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 March 25, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,217                  06/759,131                   07/29/86
(4,577,774)                (06/711,010)                (03/25/86)
Re. 33,774                  07/554,457                   12/24/91
(4,908,951)                (07/317,617)                (03/20/90)
Re. 34,362                  07/570,999                   08/31/93
(4,577,956)                (06/500,710)                (03/25/86)
4,577,354                   06/639,572                   03/25/86
4,577,361                   06/617,851                   03/25/86
4,577,368                   06/644,514                   03/25/86
4,577,373                   06/669,472                   03/25/86
4,577,376                   06/522,056                   03/25/86
4,577,377                   06/609,426                   03/25/86
4,577,389                   06/486,419                   03/25/86
4,577,390                   06/468,920                   03/25/86
4,577,396                   06/610,485                   03/25/86
4,577,401                   06/520,209                   03/25/86
4,577,402                   06/620,141                   03/25/86
4,577,407                   06/624,297                   03/25/86
4,577,410                   06/743,447                   03/25/86
4,577,414                   06/728,976                   03/25/86
4,577,431                   06/606,110                   03/25/86
4,577,435                   06/545,072                   03/25/86
4,577,447                   06/503,358                   03/25/86
4,577,452                   06/527,308                   03/25/86
4,577,454                   06/615,752                   03/25/86
4,577,471                   06/383,450                   03/25/86
4,577,473                   06/661,327                   03/25/86
4,577,482                   06/621,754                   03/25/86
4,577,483                   06/575,607                   03/25/86
4,577,486                   06/494,397                   03/25/86
4,577,492                   06/652,155                   03/25/86
4,577,494                   06/524,724                   03/25/86
4,577,500                   06/636,629                   03/25/86
4,577,503                   06/646,406                   03/25/86
4,577,527                   06/544,514                   03/25/86
4,577,528                   06/687,591                   03/25/86
4,577,529                   06/412,852                   03/25/86
4,577,531                   06/585,891                   03/25/86
4,577,533                   06/605,928                   03/25/86
4,577,539                   06/609,688                   03/25/86
4,577,544                   06/609,632                   03/25/86
4,577,547                   06/529,884                   03/25/86
4,577,548                   06/701,895                   03/25/86
4,577,561                   06/369,749                   03/25/86
4,577,565                   06/677,374                   03/25/86
4,577,574                   06/594,774                   03/25/86
4,577,576                   06/644,126                   03/25/86
4,577,581                   06/536,159                   03/25/86
4,577,583                   06/625,799                   03/25/86
4,577,587                   06/717,012                   03/25/86
4,577,594                   06/704,269                   03/25/86
4,577,600                   06/658,884                   03/25/86
4,577,602                   06/589,869                   03/25/86
4,577,609                   06/679,576                   03/25/86
4,577,617                   06/673,033                   03/25/86
4,577,618                   06/637,699                   03/25/86
4,577,632                   06/577,649                   03/25/86
4,577,634                   06/751,602                   03/25/86
4,577,636                   06/574,682                   03/25/86
4,577,639                   06/669,290                   03/25/86
4,577,642                   06/706,215                   03/25/86
4,577,647                   06/667,330                   03/25/86
4,577,657                   06/589,177                   03/25/86
4,577,662                   06/574,237                   03/25/86
4,577,664                   06/601,278                   03/25/86
4,577,670                   06/632,352                   03/25/86
4,577,673                   06/513,092                   03/25/86
4,577,674                   06/516,280                   03/25/86
4,577,675                   06/519,713                   03/25/86
4,577,680                   06/613,110                   03/25/86
4,577,682                   06/645,999                   03/25/86
4,577,684                   06/640,396                   03/25/86
4,577,687                   06/583,864                   03/25/86
4,577,693                   06/691,554                   03/25/86
4,577,705                   06/602,771                   03/25/86
4,577,712                   06/645,821                   03/25/86
4,577,727                   06/504,784                   03/25/86
4,577,729                   06/678,522                   03/25/86
4,577,735                   06/627,248                   03/25/86
4,577,743                   06/639,353                   03/25/86
4,577,746                   06/712,475                   03/25/86
