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 December 17, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,773                  06/854,430                   10/25/88
(4,559,598)                (06/468,493)                (12/17/85)
Re. 34,007                  07/603,172                   07/28/92
(4,885,951)                (07/123,963)                (12/12/89)
Re. 34,404                  07/524,513                   10/12/93
(4,886,139)                (07/234,353)                (12/12/89)
4,558,466                   06/520,506                   12/17/85
4,558,468                   06/658,328                   12/17/85
4,558,470                   06/436,654                   12/17/85
4,558,472                   06/664,406                   12/17/85
4,558,473                   06/557,165                   12/17/85
4,558,478                   06/597,450                   12/17/85
4,558,480                   06/627,769                   12/17/85
4,558,486                   06/552,745                   12/17/85
4,558,488                   06/515,138                   12/17/85
4,558,489                   06/553,383                   12/17/85
4,558,494                   06/621,319                   12/17/85
4,558,503                   06/622,257                   12/17/85
4,558,504                   06/447,657                   12/17/85
4,558,514                   06/600,157                   12/17/85
4,558,518                   06/454,641                   12/17/85
4,558,524                   06/433,662                   12/17/85
4,558,542                   06/219,489                   12/17/85
4,558,544                   06/676,449                   12/17/85
4,558,546                   06/459,599                   12/17/85
4,558,547                   06/602,464                   12/17/85
4,558,555                   06/574,325                   12/17/85
4,558,564                   06/543,047                   12/17/85
4,558,570                   06/512,420                   12/17/85
4,558,576                   06/550,800                   12/17/85
4,558,583                   06/577,680                   12/17/85
4,558,587                   06/645,473                   12/17/85
4,558,590                   06/604,752                   12/17/85
4,558,593                   06/634,560                   12/17/85
4,558,609                   06/456,261                   12/17/85
4,558,613                   06/624,241                   12/17/85
4,558,618                   06/623,776                   12/17/85
4,558,636                   06/605,419                   12/17/85
4,558,639                   06/620,708                   12/17/85
4,558,641                   06/559,186                   12/17/85
4,558,644                   06/687,268                   12/17/85
4,558,651                   06/543,639                   12/17/85
4,558,669                   06/582,870                   12/17/85
4,558,671                   06/513,465                   12/17/85
4,558,675                   06/638,802                   12/17/85
4,558,678                   06/465,342                   12/17/85
4,558,683                   06/746,463                   12/17/85
4,558,694                   06/544,284                   12/17/85
4,558,698                   06/585,237                   12/17/85
4,558,710                   06/611,372                   12/17/85
4,558,714                   06/493,827                   12/17/85
4,558,717                   06/582,216                   12/17/85
4,558,722                   06/591,412                   12/17/85
4,558,723                   06/560,376                   12/17/85
4,558,724                   06/651,640                   12/17/85
4,558,725                   06/595,620                   12/17/85
4,558,735                   06/539,360                   12/17/85
4,558,740                   06/734,741                   12/17/85
4,558,757                   06/615,534                   12/17/85
4,558,783                   06/633,738                   12/17/85
4,558,786                   06/504,556                   12/17/85
4,558,789                   06/502,582                   12/17/85
4,558,794                   06/542,191                   12/17/85
4,558,800                   06/630,494                   12/17/85
4,558,803                   06/613,641                   12/17/85
4,558,811                   06/588,094                   12/17/85
4,558,826                   06/639,525                   12/17/85
4,558,831                   06/517,823                   12/17/85
4,558,838                   06/666,343                   12/17/85
4,558,850                   06/650,102                   12/17/85
4,558,853                   06/567,859                   12/17/85
4,558,855                   06/546,657                   12/17/85
4,558,866                   06/293,321                   12/17/85
4,558,886                   06/534,736                   12/17/85
4,558,894                   06/662,180                   12/17/85
4,558,899                   06/593,512                   12/17/85
4,558,911                   06/564,470                   12/17/85
4,558,912                   06/561,392                   12/17/85
4,558,922                   06/608,474                   12/17/85
4,558,946                   06/460,913                   12/17/85
4,558,953                   06/444,156                   12/17/85
