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 June 17, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,666                  07/064,949                   05/17/88
(4,594,751)                (06/486,948)                (06/17/86)
Re. 33,037                  07/145,157                   08/29/89
(4,595,175)                (06/718,971)                (06/17/86)
Re. 33,400                  07/207,133                   10/23/90
(4,595,895)                (06/751,252)                (06/17/86)
Re. 34,219                  07/591,789                   04/13/93
(4,933,981)                (07/333,335)                (06/12/90)
4,594,742                   06/448,417                   06/17/86
4,594,753                   06/535,797                   06/17/86
4,594,762                   06/703,350                   06/17/86
4,594,778                   06/713,521                   06/17/86
4,594,784                   06/622,555                   06/17/86
4,594,800                   06/754,471                   06/17/86
4,594,801                   06/693,912                   06/17/86
4,594,806                   06/739,193                   06/17/86
4,594,821                   06/706,236                   06/17/86
4,594,827                   06/779,591                   06/17/86
4,594,835                   06/536,450                   06/17/86
4,594,843                   06/647,516                   06/17/86
4,594,856                   06/707,847                   06/17/86
4,594,858                   06/636,068                   06/17/86
4,594,860                   06/653,792                   06/17/86
4,594,865                   06/678,748                   06/17/86
4,594,875                   06/652,771                   06/17/86
4,594,881                   06/686,845                   06/17/86
4,594,886                   06/707,555                   06/17/86
4,594,894                   06/647,519                   06/17/86
4,594,895                   06/651,963                   06/17/86
4,594,896                   06/659,798                   06/17/86
4,594,901                   06/669,966                   06/17/86
4,594,905                   06/673,698                   06/17/86
4,594,913                   06/581,319                   06/17/86
4,594,915                   06/469,827                   06/17/86
4,594,917                   06/680,606                   06/17/86
4,594,918                   06/632,801                   06/17/86
4,594,919                   06/553,053                   06/17/86
4,594,920                   06/665,780                   06/17/86
4,594,925                   06/671,224                   06/17/86
4,594,928                   06/575,295                   06/17/86
4,594,932                   06/633,865                   06/17/86
4,594,936                   06/668,436                   06/17/86
4,594,937                   06/701,900                   06/17/86
4,594,942                   06/701,035                   06/17/86
4,594,946                   06/726,426                   06/17/86
4,594,952                   06/657,172                   06/17/86
4,594,958                   06/696,729                   06/17/86
4,594,961                   06/676,116                   06/17/86
4,594,963                   06/657,227                   06/17/86
4,594,968                   06/586,278                   06/17/86
4,594,973                   06/748,281                   06/17/86
4,594,984                   06/755,213                   06/17/86
4,594,986                   06/692,639                   06/17/86
4,594,993                   06/529,533                   06/17/86
4,594,995                   06/680,273                   06/17/86
4,594,997                   06/670,832                   06/17/86
4,595,018                   06/617,936                   06/17/86
4,595,019                   06/606,981                   06/17/86
4,595,041                   06/635,667                   06/17/86
4,595,051                   06/599,686                   06/17/86
4,595,055                   06/608,057                   06/17/86
4,595,056                   06/593,438                   06/17/86
4,595,059                   06/661,152                   06/17/86
4,595,065                   06/567,847                   06/17/86
4,595,078                   06/703,851                   06/17/86
4,595,083                   06/672,962                   06/17/86
4,595,084                   06/661,496                   06/17/86
4,595,108                   06/460,385                   06/17/86
4,595,119                   06/744,416                   06/17/86
4,595,139                   06/670,166                   06/17/86
4,595,142                   06/667,426                   06/17/86
4,595,149                   06/652,776                   06/17/86
4,595,164                   06/672,896                   06/17/86
4,595,178                   06/687,634                   06/17/86
4,595,180                   06/657,982                   06/17/86
4,595,182                   06/568,370                   06/17/86
4,595,187                   06/760,208                   06/17/86
4,595,189                   06/451,800                   06/17/86
4,595,196                   06/541,355                   06/17/86