4,577,747                   06/706,698                   03/25/86
4,577,750                   06/755,149                   03/25/86
4,577,758                   06/735,799                   03/25/86
4,577,775                   06/679,949                   03/25/86
4,577,780                   06/451,035                   03/25/86
4,577,791                   06/604,729                   03/25/86
4,577,792                   06/719,096                   03/25/86
4,577,800                   06/701,812                   03/25/86
4,577,802                   06/763,314                   03/25/86
4,577,803                   06/577,883                   03/25/86
4,577,818                   06/672,442                   03/25/86
4,577,825                   06/522,604                   03/25/86
4,577,830                   06/770,621                   03/25/86
4,577,833                   06/588,450                   03/25/86
4,577,839                   06/569,032                   03/25/86
4,577,845                   06/569,217                   03/25/86
4,577,850                   06/613,009                   03/25/86
4,577,852                   06/648,899                   03/25/86
4,577,859                   06/537,524                   03/25/86
4,577,861                   06/617,081                   03/25/86
4,577,864                   06/741,967                   03/25/86
4,577,865                   06/620,289                   03/25/86
4,577,868                   06/598,459                   03/25/86
4,577,873                   06/717,834                   03/25/86
4,577,875                   06/437,615                   03/25/86
4,577,883                   06/630,702                   03/25/86
4,577,889                   06/602,600                   03/25/86
4,577,893                   06/607,325                   03/25/86
4,577,896                   06/411,687                   03/25/86
4,577,899                   06/638,692                   03/25/86
4,577,906                   06/626,375                   03/25/86
4,577,911                   06/780,281                   03/25/86
4,577,914                   06/610,699                   03/25/86
4,577,918                   06/606,086                   03/25/86
4,577,921                   06/641,678                   03/25/86
4,577,922                   06/719,944                   03/25/86
4,577,926                   06/537,478                   03/25/86
4,577,927                   06/472,731                   03/25/86
4,577,932                   06/608,222                   03/25/86
4,577,933                   06/561,860                   03/25/86
4,577,935                   06/347,032                   03/25/86
4,577,949                   06/678,004                   03/25/86
4,577,950                   06/630,825                   03/25/86
4,577,960                   06/643,121                   03/25/86
4,577,972                   06/435,167                   03/25/86
4,577,973                   06/580,556                   03/25/86
4,577,983                   06/626,162                   03/25/86
4,577,985                   06/566,917                   03/25/86
4,577,993                   06/704,379                   03/25/86
4,577,996                   06/628,942                   03/25/86
4,577,997                   06/511,793                   03/25/86
4,577,999                   06/553,143                   03/25/86
4,578,006                   06/544,181                   03/25/86
4,578,014                   06/552,607                   03/25/86
4,578,015                   06/505,055                   03/25/86
4,578,020                   06/782,189                   03/25/86
4,578,021                   06/547,492                   03/25/86
4,578,028                   06/678,623                   03/25/86
4,578,030                   06/623,966                   03/25/86
4,578,039                   06/556,963                   03/25/86
4,578,046                   06/476,822                   03/25/86
4,578,057                   06/645,849                   03/25/86
4,578,059                   06/607,411                   03/25/86
4,578,064                   06/563,768                   03/25/86
4,578,072                   06/559,597                   03/25/86
4,578,080                   06/530,302                   03/25/86
4,578,090                   06/660,875                   03/25/86
4,578,095                   06/642,103                   03/25/86
4,578,099                   06/600,188                   03/25/86
4,578,100                   06/718,755                   03/25/86
4,578,107                   06/619,149                   03/25/86
4,578,109                   06/735,229                   03/25/86
4,578,111                   06/730,120                   03/25/86
4,578,112                   06/490,517                   03/25/86
4,578,117                   06/623,762                   03/25/86
4,578,119                   06/549,498                   03/25/86
4,578,121                   06/647,737                   03/25/86
4,578,136                   06/608,266                   03/25/86
4,578,138                   06/596,334                   03/25/86
4,578,154                   06/746,010                   03/25/86
4,578,160                   06/590,668                   03/25/86
4,578,164                   06/637,728                   03/25/86
4,578,165                   06/544,160                   03/25/86
4,578,166                   06/484,459                   03/25/86