4,558,959                   06/664,669                   12/17/85
4,558,964                   06/548,424                   12/17/85
4,558,966                   06/530,819                   12/17/85
4,558,981                   06/626,746                   12/17/85
4,558,983                   06/544,734                   12/17/85
4,558,986                   06/608,075                   12/17/85
4,558,992                   06/728,166                   12/17/85
4,558,994                   06/627,328                   12/17/85
4,559,006                   06/623,845                   12/17/85
4,559,007                   06/318,066                   12/17/85
4,559,014                   06/496,509                   12/17/85
4,559,017                   06/531,462                   12/17/85
4,559,019                   06/512,874                   12/17/85
4,559,020                   06/494,318                   12/17/85
4,559,025                   06/596,421                   12/17/85
4,559,030                   06/552,242                   12/17/85
4,559,031                   06/725,530                   12/17/85
4,559,044                   06/404,811                   12/17/85
4,559,045                   06/493,182                   12/17/85
4,559,051                   06/515,012                   12/17/85
4,559,056                   06/630,468                   12/17/85
4,559,061                   06/662,661                   12/17/85
4,559,078                   06/562,659                   12/17/85
4,559,088                   06/610,535                   12/17/85
4,559,094                   06/655,917                   12/17/85
4,559,096                   06/623,874                   12/17/85
4,559,108                   06/416,001                   12/17/85
4,559,109                   06/480,999                   12/17/85
4,559,110                   06/512,508                   12/17/85
4,559,111                   06/684,208                   12/17/85
4,559,113                   06/590,226                   12/17/85
4,559,117                   06/441,202                   12/17/85
4,559,118                   06/648,936                   12/17/85
4,559,123                   06/669,829                   12/17/85
4,559,127                   06/613,880                   12/17/85
4,559,131                   06/631,682                   12/17/85
4,559,133                   06/532,810                   12/17/85
4,559,137                   06/591,559                   12/17/85
4,559,150                   06/519,931                   12/17/85
4,559,154                   06/636,272                   12/17/85
4,559,162                   06/353,309                   12/17/85
4,559,171                   06/459,511                   12/17/85
4,559,173                   06/548,742                   12/17/85
4,559,181                   06/563,933                   12/17/85
4,559,185                   06/675,444                   12/17/85
4,559,194                   06/620,056                   12/17/85
4,559,195                   06/461,604                   12/17/85
4,559,200                   06/638,566                   12/17/85
4,559,201                   06/572,890                   12/17/85
4,559,202                   06/660,139                   12/17/85
4,559,203                   06/526,808                   12/17/85
4,559,204                   06/641,627                   12/17/85
4,559,205                   06/470,159                   12/17/85
4,559,219                   06/595,861                   12/17/85
4,559,227                   06/666,849                   12/17/85
4,559,231                   06/496,301                   12/17/85
4,559,234                   06/615,117                   12/17/85
4,559,238                   06/399,739                   12/17/85
4,559,239                   06/562,161                   12/17/85
4,559,241                   06/668,237                   12/17/85
4,559,246                   06/703,532                   12/17/85
4,559,247                   06/534,070                   12/17/85
4,559,251                   06/701,374                   12/17/85
4,559,254                   06/374,674                   12/17/85
4,559,255                   06/685,113                   12/17/85
4,559,264                   06/461,566                   12/17/85
4,559,265                   06/567,953                   12/17/85
4,559,270                   06/518,194                   12/17/85
4,559,280                   06/682,965                   12/17/85
4,559,284                   06/659,682                   12/17/85
4,559,285                   06/625,971                   12/17/85
4,559,286                   06/650,380                   12/17/85
4,559,287                   06/670,837                   12/17/85
4,559,293                   06/595,377                   12/17/85
4,559,300                   06/458,803                   12/17/85
4,559,301                   06/471,628                   12/17/85
4,559,312                   06/533,596                   12/17/85
4,559,315                   06/631,687                   12/17/85
4,559,319                   06/711,863                   12/17/85
4,559,323                   06/637,096                   12/17/85
4,559,326                   06/696,686                   12/17/85
4,559,327                   06/484,592                   12/17/85
4,559,328                   06/623,271                   12/17/85
