                   11/05/85
4,551,527                   06/279,636                   11/05/85
4,551,533                   06/593,160                   11/05/85
4,551,537                   06/654,429                   11/05/85
4,551,539                   06/661,641                   11/05/85
4,551,540                   06/661,640                   11/05/85
4,551,543                   06/563,971                   11/05/85
4,551,553                   06/468,261                   11/05/85
4,551,555                   06/616,594                   11/05/85
4,551,562                   06/588,999                   11/05/85
4,551,565                   06/510,387                   11/05/85
4,551,572                   06/641,830                   11/05/85
4,551,573                   06/655,825                   11/05/85
4,551,578                   06/712,605                   11/05/85
4,551,579                   06/536,729                   11/05/85
4,551,583                   06/587,373                   11/05/85
4,551,585                   06/566,246                   11/05/85
4,551,588                   06/623,388                   11/05/85
4,551,591                   06/621,841                   11/05/85
4,551,598                   06/610,652                   11/05/85
4,551,601                   06/597,752                   11/05/85
4,551,604                   06/503,542                   11/05/85
4,551,606                   06/498,177                   11/05/85
4,551,613                   06/531,299                   11/05/85
4,551,616                   06/628,504                   11/05/85
4,551,617                   06/621,209                   11/05/85
4,551,618                   06/438,622                   11/05/85
4,551,619                   06/693,149                   11/05/85
4,551,621                   06/675,190                   11/05/85
4,551,647                   06/472,871                   11/05/85
4,551,651                   06/642,745                   11/05/85
4,551,655                   06/438,125                   11/05/85
4,551,656                   06/437,971                   11/05/85
4,551,662                   06/711,535                   11/05/85
4,551,665                   06/636,426                   11/05/85
4,551,668                   06/603,139                   11/05/85
4,551,671                   06/507,252                   11/05/85
4,551,673                   06/307,026                   11/05/85
4,551,679                   06/493,965                   11/05/85
4,551,680                   06/487,294                   11/05/85
4,551,684                   06/463,713                   11/05/85
4,551,692                   06/594,100                   11/05/85
4,551,699                   06/721,121                   11/05/85
4,551,702                   06/573,847                   11/05/85
4,551,703                   06/448,849                   11/05/85
4,551,704                   06/536,429                   11/05/85
4,551,718                   06/507,560                   11/05/85
4,551,725                   06/414,913                   11/05/85
4,551,729                   06/511,630                   11/05/85
4,551,730                   06/470,017                   11/05/85
4,551,737                   06/504,760                   11/05/85
4,551,741                   06/565,531                   11/05/85
4,551,742                   06/640,570                   11/05/85
4,551,750                   06/413,199                   11/05/85
4,551,754                   06/350,088                   11/05/85
4,551,761                   06/582,621                   11/05/85
4,551,766                   06/355,465                   11/05/85
4,551,770                   06/567,535                   11/05/85
4,551,772                   06/594,263                   11/05/85
4,551,775                   06/334,361                   11/05/85
4,551,778                   06/519,641                   11/05/85
4,551,779                   06/540,666                   11/05/85
4,551,786                   06/615,821                   11/05/85
4,551,787                   06/649,877                   11/05/85
4,551,789                   06/449,095                   11/05/85
4,551,792                   06/533,326                   11/05/85
4,551,795                   06/468,845                   11/05/85
4,551,798                   06/438,703                   11/05/85
4,551,811                   06/405,281                   11/05/85
4,551,813                   06/439,985                   11/05/85
4,551,817                   06/544,740                   11/05/85
4,551,819                   06/368,072                   11/05/85
4,551,824                   06/434,300                   11/05/85
4,551,832                   06/557,693                   11/05/85
4,551,835                   06/508,312                   11/05/85
4,551,836                   06/506,567                   11/05/85
4,551,839                   06/460,534                   11/05/85
4,551,843                   06/511,460                   11/05/85
4,551,849                   06/491,292                   11/05/85
4,551,851                   06/610,180                   11/05/85
4,551,853                   06/548,563                   11/05/85
4,551,856                   06/495,308                   11/05/85
4,876,745                   07/192,912                   10/31/89
4,876,747                   07/190,076                   10/31/89
4,876,750                   07/096,511                   10/31/89
4,876,751                   07/133,356                   10/31/89
4,876,753                   07/271,205                   10/31/89
4,876,754                   07/146,822                   10/31/89
4,876,756                   07/154,454                   10/31/89
4,876,757                   07/211,209                   10/31/89
4,876,760                   07/201,574                   10/31/89
4,876,765                   07/214,865                   10/31/89
4,876,768                   07/317,437                   10/31/89
4,876,769                   07/254,407                   10/31/89
4,876,773                   07/295,897                   10/31/89
4,876,776                   07/109,358                   10/31/89
4,876,780                   07/264,351                   10/31/89
4,876,782                   07/233,332                   10/31/89
4,876,783                   07/064,805                   10/31/89
4,876,791                   07/170,825                   10/31/89
4,876,792                   07/280,448                   10/31/89
4,876,794                   07/218,813                   10/31/89
4,876,799                   07/227,696                   10/31/89
4,876,805                   07/188,907                   10/31/89
4,876,811                   07/157,706                   10/31/89
4,876,815                   07/315,558                   10/31/89
4,876,816                   07/273,264                   10/31/89
