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 October 29, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number                Serial Number               Issue Date

Re. 33,904                    07/660,728                   04/28/92
(4,875,254)                  (07/171,774)                (10/24/89)
Re. 34,182                    07/735,217                   02/23/93
(4,304,192)                  (07/152,608)                (10/24/89)
4,549,325                     06/659,086                   10/29/85
4,549,332                     06/571,197                   10/29/85
4,549,333                     06/603,171                   10/29/85
4,549,338                     06/553,114                   10/29/85
4,549,342                     06/623,844                   10/29/85
4,549,346                     06/506,344                   10/29/85
4,549,354                     06/603,496                   10/29/85
4,549,360                     06/632,228                   10/29/85
4,549,363                     06/576,434                   10/29/85
4,549,371                     06/618,786                   10/29/85
4,549,372                     06/559,007                   10/29/85
4,549,374                     06/690,917                   10/29/85
4,549,376                     06/309,062                   10/29/85
4,549,378                     06/503,715                   10/29/85
4,549,388                     06/531,768                   10/29/85
4,549,389                     06/491,989                   10/29/85
4,549,391                     06/571,751                   10/29/85
4,549,392                     06/607,615                   10/29/85
4,549,393                     06/569,905                   10/29/85
4,549,394                     06/557,137                   10/29/85
4,549,395                     06/583,157                   10/29/85
4,549,407                     06/597,306                   10/29/85
4,549,408                     06/618,687                   10/29/85
4,549,410                     06/684,951                   10/29/85
4,549,411                     06/469,400                   10/29/85
4,549,415                     06/463,620                   10/29/85
4,549,426                     06/641,029                   10/29/85
4,549,428                     06/468,188                   10/29/85
4,549,431                     06/568,303                   10/29/85
4,549,439                     06/622,253                   10/29/85
4,549,451                     06/568,900                   10/29/85
4,549,452                     06/474,612                   10/29/85
4,549,453                     06/564,102                   10/29/85
4,549,457                     06/488,336                   10/29/85
4,549,460                     06/492,258                   10/29/85
4,549,465                     06/568,763                   10/29/85
4,549,469                     06/548,405                   10/29/85
4,549,484                     06/667,676                   10/29/85
4,549,485                     06/478,071                   10/29/85
4,549,498                     06/410,831                   10/29/85
4,549,500                     06/484,133                   10/29/85
4,549,501                     06/611,174                   10/29/85
4,549,505                     06/663,911                   10/29/85
4,549,506                     06/600,414                   10/29/85
4,549,513                     06/420,553                   10/29/85
4,549,514                     06/469,404                   10/29/85
4,549,517                     06/561,094                   10/29/85
4,549,523                     06/647,274                   10/29/85
4,549,529                     06/540,344                   10/29/85
4,549,533                     06/574,930                   10/29/85
4,549,539                     06/507,106                   10/29/85
4,549,540                     06/552,375                   10/29/85
4,549,553                     06/549,027                   10/29/85
4,549,555                     06/581,432                   10/29/85
4,549,559                     06/477,518                   10/29/85
4,549,563                     06/507,066                   10/29/85
4,549,564                     06/663,611                   10/29/85
4,549,567                     06/535,642                   10/29/85
4,549,572                     06/653,556                   10/29/85
4,549,574                     06/607,821                   10/29/85
4,549,578                     06/591,733                   10/29/85
4,549,579                     06/623,643                   10/29/85
4,549,593                     06/564,101                   10/29/85
4,549,596                     06/523,882                   10/29/85
4,549,598                     06/443,683                   10/29/85
4,549,607                     06/514,788                   10/29/85
4,549,613                     06/515,987                   10/29/85
4,549,616                     06/597,457                   10/29/85
4,549,628                     06/481,145                   10/29/85
4,549,632                     06/566,948                   10/29/85
4,549,637                     06/409,478                   10/29/85
4,549,640                     06/460,803                   10/29/85
4,549,641                     06/406,012                   10/29/85
4,549,643                     06/535,598                   10/29/85
4,549,644                     06/504,461                   10/29/85
4,549,647                     06/408,928                   10/29/85
4,549,657                     06/451,170                   10/29/85