4,559,333                   06/585,314                   12/17/85
4,559,336                   06/705,279                   12/17/85
4,559,337                   06/705,280                   12/17/85
4,559,340                   06/555,311                   12/17/85
4,559,341                   06/576,595                   12/17/85
4,559,359                   06/615,024                   12/17/85
4,559,361                   06/538,805                   12/17/85
4,559,363                   06/641,829                   12/17/85
4,559,364                   06/655,991                   12/17/85
4,559,365                   06/626,068                   12/17/85
4,559,367                   06/722,485                   12/17/85
4,559,369                   06/665,223                   12/17/85
4,559,370                   06/614,041                   12/17/85
4,559,372                   06/663,483                   12/17/85
4,559,375                   06/691,604                   12/17/85
4,559,376                   06/525,041                   12/17/85
4,559,382                   06/501,270                   12/17/85
4,559,387                   06/658,106                   12/17/85
4,559,388                   06/683,660                   12/17/85
4,559,394                   06/635,080                   12/17/85
4,559,395                   06/704,691                   12/17/85
4,559,397                   06/701,709                   12/17/85
4,559,398                   06/636,236                   12/17/85
4,559,400                   06/677,135                   12/17/85
4,559,405                   06/600,248                   12/17/85
4,559,407                   06/540,253                   12/17/85
4,559,413                   06/598,330                   12/17/85
4,559,423                   06/604,504                   12/17/85
4,559,428                   06/537,167                   12/17/85
4,559,429                   06/676,342                   12/17/85
4,559,434                   06/449,666                   12/17/85
4,559,447                   06/495,014                   12/17/85
4,559,453                   06/491,707                   12/17/85
4,559,459                   06/480,524                   12/17/85
4,559,461                   06/631,641                   12/17/85
4,559,467                   06/446,136                   12/17/85
4,559,469                   06/725,145                   12/17/85
4,559,479                   06/594,332                   12/17/85
4,559,486                   06/565,346                   12/17/85
4,559,490                   06/567,433                   12/17/85
4,559,495                   06/360,363                   12/17/85
4,559,496                   06/617,285                   12/17/85
4,559,504                   06/569,382                   12/17/85
4,559,509                   06/529,082                   12/17/85
4,559,511                   06/486,584                   12/17/85
4,559,514                   06/556,689                   12/17/85
4,559,520                   06/391,170                   12/17/85
4,559,523                   06/437,213                   12/17/85
4,559,530                   06/433,173                   12/17/85
4,559,531                   06/466,325                   12/17/85
4,559,537                   06/448,863                   12/17/85
4,559,546                   06/647,284                   12/17/85
4,559,554                   06/534,507                   12/17/85
4,559,558                   06/413,378                   12/17/85
4,559,561                   06/556,182                   12/17/85
4,559,562                   06/523,982                   12/17/85
4,559,564                   06/581,131                   12/17/85
4,559,566                   06/332,882                   12/17/85
4,559,579                   06/571,554                   12/17/85
4,559,581                   06/628,074                   12/17/85
4,559,583                   06/594,209                   12/17/85
4,559,585                   06/589,791                   12/17/85
4,559,602                   06/461,548                   12/17/85
4,559,604                   06/304,154                   12/17/85
4,559,615                   06/418,461                   12/17/85
4,559,622                   06/416,416                   12/17/85
4,559,628                   06/488,838                   12/17/85
4,559,629                   06/531,285                   12/17/85
4,559,633                   06/542,023                   12/17/85
4,559,635                   06/578,251                   12/17/85
4,559,636                   06/445,140                   12/17/85
4,885,805                   07/259,248                   12/12/89
4,885,806                   07/309,997                   12/12/89
4,885,809                   07/339,011                   12/12/89
4,885,810                   07/313,613                   12/12/89
4,885,811                   07/197,439                   12/12/89
4,885,814                   07/250,924                   12/12/89
4,885,818                   07/219,307                   12/12/89
4,885,820                   07/114,983                   12/12/89
4,885,824                   07/239,641                   12/12/89
4,885,827                   07/245,238                   12/12/89
4,885,830                   07/311,835                   12/12/89
4,885,832                   07/216,085                   12/12/89
4,885,834                   07/253,035                   12/12/89