4,578,177                   06/645,175                   03/25/86
4,578,180                   06/596,983                   03/25/86
4,578,185                   06/758,439                   03/25/86
4,578,187                   06/625,959                   03/25/86
4,578,190                   06/665,411                   03/25/86
4,578,191                   06/519,315                   03/25/86
4,578,194                   06/692,624                   03/25/86
4,578,201                   06/586,504                   03/25/86
4,578,202                   06/564,458                   03/25/86
4,578,203                   06/481,418                   03/25/86
4,578,204                   06/602,543                   03/25/86
4,578,206                   06/619,975                   03/25/86
4,578,209                   06/703,456                   03/25/86
4,578,214                   06/577,643                   03/25/86
4,578,223                   06/659,104                   03/25/86
4,578,229                   06/436,303                   03/25/86
4,578,236                   06/377,015                   03/25/86
4,578,239                   06/623,631                   03/25/86
4,578,240                   06/454,927                   03/25/86
4,578,242                   06/627,737                   03/25/86
4,578,246                   06/591,212                   03/25/86
4,578,251                   06/718,244                   03/25/86
4,578,252                   06/734,008                   03/25/86
4,578,257                   06/720,811                   03/25/86
4,578,277                   06/730,012                   03/25/86
4,578,280                   06/583,727                   03/25/86
4,578,291                   06/681,642                   03/25/86
4,578,294                   06/578,680                   03/25/86
4,578,313                   06/536,855                   03/25/86
4,578,314                   06/651,219                   03/25/86
4,578,315                   06/766,019                   03/25/86
4,578,319                   06/782,262                   03/25/86
4,578,324                   06/658,015                   03/25/86
4,578,325                   06/581,270                   03/25/86
4,578,343                   06/717,477                   03/25/86
4,578,352                   06/513,517                   03/25/86
4,578,373                   06/647,323                   03/25/86
4,578,378                   06/625,308                   03/25/86
4,578,391                   06/457,636                   03/25/86
4,578,392                   06/586,928                   03/25/86
4,578,395                   06/616,515                   03/25/86
4,578,396                   06/498,606                   03/25/86
4,578,400                   06/680,593                   03/25/86
4,578,401                   06/491,337                   03/25/86
4,578,403                   06/619,184                   03/25/86
4,578,404                   06/597,601                   03/25/86
4,578,405                   06/738,920                   03/25/86
4,578,409                   06/691,102                   03/25/86
4,578,412                   06/710,263                   03/25/86
4,578,418                   06/688,024                   03/25/86
4,578,420                   06/233,292                   03/25/86
4,578,425                   06/701,205                   03/25/86
4,578,427                   06/694,366                   03/25/86
4,578,434                   06/722,028                   03/25/86
4,578,435                   06/721,973                   03/25/86
4,578,442                   06/510,687                   03/25/86
4,578,445                   06/716,460                   03/25/86
4,578,448                   06/561,144                   03/25/86
4,578,454                   06/608,081                   03/25/86
4,578,463                   06/632,136                   03/25/86
4,578,469                   06/655,307                   03/25/86
4,578,470                   06/505,636                   03/25/86
4,578,471                   06/677,624                   03/25/86
4,578,476                   06/621,934                   03/25/86
4,578,485                   06/577,641                   03/25/86
4,578,486                   06/748,371                   03/25/86
4,578,496                   06/543,720                   03/25/86
4,578,498                   06/515,465                   03/25/86
4,578,500                   06/553,722                   03/25/86
4,578,502                   06/693,248                   03/25/86
4,578,505                   06/647,090                   03/25/86
4,578,507                   06/694,211                   03/25/86
4,578,508                   06/705,880                   03/25/86
4,578,510                   06/680,441                   03/25/86
4,578,511                   06/587,896                   03/25/86
4,578,513                   06/672,038                   03/25/86
4,578,526                   06/636,245                   03/25/86
4,578,529                   06/637,248                   03/25/86
4,578,534                   06/643,450                   03/25/86
4,578,539                   06/521,667                   03/25/86
4,578,543                   06/451,227                   03/25/86
4,578,549                   06/645,845                   03/25/86
4,578,553                   06/488,523                   03/25/86