4,549,660                     06/456,045                   10/29/85
4,549,662                     06/361,993                   10/29/85
4,549,665                     06/414,554                   10/29/85
4,549,668                     06/630,196                   10/29/85
4,549,672                     06/690,186                   10/29/85
4,549,682                     06/503,551                   10/29/85
4,549,686                     06/605,410                   10/29/85
4,549,687                     06/587,719                   10/29/85
4,549,695                     06/518,564                   10/29/85
4,549,723                     06/629,887                   10/29/85
4,549,727                     06/536,190                   10/29/85
4,549,740                     06/685,641                   10/29/85
4,549,742                     06/528,233                   10/29/85
4,549,743                     06/561,235                   10/29/85
4,549,748                     06/597,700                   10/29/85
4,549,752                     06/613,380                   10/29/85
4,549,764                     06/532,216                   10/29/85
4,549,768                     06/554,774                   10/29/85
4,549,769                     06/632,958                   10/29/85
4,549,770                     06/637,871                   10/29/85
4,549,787                     06/570,097                   10/29/85
4,549,789                     06/462,897                   10/29/85
4,549,790                     06/614,966                   10/29/85
4,549,796                     06/515,877                   10/29/85
4,549,806                     06/432,375                   10/29/85
4,549,813                     06/624,544                   10/29/85
4,549,815                     06/554,014                   10/29/85
4,549,817                     06/551,601                   10/29/85
4,549,830                     06/667,880                   10/29/85
4,549,833                     06/440,435                   10/29/85
4,549,835                     06/554,501                   10/29/85
4,549,836                     06/557,494                   10/29/85
4,549,852                     06/562,056                   10/29/85
4,549,855                     06/698,295                   10/29/85
4,549,860                     06/672,815                   10/29/85
4,549,864                     06/618,247                   10/29/85
4,549,867                     06/382,008                   10/29/85
4,549,875                     06/500,418                   10/29/85
4,549,881                     06/492,197                   10/29/85
4,549,892                     06/506,649                   10/29/85
4,549,894                     06/617,908                   10/29/85
4,549,897                     06/408,774                   10/29/85
4,549,898                     06/501,459                   10/29/85
4,549,906                     06/575,914                   10/29/85
4,549,907                     06/684,330                   10/29/85
4,549,913                     06/574,535                   10/29/85
4,549,916                     06/510,998                   10/29/85
4,549,918                     06/553,895                   10/29/85
4,549,922                     06/605,795                   10/29/85
4,549,927                     06/626,271                   10/29/85
4,549,932                     06/257,947                   10/29/85
4,549,938                     06/592,600                   10/29/85
4,549,940                     06/709,616                   10/29/85
4,549,944                     06/408,906                   10/29/85
4,549,946                     06/608,512                   10/29/85
4,549,949                     06/618,370                   10/29/85
4,549,951                     06/649,434                   10/29/85
4,549,952                     06/537,553                   10/29/85
4,549,953                     06/644,772                   10/29/85
4,549,958                     06/444,275                   10/29/85
4,549,966                     06/618,544                   10/29/85
4,549,967                     06/589,848                   10/29/85
4,549,975                     06/566,083                   10/29/85
4,549,981                     06/419,160                   10/29/85
4,549,984                     06/597,894                   10/29/85
4,549,985                     06/385,785                   10/29/85
4,549,986                     06/565,035                   10/29/85
4,549,987                     06/637,786                   10/29/85
4,549,991                     06/540,997                   10/29/85
4,550,004                     06/557,923                   10/29/85
4,550,005                     06/583,203                   10/29/85
4,550,008                     06/494,693                   10/29/85
4,550,018                     06/655,275                   10/29/85
4,550,020                     06/336,400                   10/29/85
4,550,024                     06/572,373                   10/29/85
4,550,030                     06/650,544                   10/29/85
4,550,032                     06/585,067                   10/29/85
4,550,044                     06/521,125                   10/29/85
4,550,047                     06/501,571                   10/29/85
4,550,052                     06/487,429                   10/29/85
4,550,058                     06/547,344                   10/29/85
4,550,063                     06/601,206                   10/29/85
4,550,064                     06/559,345                   10/29/85
4,550,091                     06/624,047                   10/29/85