4,885,835                   07/305,790                   12/12/89
4,885,838                   07/266,911                   12/12/89
4,885,846                   07/196,376                   12/12/89
4,885,850                   07/173,216                   12/12/89
4,885,852                   07/076,626                   12/12/89
4,885,857                   07/311,043                   12/12/89
4,885,863                   07/198,323                   12/12/89
4,885,864                   07/244,022                   12/12/89
4,885,866                   07/204,903                   12/12/89
4,885,867                   07/261,348                   12/12/89
4,885,868                   07/219,819                   12/12/89
4,885,869                   07/256,571                   12/12/89
4,885,871                   07/249,103                   12/12/89
4,885,874                   07/149,108                   12/12/89
4,885,878                   07/093,889                   12/12/89
4,885,884                   07/355,861                   12/12/89
4,885,886                   07/246,635                   12/12/89
4,885,888                   07/120,973                   12/12/89
4,885,894                   07/145,380                   12/12/89
4,885,897                   07/255,200                   12/12/89
4,885,901                   07/247,356                   12/12/89
4,885,902                   07/181,323                   12/12/89
4,885,911                   07/159,840                   12/12/89
4,885,915                   07/079,701                   12/12/89
4,885,917                   06/920,669                   12/12/89
4,885,918                   07/269,129                   12/12/89
4,885,930                   07/238,675                   12/12/89
4,885,942                   07/099,782                   12/12/89
4,885,944                   07/160,869                   12/12/89
4,885,949                   07/167,489                   12/12/89
4,885,955                   07/328,681                   12/12/89
4,885,958                   07/250,689                   12/12/89
4,885,961                   06/927,569                   12/12/89
4,885,966                   07/249,921                   12/12/89
4,885,969                   07/081,040                   12/12/89
4,885,970                   07/081,630                   12/12/89
4,885,974                   06/655,593                   12/12/89
4,885,977                   07/141,318                   12/12/89
4,885,978                   07/187,012                   12/12/89
4,885,981                   07/179,541                   12/12/89
4,885,987                   07/197,660                   12/12/89
4,885,991                   07/223,655                   12/12/89
4,885,992                   07/235,419                   12/12/89
4,885,994                   06/494,839                   12/12/89
4,885,995                   07/174,422                   12/12/89
4,886,000                   06/709,351                   12/12/89
4,886,006                   07/313,208                   12/12/89
4,886,007                   07/224,644                   12/12/89
4,886,009                   07/211,949                   12/12/89
4,886,010                   07/247,913                   12/12/89
4,886,013                   07/296,438                   12/12/89
4,886,017                   07/075,723                   12/12/89
4,886,020                   07/274,247                   12/12/89
4,886,032                   07/274,550                   12/12/89
4,886,033                   07/237,814                   12/12/89
4,886,037                   07/026,864                   12/12/89
4,886,042                   07/299,098                   12/12/89
4,886,043                   07/243,952                   12/12/89
4,886,045                   07/346,489                   12/12/89
4,886,047                   07/254,611                   12/12/89
4,886,049                   07/195,039                   12/12/89
4,886,051                   07/211,939                   12/12/89
4,886,053                   07/222,146                   12/12/89
4,886,054                   07/262,609                   12/12/89
4,886,055                   07/147,231                   12/12/89
4,886,073                   07/182,397                   12/12/89
4,886,074                   07/167,890                   12/12/89
4,886,085                   07/277,628                   12/12/89
4,886,088                   07/152,350                   12/12/89
4,886,092                   07/261,119                   12/12/89
4,886,098                   07/126,465                   12/12/89
4,886,099                   07/233,805                   12/12/89
4,886,100                   07/202,549                   12/12/89
4,886,104                   07/232,542                   12/12/89
4,886,112                   07/146,649                   12/12/89
4,886,116                   07/294,284                   12/12/89
4,886,120                   07/305,306                   12/12/89
4,886,121                   07/279,926                   12/12/89
4,886,123                   07/143,213                   12/12/89
4,886,124                   07/141,977                   12/12/89
4,886,126                   07/282,595                   12/12/89
4,886,128                   07/173,783                   12/12/89
4,886,132                   07/316,269                   12/12/89