4,595,200                   06/621,632                   06/17/86
4,595,201                   06/561,595                   06/17/86
4,595,202                   06/621,513                   06/17/86
4,595,206                   06/701,788                   06/17/86
4,595,219                   06/462,382                   06/17/86
4,595,222                   06/655,253                   06/17/86
4,595,224                   06/628,820                   06/17/86
4,595,233                   06/621,941                   06/17/86
4,595,234                   06/662,568                   06/17/86
4,595,238                   06/654,150                   06/17/86
4,595,243                   06/649,244                   06/17/86
4,595,245                   06/624,966                   06/17/86
4,595,247                   06/558,819                   06/17/86
4,595,248                   06/487,448                   06/17/86
4,595,249                   06/689,041                   06/17/86
4,595,254                   06/497,211                   06/17/86
4,595,256                   06/482,358                   06/17/86
4,595,259                   06/572,023                   06/17/86
4,595,261                   06/541,604                   06/17/86
4,595,266                   06/609,542                   06/17/86
4,595,273                   06/595,359                   06/17/86
4,595,280                   06/556,298                   06/17/86
4,595,310                   06/688,635                   06/17/86
4,595,324                   06/425,163                   06/17/86
4,595,328                   06/492,212                   06/17/86
4,595,334                   06/572,086                   06/17/86
4,595,352                   06/691,907                   06/17/86
4,595,356                   06/497,177                   06/17/86
4,595,357                   06/730,282                   06/17/86
4,595,359                   06/638,475                   06/17/86
4,595,370                   06/770,705                   06/17/86
4,595,375                   06/551,835                   06/17/86
4,595,377                   06/679,711                   06/17/86
4,595,405                   06/684,655                   06/17/86
4,595,417                   06/665,850                   06/17/86
4,595,430                   06/607,773                   06/17/86
4,595,444                   06/551,748                   06/17/86
4,595,447                   06/680,136                   06/17/86
4,595,460                   06/531,289                   06/17/86
4,595,464                   06/757,364                   06/17/86
4,595,467                   06/759,886                   06/17/86
4,595,473                   06/645,089                   06/17/86
4,595,484                   06/803,190                   06/17/86
4,595,499                   06/784,904                   06/17/86
4,595,505                   06/615,480                   06/17/86
4,595,507                   06/637,639                   06/17/86
4,595,530                   06/590,357                   06/17/86
4,595,531                   06/602,279                   06/17/86
4,595,532                   06/718,127                   06/17/86
4,595,544                   06/604,914                   06/17/86
4,595,545                   06/454,718                   06/17/86
4,595,554                   06/669,193                   06/17/86
4,595,555                   06/580,285                   06/17/86
4,595,567                   06/687,359                   06/17/86
4,595,569                   06/691,114                   06/17/86
4,595,571                   06/647,994                   06/17/86
4,595,581                   06/741,490                   06/17/86
4,595,584                   06/689,405                   06/17/86
4,595,585                   06/601,355                   06/17/86
4,595,588                   06/613,640                   06/17/86
4,595,592                   06/676,203                   06/17/86
4,595,594                   06/533,821                   06/17/86
4,595,604                   06/631,973                   06/17/86
4,595,605                   06/631,972                   06/17/86
4,595,606                   06/631,974                   06/17/86
4,595,607                   06/762,626                   06/17/86
4,595,612                   06/739,486                   06/17/86
4,595,620                   06/633,735                   06/17/86
4,595,622                   06/708,678                   06/17/86
4,595,625                   06/645,625                   06/17/86
4,595,636                   06/724,000                   06/17/86
4,595,637                   06/544,668                   06/17/86
4,595,639                   06/647,885                   06/17/86
4,595,653                   06/709,062                   06/17/86
4,595,656                   06/568,698                   06/17/86
4,595,663                   06/569,394                   06/17/86
4,595,664                   06/578,756                   06/17/86
4,595,667                   06/722,821                   06/17/86
4,595,672                   06/680,379                   06/17/86
4,595,673                   06/676,444                   06/17/86
4,595,680                   06/599,341                   06/17/86