4,550,099                     06/658,544                   10/29/85
4,550,100                     06/552,537                   10/29/85
4,550,101                     06/478,494                   10/29/85
4,550,109                     06/615,812                   10/29/85
4,550,115                     06/397,196                   10/29/85
4,550,117                     06/574,112                   10/29/85
4,550,120                     06/605,535                   10/29/85
4,550,122                     06/514,888                   10/29/85
4,550,125                     06/715,807                   10/29/85
4,550,130                     06/584,400                   10/29/85
4,550,132                     06/590,838                   10/29/85
4,550,135                     06/632,860                   10/29/85
4,550,143                     06/616,601                   10/29/85
4,550,147                     06/649,162                   10/29/85
4,550,152                     06/637,468                   10/29/85
4,550,153                     06/665,187                   10/29/85
4,550,155                     06/548,419                   10/29/85
4,550,167                     06/497,027                   10/29/85
4,550,174                     06/622,839                   10/29/85
4,550,177                     06/599,126                   10/29/85
4,550,179                     06/466,573                   10/29/85
4,550,181                     06/624,308                   10/29/85
4,550,182                     06/588,374                   10/29/85
4,550,183                     06/636,884                   10/29/85
4,550,186                     06/512,729                   10/29/85
4,550,189                     06/697,293                   10/29/85
4,550,192                     06/528,711                   10/29/85
4,550,197                     06/656,043                   10/29/85
4,550,220                     06/549,251                   10/29/85
4,550,225                     06/547,170                   10/29/85
4,550,226                     06/648,098                   10/29/85
4,550,228                     06/468,509                   10/29/85
4,550,229                     06/427,813                   10/29/85
4,550,232                     06/515,020                   10/29/85
4,550,235                     06/517,347                   10/29/85
4,550,241                     06/606,573                   10/29/85
4,550,243                     06/545,492                   10/29/85
4,550,248                     06/637,683                   10/29/85
4,550,250                     06/551,147                   10/29/85
4,550,258                     06/515,304                   10/29/85
4,550,261                     06/533,181                   10/29/85
4,550,264                     06/480,585                   10/29/85
4,550,268                     06/499,092                   10/29/85
4,550,269                     06/546,813                   10/29/85
4,550,274                     06/657,464                   10/29/85
4,550,279                     06/530,116                   10/29/85
4,550,280                     06/530,309                   10/29/85
4,550,283                     06/519,971                   10/29/85
4,550,289                     06/453,115                   10/29/85
4,550,291                     06/538,377                   10/29/85
4,550,302                     06/548,135                   10/29/85
4,550,303                     06/597,112                   10/29/85
4,550,304                     06/474,177                   10/29/85
4,550,305                     06/568,049                   10/29/85
4,550,308                     06/486,840                   10/29/85
4,550,310                     06/437,220                   10/29/85
4,550,311                     06/556,915                   10/29/85
4,550,312                     06/557,104                   10/29/85
4,550,317                     06/427,534                   10/29/85
4,550,319                     06/421,466                   10/29/85
4,550,323                     06/501,785                   10/29/85
4,550,324                     06/514,225                   10/29/85
4,550,325                     06/686,454                   10/29/85
4,550,333                     06/531,562                   10/29/85
4,550,334                     06/575,388                   10/29/85
4,550,340                     06/577,506                   10/29/85
4,550,343                     06/621,047                   10/29/85
4,550,344                     06/423,909                   10/29/85
4,550,346                     06/484,998                   10/29/85
4,550,347                     06/482,725                   10/29/85
4,550,359                     06/578,922                   10/29/85
4,550,362                     06/443,772                   10/29/85
4,550,369                     06/495,614                   10/29/85
4,550,373                     06/403,043                   10/29/85
4,550,375                     06/464,375                   10/29/85
4,550,380                     06/562,507                   10/29/85
4,550,386                     06/563,614                   10/29/85
4,550,387                     06/695,425                   10/29/85
4,550,392                     06/355,921                   10/29/85
4,550,398                     06/506,709                   10/29/85
4,550,400                     06/511,612                   10/29/85
4,550,410                     06/369,298                   10/29/85
4,550,422                     06/440,728                   10/29/85