4,578,560                   06/532,937                   03/25/86
4,578,563                   06/660,509                   03/25/86
4,578,566                   06/738,279                   03/25/86
4,578,572                   06/505,234                   03/25/86
4,578,582                   06/435,203                   03/25/86
4,578,583                   06/596,483                   03/25/86
4,578,584                   06/573,075                   03/25/86
4,578,587                   06/694,888                   03/25/86
4,578,590                   06/490,614                   03/25/86
4,578,594                   06/573,532                   03/25/86
4,578,599                   06/500,594                   03/25/86
4,578,602                   06/512,269                   03/25/86
4,578,604                   06/590,040                   03/25/86
4,578,605                   06/543,935                   03/25/86
4,578,607                   06/664,964                   03/25/86
4,578,612                   06/650,484                   03/25/86
4,578,619                   06/506,841                   03/25/86
4,578,620                   06/626,467                   03/25/86
4,578,626                   06/714,344                   03/25/86
4,578,628                   06/688,950                   03/25/86
4,578,640                   06/418,187                   03/25/86
4,578,643                   06/553,346                   03/25/86
4,578,644                   06/540,074                   03/25/86
4,578,646                   06/577,972                   03/25/86
4,578,649                   06/697,991                   03/25/86
4,578,651                   06/427,058                   03/25/86
4,578,652                   06/609,614                   03/25/86
4,578,656                   06/568,432                   03/25/86
4,578,661                   06/689,541                   03/25/86
4,578,663                   06/676,503                   03/25/86
4,578,672                   06/499,768                   03/25/86
4,578,678                   06/551,536                   03/25/86
4,578,696                   06/554,656                   03/25/86
4,578,699                   06/555,863                   03/25/86
4,578,701                   06/518,837                   03/25/86
4,578,711                   06/566,365                   03/25/86
4,578,713                   06/633,120                   03/25/86
4,578,715                   06/579,329                   03/25/86
4,578,720                   06/518,897                   03/25/86
4,578,722                   06/452,548                   03/25/86
4,578,723                   06/504,552                   03/25/86
4,578,727                   06/583,558                   03/25/86
4,578,732                   06/561,608                   03/25/86
4,578,739                   06/486,474                   03/25/86
4,578,740                   06/596,467                   03/25/86
4,578,753                   06/527,472                   03/25/86
4,578,754                   06/596,877                   03/25/86
4,578,757                   06/469,364                   03/25/86
4,578,760                   06/459,671                   03/25/86
4,578,764                   06/472,642                   03/25/86
4,578,767                   06/307,811                   03/25/86
4,578,779                   06/624,486                   03/25/86
4,578,803                   06/590,533                   03/25/86
4,578,805                   06/659,355                   03/25/86
4,578,817                   06/449,215                   03/25/86
4,578,818                   06/728,154                   03/25/86
4,578,820                   06/586,546                   03/25/86
4,908,878                   07/304,322                   03/20/90
4,908,879                   07/262,697                   03/20/90
4,908,880                   07/182,473                   03/20/90
4,908,886                   07/281,557                   03/20/90
4,908,889                   07/364,828                   03/20/90
4,908,891                   07/248,982                   03/20/90
4,908,897                   07/309,705                   03/20/90
4,908,899                   07/313,593                   03/20/90
4,908,911                   07/205,663                   03/20/90
4,908,913                   07/387,989                   03/20/90
4,908,919                   07/141,266                   03/20/90
4,908,921                   07/227,848                   03/20/90
4,908,932                   07/260,112                   03/20/90
4,908,948                   07/213,326                   03/20/90
4,908,949                   07/257,821                   03/20/90
4,908,952                   07/382,350                   03/20/90
4,908,953                   07/100,394                   03/20/90
4,908,965                   07/249,650                   03/20/90
4,908,967                   07/285,592                   03/20/90
4,908,969                   07/313,379                   03/20/90
4,908,979                   07/365,471                   03/20/90
4,908,982                   07/335,693                   03/20/90
4,908,987                   07/282,591                   03/20/90
4,908,990                   07/257,860                   03/20/90
4,908,991                   07/360,233                   03/20/90
4,908,992                   07/219,547                   03/20/90