4,595,682                   06/554,812                   06/17/86
4,595,692                   06/735,250                   06/17/86
4,595,698                   06/500,396                   06/17/86
4,595,700                   06/703,973                   06/17/86
4,595,701                   06/685,893                   06/17/86
4,595,706                   06/773,901                   06/17/86
4,595,707                   06/700,791                   06/17/86
4,595,721                   06/617,070                   06/17/86
4,595,732                   06/604,570                   06/17/86
4,595,733                   06/650,866                   06/17/86
4,595,742                   06/708,028                   06/17/86
4,595,748                   06/661,201                   06/17/86
4,595,751                   06/713,797                   06/17/86
4,595,758                   06/677,614                   06/17/86
4,595,763                   06/507,910                   06/17/86
4,595,764                   06/633,701                   06/17/86
4,595,777                   06/707,881                   06/17/86
4,595,780                   06/568,072                   06/17/86
4,595,788                   06/674,786                   06/17/86
4,595,789                   06/604,915                   06/17/86
4,595,806                   06/679,294                   06/17/86
4,595,807                   06/712,372                   06/17/86
4,595,815                   06/550,151                   06/17/86
4,595,822                   06/620,067                   06/17/86
4,595,826                   06/637,316                   06/17/86
4,595,836                   06/626,368                   06/17/86
4,595,847                   06/543,747                   06/17/86
4,595,851                   06/664,975                   06/17/86
4,595,855                   06/684,881                   06/17/86
4,595,856                   06/766,236                   06/17/86
4,595,859                   06/592,938                   06/17/86
4,595,861                   06/635,770                   06/17/86
4,595,865                   06/793,368                   06/17/86
4,595,881                   06/738,865                   06/17/86
4,595,883                   06/647,789                   06/17/86
4,595,885                   06/655,823                   06/17/86
4,595,888                   06/602,650                   06/17/86
4,595,900                   06/668,942                   06/17/86
4,595,908                   06/386,394                   06/17/86
4,595,910                   06/518,146                   06/17/86
4,595,929                   06/367,853                   06/17/86
4,595,932                   06/486,120                   06/17/86
4,595,934                   06/617,942                   06/17/86
4,595,947                   06/544,893                   06/17/86
4,595,957                   06/610,442                   06/17/86
4,595,961                   06/563,740                   06/17/86
4,595,964                   06/461,057                   06/17/86
4,595,978                   06/797,171                   06/17/86
4,595,979                   06/482,578                   06/17/86
4,595,994                   06/573,528                   06/17/86
4,596,002                   06/624,488                   06/17/86
4,596,004                   06/532,113                   06/17/86
4,596,008                   06/526,433                   06/17/86
4,596,009                   06/741,364                   06/17/86
4,596,013                   06/460,557                   06/17/86
4,596,015                   06/750,660                   06/17/86
4,596,020                   06/541,354                   06/17/86
4,596,025                   06/518,566                   06/17/86
4,596,030                   06/648,298                   06/17/86
4,596,045                   06/610,611                   06/17/86
4,596,051                   06/527,054                   06/17/86
4,932,077                   07/349,485                   06/12/90
4,932,087                   07/369,339                   06/12/90
4,932,104                   07/413,531                   06/12/90
4,932,117                   07/164,840                   06/12/90
4,932,120                   07/419,825                   06/12/90
4,932,125                   07/459,443                   06/12/90
4,932,127                   07/223,460                   06/12/90
4,932,129                   07/279,649                   06/12/90
4,932,136                   07/379,624                   06/12/90
4,932,137                   07/368,194                   06/12/90
4,932,146                   07/208,745                   06/12/90
4,932,148                   07/299,665                   06/12/90
4,932,153                   07/408,253                   06/12/90
4,932,165                   07/239,826                   06/12/90
4,932,170                   07/373,408                   06/12/90
4,932,175                   07/281,077                   06/12/90
4,932,177                   07/302,807                   06/12/90
4,932,181                   07/380,702                   06/12/90
4,932,187                   07/312,267                   06/12/90
4,932,190                   07/254,173                   06/12/90