4,886,133                   07/254,265                   12/12/89
4,886,135                   07/186,842                   12/12/89
4,886,138                   07/288,661                   12/12/89
4,886,141                   07/203,970                   12/12/89
4,886,145                   07/216,369                   12/12/89
4,886,147                   07/286,165                   12/12/89
4,886,150                   07/197,678                   12/12/89
4,886,151                   07/171,181                   12/12/89
4,886,155                   07/230,087                   12/12/89
4,886,157                   07/098,549                   12/12/89
4,886,159                   07/225,226                   12/12/89
4,886,166                   06/785,093                   12/12/89
4,886,176                   07/261,986                   12/12/89
4,886,182                   07/357,235                   12/12/89
4,886,184                   07/299,597                   12/12/89
4,886,189                   07/229,715                   12/12/89
4,886,193                   07/068,993                   12/12/89
4,886,197                   07/199,800                   12/12/89
4,886,202                   07/268,145                   12/12/89
4,886,207                   07/244,135                   12/12/89
4,886,211                   07/174,732                   12/12/89
4,886,216                   07/165,499                   12/12/89
4,886,225                   06/501,667                   12/12/89
4,886,227                   07/341,146                   12/12/89
4,886,228                   07/242,101                   12/12/89
4,886,230                   06/926,897                   12/12/89
4,886,231                   07/289,800                   12/12/89
4,886,235                   07/306,218                   12/12/89
4,886,236                   07/305,285                   12/12/89
4,886,242                   07/250,772                   12/12/89
4,886,248                   07/285,425                   12/12/89
4,886,250                   07/083,665                   12/12/89
4,886,254                   07/155,711                   12/12/89
4,886,255                   07/054,539                   12/12/89
4,886,258                   07/235,621                   12/12/89
4,886,260                   07/109,365                   12/12/89
4,886,261                   07/160,400                   12/12/89
4,886,264                   07/259,922                   12/12/89
4,886,274                   07/212,704                   12/12/89
4,886,275                   07/284,722                   12/12/89
4,886,282                   07/261,561                   12/12/89
4,886,283                   07/220,611                   12/12/89
4,886,287                   07/168,171                   12/12/89
4,886,294                   07/193,503                   12/12/89
4,886,297                   07/238,622                   12/12/89
4,886,300                   07/230,372                   12/12/89
4,886,301                   07/190,335                   12/12/89
4,886,306                   07/265,379                   12/12/89
4,886,309                   07/134,250                   12/12/89
4,886,312                   07/295,792                   12/12/89
4,886,320                   07/231,931                   12/12/89
4,886,321                   07/281,130                   12/12/89
4,886,331                   07/169,316                   12/12/89
4,886,333                   07/167,332                   12/12/89
4,886,334                   07/239,352                   12/12/89
4,886,340                   07/217,558                   12/12/89
4,886,353                   07/169,416                   12/12/89
4,886,354                   07/191,306                   12/12/89
4,886,358                   07/200,324                   12/12/89
4,886,360                   07/096,408                   12/12/89
4,886,365                   07/200,627                   12/12/89
4,886,367                   07/200,085                   12/12/89
4,886,375                   07/320,982                   12/12/89
4,886,376                   07/167,396                   12/12/89
4,886,377                   07/134,129                   12/12/89
4,886,379                   07/108,096                   12/12/89
4,886,380                   07/091,835                   12/12/89
4,886,388                   07/225,640                   12/12/89
4,886,393                   07/004,611                   12/12/89
4,886,395                   07/069,547                   12/12/89
4,886,403                   07/165,916                   12/12/89
4,886,407                   07/256,687                   12/12/89
4,886,414                   07/109,531                   12/12/89
4,886,416                   07/256,325                   12/12/89
4,886,417                   07/280,715                   12/12/89
4,886,419                   07/252,795                   12/12/89
4,886,422                   07/216,417                   12/12/89
4,886,430                   07/220,720                   12/12/89
4,886,439                   07/289,821                   12/12/89
4,886,440                   06/901,289                   12/12/89
4,886,445                   07/115,887                   12/12/89
4,886,447                   07/194,310                   12/12/89
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