4,908,996                   07/099,915                   03/20/90
4,908,999                   07/192,915                   03/20/90
4,909,004                   07/112,618                   03/20/90
4,909,006                   07/361,338                   03/20/90
4,909,014                   07/287,121                   03/20/90
4,909,015                   07/259,562                   03/20/90
4,909,018                   07/193,272                   03/20/90
4,909,019                   07/192,922                   03/20/90
4,909,021                   07/278,495                   03/20/90
4,909,022                   07/207,507                   03/20/90
4,909,031                   07/199,901                   03/20/90
4,909,035                   07/157,066                   03/20/90
4,909,036                   07/327,731                   03/20/90
4,909,041                   07/303,141                   03/20/90
4,909,044                   07/350,131                   03/20/90
4,909,045                   07/096,501                   03/20/90
4,909,047                   07/156,346                   03/20/90
4,909,053                   07/195,554                   03/20/90
4,909,058                   07/196,852                   03/20/90
4,909,059                   07/250,976                   03/20/90
4,909,065                   07/337,982                   03/20/90
4,909,067                   07/264,267                   03/20/90
4,909,069                   07/379,721                   03/20/90
4,909,073                   07/263,948                   03/20/90
4,909,074                   07/289,495                   03/20/90
4,909,076                   07/228,240                   03/20/90
4,909,077                   07/380,811                   03/20/90
4,909,081                   07/304,538                   03/20/90
4,909,085                   07/313,942                   03/20/90
4,909,090                   07/341,883                   03/20/90
4,909,093                   07/201,652                   03/20/90
4,909,097                   07/181,958                   03/20/90
4,909,099                   07/276,911                   03/20/90
4,909,101                   07/195,724                   03/20/90
4,909,104                   07/172,559                   03/20/90
4,909,106                   07/295,736                   03/20/90
4,909,110                   07/149,429                   03/20/90
4,909,112                   07/086,390                   03/20/90
4,909,117                   07/333,879                   03/20/90
4,909,120                   07/239,190                   03/20/90
4,909,123                   07/269,685                   03/20/90
4,909,128                   07/277,592                   03/20/90
4,909,138                   07/345,989                   03/20/90
4,909,139                   07/217,622                   03/20/90
4,909,143                   07/254,824                   03/20/90
4,909,150                   07/065,895                   03/20/90
4,909,152                   07/226,239                   03/20/90
4,909,155                   07/239,614                   03/20/90
4,909,161                   07/337,464                   03/20/90
4,909,163                   07/289,180                   03/20/90
4,909,164                   07/282,838                   03/20/90
4,909,171                   07/362,876                   03/20/90
4,909,179                   07/185,416                   03/20/90
4,909,181                   07/259,061                   03/20/90
4,909,182                   07/346,640                   03/20/90
4,909,187                   07/148,793                   03/20/90
4,909,188                   07/301,316                   03/20/90
4,909,194                   07/383,382                   03/20/90
4,909,214                   07/210,584                   03/20/90
4,909,215                   07/368,973                   03/20/90
4,909,216                   07/236,351                   03/20/90
4,909,230                   07/257,695                   03/20/90
4,909,233                   07/306,087                   03/20/90
4,909,234                   07/361,503                   03/20/90
4,909,239                   06/726,590                   03/20/90
4,909,240                   07/165,549                   03/20/90
4,909,250                   07/270,210                   03/20/90
4,909,252                   07/199,128                   03/20/90
4,909,255                   07/247,452                   03/20/90
4,909,256                   07/121,306                   03/20/90
4,909,257                   07/346,346                   03/20/90
4,909,262                   07/304,167                   03/20/90
4,909,263                   07/264,019                   03/20/90
4,909,265                   07/238,246                   03/20/90
4,909,268                   07/270,970                   03/20/90
4,909,271                   07/337,924                   03/20/90
4,909,275                   07/115,205                   03/20/90
4,909,282                   07/266,780                   03/20/90
4,909,283                   07/239,679                   03/20/90
4,909,289                   07/073,279                   03/20/90
4,909,293                   07/352,398                   03/20/90
4,909,301                   07/258,013                   03/20/90
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