4,932,191                   07/374,886                   06/12/90
4,932,192                   07/367,942                   06/12/90
4,932,193                   07/413,397                   06/12/90
4,932,194                   06/299,020                   06/12/90
4,932,195                   07/350,755                   06/12/90
4,932,197                   07/291,277                   06/12/90
4,932,202                   07/377,464                   06/12/90
4,932,204                   07/332,195                   06/12/90
4,932,210                   07/234,407                   06/12/90
4,932,211                   07/241,024                   06/12/90
4,932,213                   07/309,584                   06/12/90
4,932,215                   07/359,409                   06/12/90
4,932,222                   07/259,296                   06/12/90
4,932,224                   07/346,645                   06/12/90
4,932,227                   07/247,196                   06/12/90
4,932,228                   07/148,731                   06/12/90
4,932,237                   07/222,654                   06/12/90
4,932,239                   07/241,813                   06/12/90
4,932,240                   07/377,891                   06/12/90
4,932,247                   07/223,365                   06/12/90
4,932,250                   07/220,014                   06/12/90
4,932,251                   07/288,217                   06/12/90
4,932,262                   07/371,155                   06/12/90
4,932,263                   07/371,141                   06/12/90
4,932,265                   07/352,684                   06/12/90
4,932,266                   07/271,752                   06/12/90
4,932,270                   07/326,820                   06/12/90
4,932,272                   07/232,803                   06/12/90
4,932,273                   07/278,401                   06/12/90
4,932,282                   07/215,161                   06/12/90
4,932,284                   07/380,030                   06/12/90
4,932,287                   07/268,316                   06/12/90
4,932,291                   07/404,860                   06/12/90
4,932,294                   07/381,534                   06/12/90
4,932,300                   07/316,757                   06/12/90
4,932,311                   07/229,062                   06/12/90
4,932,317                   07/369,512                   06/12/90
4,932,323                   07/303,572                   06/12/90
4,932,325                   07/382,731                   06/12/90
4,932,328                   07/369,303                   06/12/90
4,932,329                   07/392,416                   06/12/90
4,932,330                   06/904,724                   06/12/90
4,932,332                   07/396,627                   06/12/90
4,932,336                   07/413,530                   06/12/90
4,932,341                   07/348,943                   06/12/90
4,932,344                   07/194,940                   06/12/90
4,932,345                   07/286,384                   06/12/90
4,932,347                   07/230,138                   06/12/90
4,932,350                   07/250,255                   06/12/90
4,932,353                   07/279,721                   06/12/90
4,932,363                   07/279,157                   06/12/90
4,932,370                   07/407,338                   06/12/90
4,932,376                   07/301,022                   06/12/90
4,932,378                   07/111,880                   06/12/90
4,932,380                   07/264,483                   06/12/90
4,932,392                   07/417,916                   06/12/90
4,932,393                   07/312,806                   06/12/90
4,932,398                   07/290,484                   06/12/90
4,932,399                   07/254,186                   06/12/90
4,932,403                   07/337,901                   06/12/90
4,932,405                   07/082,548                   06/12/90
4,932,417                   07/219,253                   06/12/90
4,932,418                   07/268,009                   06/12/90
4,932,422                   07/364,841                   06/12/90
4,932,425                   07/230,900                   06/12/90
4,932,436                   07/410,082                   06/12/90
4,932,437                   07/309,257                   06/12/90
4,932,442                   07/340,745                   06/12/90
4,932,443                   07/341,366                   06/12/90
4,932,445                   07/211,710                   06/12/90
4,932,449                   07/406,391                   06/12/90
4,932,453                   07/224,403                   06/12/90
4,932,456                   07/374,757                   06/12/90
4,932,458                   07/301,153                   06/12/90
4,932,463                   07/257,916                   06/12/90
4,932,464                   07/417,933                   06/12/90
4,932,469                   07/417,049                   06/12/90
4,932,470                   07/325,980                   06/12/90
4,932,472                   07/343,959                   06/12/90
4,932,477                   07/382,309                   06/12/90
4,932,482                   07/380,426                   06/12/90