4,876,817                   07/209,074                   10/31/89
4,876,819                   07/329,350                   10/31/89
4,876,830                   07/240,618                   10/31/89
4,876,838                   07/304,214                   10/31/89
4,876,840                   07/245,721                   10/31/89
4,876,842                   07/144,094                   10/31/89
4,876,844                   07/354,896                   10/31/89
4,876,851                   07/173,193                   10/31/89
4,876,852                   07/176,279                   10/31/89
4,876,853                   07/011,240                   10/31/89
4,876,855                   06/817,130                   10/31/89
4,876,861                   07/298,963                   10/31/89
4,876,863                   07/215,969                   10/31/89
4,876,864                   07/190,811                   10/31/89
4,876,867                   07/234,026                   10/31/89
4,876,871                   07/250,737                   10/31/89
4,876,872                   07/263,643                   10/31/89
4,876,874                   07/128,112                   10/31/89
4,876,878                   07/172,696                   10/31/89
4,876,880                   07/262,392                   10/31/89
4,876,881                   07/231,767                   10/31/89
4,876,882                   07/302,899                   10/31/89
4,876,885                   07/221,352                   10/31/89
4,876,888                   07/272,425                   10/31/89
4,876,890                   07/213,236                   10/31/89
4,876,900                   07/205,846                   10/31/89
4,876,905                   07/224,083                   10/31/89
4,876,906                   06/932,878                   10/31/89
4,876,911                   07/232,945                   10/31/89
4,876,916                   07/130,413                   10/31/89
4,876,918                   07/217,615                   10/31/89
4,876,920                   07/216,065                   10/31/89
4,876,921                   07/143,486                   10/31/89
4,876,923                   07/217,723                   10/31/89
4,876,924                   07/227,031                   10/31/89
4,876,926                   07/310,159                   10/31/89
4,876,931                   07/217,290                   10/31/89
4,876,943                   07/070,568                   10/31/89
4,876,944                   07/164,061                   10/31/89
4,876,960                   07/280,359                   10/31/89
4,876,961                   07/253,631                   10/31/89
4,876,969                   07/193,908                   10/31/89
4,876,971                   07/237,981                   10/31/89
4,876,974                   07/288,231                   10/31/89
4,876,977                   07/184,851                   10/31/89
4,876,981                   07/106,628                   10/31/89
4,876,986                   07/096,183                   10/31/89
4,876,990                   07/251,906                   10/31/89
4,876,992                   07/234,561                   10/31/89
4,876,997                   07/316,467                   10/31/89
4,876,999                   07/261,779                   10/31/89
4,877,002                   07/133,890                   10/31/89
4,877,007                   07/228,501                   10/31/89
4,877,011                   07/231,200                   10/31/89
4,877,013                   07/131,719                   10/31/89
4,877,017                   07/302,144                   10/31/89
4,877,018                   07/243,042                   10/31/89
4,877,025                   07/254,258                   10/31/89
4,877,028                   07/223,682                   10/31/89
4,877,034                   07/065,015                   10/31/89
4,877,035                   07/257,105                   10/31/89
4,877,038                   07/239,927                   10/31/89
4,877,042                   07/038,179                   10/31/89
4,877,043                   07/191,395                   10/31/89
4,877,044                   07/236,846                   10/31/89
4,877,049                   07/259,362                   10/31/89
4,877,050                   07/264,336                   10/31/89
4,877,051                   07/277,030                   10/31/89
4,877,052                   07/193,405                   10/31/89
4,877,054                   07/304,181                   10/31/89
4,877,055                   07/294,081                   10/31/89
4,877,058                   07/246,700                   10/31/89
4,877,061                   07/207,484                   10/31/89
4,877,066                   07/239,615                   10/31/89
4,877,069                   07/194,981                   10/31/89
4,877,080                   07/206,036                   10/31/89
4,877,082                   07/337,767                   10/31/89
4,877,084                   07/270,839                   10/31/89
4,877,085                   07/289,830                   10/31/89
4,877,086                   07/247,122                   10/31/89
4,877,089                   07/063,420                   10/31/89
4,877,092                   07/181,915                   10/31/89
4,877,095                   07/211,258                   10/31/89
4,877,099                   07/209,162                   10/31/89
4,877,102                   07/215,253                   10/31/89
4,877,109                   07/250,221                   10/31/89
4,877,113                   07/298,604                   10/31/89
4,877,118                   07/122,635                   10/31/89
4,877,123                   07/166,308                   10/31/89
4,877,127                   07/210,178                   10/31/89
4,877,130                   07/202,324                   10/31/89
4,877,131                   07/187,742                   10/31/89
4,877,135                   07/248,724                   10/31/89
4,877,136                   07/182,706                   10/31/89
4,877,139                   07/188,224                   10/31/89
4,877,140                   07/227,084                   10/31/89
4,877,142                   07/203,636                   10/31/89
4,877,145                   07/161,479                   10/31/89
4,877,147                   07/226,901                   10/31/89
4,877,158                   07/180,400                   10/31/89
4,877,159                   07/225,195                   10/31/89
4,877,162                   07/184,599                   10/31/89
4,877,166                   07/189,019                   10/31/89
4,877,169                   07/168,786                   10/31/89
4,877,170                   06/693,532                   10/31/89
4,877,179                   07/176,165                   10/31/89
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