4,550,423                     06/576,905                   10/29/85
4,550,427                     06/438,376                   10/29/85
4,550,428                     06/500,573                   10/29/85
4,550,434                     06/494,445                   10/29/85
4,550,440                     06/523,342                   10/29/85
4,875,238                     07/244,872                   10/24/89
4,875,240                     07/141,116                   10/24/89
4,875,241                     07/257,840                   10/24/89
4,875,244                     07/170,287                   10/24/89
4,875,245                     07/223,685                   10/24/89
4,875,246                     07/223,221                   10/24/89
4,875,248                     07/172,033                   10/24/89
4,875,251                     07/288,480                   10/24/89
4,875,264                     07/316,641                   10/24/89
4,875,269                     07/192,153                   10/24/89
4,875,271                     07/225,057                   10/24/89
4,875,275                     07/129,454                   10/24/89
4,875,277                     07/256,883                   10/24/89
4,875,278                     07/145,053                   10/24/89
4,875,280                     07/273,722                   10/24/89
4,875,284                     07/168,056                   10/24/89
4,875,290                     07/226,945                   10/24/89
4,875,292                     06/849,537                   10/24/89
4,875,293                     07/121,348                   10/24/89
4,875,297                     07/206,679                   10/24/89
4,875,298                     07/258,011                   10/24/89
4,875,299                     07/224,278                   10/24/89
4,875,305                     07/311,748                   10/24/89
4,875,307                     07/244,272                   10/24/89
4,875,309                     07/134,092                   10/24/89
4,875,311                     07/183,972                   10/24/89
4,875,312                     07/152,825                   10/24/89
4,875,313                     07/196,325                   10/24/89
4,875,316                     07/031,527                   10/24/89
4,875,317                     07/161,194                   10/24/89
4,875,322                     07/123,173                   10/24/89
4,875,326                     07/169,521                   10/24/89
4,875,327                     07/277,642                   10/24/89
4,875,329                     07/116,485                   10/24/89
4,875,338                     07/139,385                   10/24/89
4,875,341                     07/278,683                   10/24/89
4,875,352                     07/048,441                   10/24/89
4,875,353                     07/265,487                   10/24/89
4,875,354                     07/104,011                   10/24/89
4,875,357                     07/154,565                   10/24/89
4,875,358                     07/053,203                   10/24/89
4,875,361                     07/186,190                   10/24/89
4,875,363                     07/228,373                   10/24/89
4,875,367                     07/260,298                   10/24/89
4,875,374                     07/189,719                   10/24/89
4,875,377                     07/115,054                   10/24/89
4,875,378                     07/150,150                   10/24/89
4,875,379                     07/263,064                   10/24/89
4,875,380                     07/136,849                   10/24/89
4,875,381                     07/158,765                   10/24/89
4,875,382                     07/152,074                   10/24/89
4,875,396                     07/170,163                   10/24/89
4,875,401                     07/238,469                   10/24/89
4,875,403                     07/259,322                   10/24/89
4,875,417                     07/087,781                   10/24/89
4,875,419                     07/245,575                   10/24/89
4,875,425                     07/125,176                   10/24/89
4,875,431                     07/237,235                   10/24/89
4,875,432                     07/258,798                   10/24/89
4,875,446                     07/177,913                   10/24/89
4,875,449                     07/259,971                   10/24/89
4,875,455                     07/180,781                   10/24/89
4,875,464                     07/233,461                   10/24/89
4,875,467                     07/225,444                   10/24/89
4,875,469                     07/206,269                   10/24/89
4,875,471                     07/167,914                   10/24/89
4,875,476                     07/158,559                   10/24/89
4,875,479                     07/191,149                   10/24/89
4,875,484                     07/103,010                   10/24/89
4,875,492                     07/190,666                   10/24/89
4,875,503                     07/190,565                   10/24/89
4,875,506                     07/193,346                   10/24/89
4,875,507                     07/129,164                   10/24/89
4,875,513                     07/183,154                   10/24/89
4,875,514                     07/261,637                   10/24/89
4,875,519                     07/185,436                   10/24/89
4,875,522                     07/340,059                   10/24/89
4,875,523                     07/256,454                   10/24/89
4,875,524                     07/250,900                   10/24/89