4,932,487                   07/395,983                   06/12/90
4,932,489                   07/178,624                   06/12/90
4,932,491                   07/326,815                   06/12/90
4,932,492                   07/269,442                   06/12/90
4,932,494                   07/275,051                   06/12/90
4,932,502                   07/310,553                   06/12/90
4,932,504                   07/386,295                   06/12/90
4,932,510                   07/058,209                   06/12/90
4,932,512                   07/420,435                   06/12/90
4,932,513                   07/253,406                   06/12/90
4,932,514                   07/229,777                   06/12/90
4,932,516                   07/197,106                   06/12/90
4,932,519                   07/252,408                   06/12/90
4,932,522                   07/410,307                   06/12/90
4,932,523                   07/376,309                   06/12/90
4,932,526                   07/316,493                   06/12/90
4,932,528                   07/358,588                   06/12/90
4,932,530                   07/272,472                   06/12/90
4,932,537                   06/909,646                   06/12/90
4,932,538                   07/215,598                   06/12/90
4,932,548                   07/408,895                   06/12/90
4,932,552                   07/238,717                   06/12/90
4,932,553                   07/176,029                   06/12/90
4,932,557                   07/409,895                   06/12/90
4,932,559                   07/261,378                   06/12/90
4,932,563                   07/234,509                   06/12/90
4,932,565                   07/314,725                   06/12/90
4,932,570                   07/326,031                   06/12/90
4,932,572                   07/339,262                   06/12/90
4,932,581                   07/347,945                   06/12/90
4,932,585                   07/376,295                   06/12/90
4,932,587                   07/398,914                   06/12/90
4,932,593                   07/224,761                   06/12/90
4,932,594                   07/197,926                   06/12/90
4,932,595                   07/313,509                   06/12/90
4,932,597                   07/280,381                   06/12/90
4,932,601                   07/319,932                   06/12/90
4,932,610                   06/838,649                   06/12/90
4,932,611                   07/317,663                   06/12/90
4,932,637                   07/301,025                   06/12/90
4,932,642                   07/401,986                   06/12/90
4,932,644                   07/349,990                   06/12/90
4,932,651                   07/416,693                   06/12/90
4,932,652                   07/243,639                   06/12/90
4,932,657                   07/243,710                   06/12/90
4,932,658                   07/345,223                   06/12/90
4,932,659                   07/177,134                   06/12/90
4,932,669                   07/332,334                   06/12/90
4,932,682                   07/260,065                   06/12/90
4,932,691                   07/305,788                   06/12/90
4,932,692                   07/325,936                   06/12/90
4,932,695                   07/448,257                   06/12/90
4,932,696                   07/314,708                   06/12/90
4,932,697                   07/291,781                   06/12/90
4,932,699                   07/393,384                   06/12/90
4,932,711                   07/365,756                   06/12/90
4,932,713                   07/297,429                   06/12/90
4,932,714                   07/245,581                   06/12/90
4,932,719                   07/406,668                   06/12/90
4,932,720                   07/270,671                   06/12/90
4,932,738                   07/366,047                   06/12/90
4,932,746                   07/197,206                   06/12/90
4,932,747                   07/404,243                   06/12/90
4,932,748                   07/377,983                   06/12/90
4,932,754                   07/318,506                   06/12/90
4,932,762                   07/282,665                   06/12/90
4,932,765                   07/111,931                   06/12/90
4,932,766                   07/344,769                   06/12/90
4,932,767                   07/384,940                   06/12/90
4,932,770                   07/286,946                   06/12/90
4,932,778                   07/387,906                   06/12/90
4,932,779                   07/293,621                   06/12/90
4,932,780                   07/116,233                   06/12/90
4,932,782                   07/224,976                   06/12/90
4,932,796                   07/351,961                   06/12/90
4,932,799                   07/227,534                   06/12/90
4,932,801                   07/329,614                   06/12/90
4,932,808                   07/257,329                   06/12/90
4,932,810                   07/411,763                   06/12/90
4,932,813                   07/214,405                   06/12/90
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