4,875,525                     07/318,867                   10/24/89
4,875,529                     07/133,174                   10/24/89
4,875,531                     07/148,676                   10/24/89
4,875,536                     07/221,997                   10/24/89
4,875,537                     07/190,390                   10/24/89
4,875,539                     07/176,151                   10/24/89
4,875,544                     07/306,633                   10/24/89
4,875,550                     07/283,683                   10/24/89
4,875,553                     07/214,478                   10/24/89
4,875,557                     07/285,197                   10/24/89
4,875,567                     07/076,208                   10/24/89
4,875,568                     07/294,532                   10/24/89
4,875,570                     07/189,425                   10/24/89
4,875,572                     07/097,449                   10/24/89
4,875,573                     07/217,467                   10/24/89
4,875,574                     07/315,089                   10/24/89
4,875,575                     07/237,243                   10/24/89
4,875,576                     07/152,898                   10/24/89
4,875,589                     07/159,218                   10/24/89
4,875,590                     07/118,859                   10/24/89
4,875,592                     07/259,335                   10/24/89
4,875,593                     07/161,147                   10/24/89
4,875,598                     07/215,045                   10/24/89
4,875,611                     07/131,066                   10/24/89
4,875,617                     07/219,333                   10/24/89
4,875,628                     07/191,077                   10/24/89
4,875,629                     07/240,841                   10/24/89
4,875,630                     07/255,325                   10/24/89
4,875,634                     07/223,782                   10/24/89
4,875,635                     07/104,814                   10/24/89
4,875,636                     07/119,519                   10/24/89
4,875,637                     07/296,467                   10/24/89
4,875,638                     07/296,558                   10/24/89
4,875,639                     07/224,577                   10/24/89
4,875,641                     07/179,310                   10/24/89
4,875,650                     07/211,854                   10/24/89
4,875,653                     07/260,014                   10/24/89
4,875,659                     07/243,847                   10/24/89
4,875,661                     07/220,699                   10/24/89
4,875,662                     07/266,371                   10/24/89
4,875,673                     07/126,470                   10/24/89
4,875,678                     07/187,451                   10/24/89
4,875,679                     07/134,148                   10/24/89
4,875,681                     07/199,029                   10/24/89
4,875,686                     07/120,373                   10/24/89
4,875,687                     07/265,256                   10/24/89
4,875,694                     06/700,530                   10/24/89
4,875,695                     07/204,187                   10/24/89
4,875,704                     07/181,614                   10/24/89
4,875,728                     07/245,232                   10/24/89
4,875,730                     07/255,990                   10/24/89
4,875,733                     07/166,099                   10/24/89
4,875,754                     07/090,790                   10/24/89
4,875,756                     07/249,819                   10/24/89
4,875,763                     06/937,968                   10/24/89
4,875,765                     07/226,339                   10/24/89
4,875,768                     07/176,755                   10/24/89
4,875,772                     07/253,088                   10/24/89
4,875,773                     07/191,262                   10/24/89
4,875,797                     07/207,116                   10/24/89
4,875,803                     07/220,078                   10/24/89
4,875,805                     07/240,527                   10/24/89
4,875,822                     07/204,454                   10/24/89
4,875,824                     07/150,784                   10/24/89
4,875,828                     07/281,531                   10/24/89
4,875,834                     07/157,782                   10/24/89
4,875,841                     07/304,924                   10/24/89
4,875,852                     07/176,721                   10/24/89
4,875,853                     07/300,703                   10/24/89
4,875,855                     07/123,888                   10/24/89
4,875,858                     07/222,686                   10/24/89
4,875,860                     07/266,579                   10/24/89
4,875,869                     07/170,146                   10/24/89
4,875,874                     07/266,826                   10/24/89
4,875,886                     07/246,691                   10/24/89
4,875,888                     07/249,419                   10/24/89
4,875,892                     07/298,971                   10/24/89
4,875,893                     07/248,015                   10/24/89
4,875,894                     07/241,268                   10/24/89
4,875,896                     07/237,326                   10/24/89
4,875,897                     07/180,728                   10/24/89
4,875,903                     07/058,434                   10/24/89
4,875,904                     07/187,314                   10/24/89
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