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 January 14, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,020                  07/138,536                   08/15/89
(4,564,218)                (06/601,003)                (01/14/86)
Re. 33,672                  07/044,066                   08/27/91
(4,564,019)                (06/480,589)                (01/14/86)
4,563,786                   06/583,602                   01/14/86
4,563,793                   06/663,873                   01/14/86
4,563,795                   06/662,612                   01/14/86
4,563,799                   06/539,929                   01/14/86
4,563,807                   06/596,592                   01/14/86
4,563,810                   06/704,837                   01/14/86
4,563,814                   06/569,961                   01/14/86
4,563,829                   06/619,572                   01/14/86
4,563,830                   06/492,627                   01/14/86
4,563,832                   06/486,578                   01/14/86
4,563,837                   06/478,324                   01/14/86
4,563,846                   06/472,946                   01/14/86
4,563,860                   06/558,859                   01/14/86
4,563,868                   06/668,073                   01/14/86
4,563,869                   06/378,908                   01/14/86
4,563,876                   06/704,660                   01/14/86
4,563,879                   06/736,357                   01/14/86
4,563,883                   06/651,381                   01/14/86
4,563,891                   06/549,884                   01/14/86
4,563,894                   06/642,972                   01/14/86
4,563,896                   06/549,900                   01/14/86
4,563,900                   06/603,937                   01/14/86
4,563,904                   06/649,656                   01/14/86
4,563,905                   06/644,877                   01/14/86
4,563,910                   06/584,596                   01/14/86
4,563,913                   06/626,441                   01/14/86
4,563,917                   06/655,723                   01/14/86
4,563,922                   06/582,187                   01/14/86
4,563,937                   06/455,506                   01/14/86
4,563,942                   06/436,704                   01/14/86
4,563,954                   06/540,178                   01/14/86
4,563,959                   06/673,706                   01/14/86
4,563,962                   06/381,754                   01/14/86
4,563,983                   06/697,924                   01/14/86
4,563,988                   06/528,635                   01/14/86
4,563,990                   06/554,883                   01/14/86
4,563,991                   06/666,465                   01/14/86
4,564,001                   06/621,788                   01/14/86
4,564,003                   06/633,067                   01/14/86
4,564,005                   06/558,039                   01/14/86
4,564,007                   06/543,969                   01/14/86
4,564,009                   06/525,988                   01/14/86
4,564,010                   06/601,708                   01/14/86
4,564,017                   06/673,688                   01/14/86
4,564,024                   06/628,201                   01/14/86
4,564,025                   06/586,091                   01/14/86
4,564,030                   06/398,962                   01/14/86
4,564,035                   06/652,672                   01/14/86
4,564,037                   06/526,420                   01/14/86
4,564,043                   06/627,432                   01/14/86
4,564,044                   06/588,861                   01/14/86
4,564,051                   06/631,936                   01/14/86
4,564,059                   06/565,140                   01/14/86
4,564,071                   06/666,992                   01/14/86
4,564,076                   06/483,478                   01/14/86
4,564,086                   06/546,300                   01/14/86
4,564,089                   06/557,559                   01/14/86
4,564,093                   06/510,197                   01/14/86
4,564,104                   06/518,890                   01/14/86
4,564,105                   06/566,824                   01/14/86
4,564,107                   06/578,523                   01/14/86
4,564,111                   06/566,657                   01/14/86
4,564,133                   06/651,664                   01/14/86
4,564,137                   06/517,703                   01/14/86
4,564,139                   06/481,634                   01/14/86
4,564,151                   06/617,310                   01/14/86
4,564,163                   06/616,525                   01/14/86
4,564,183                   06/699,032                   01/14/86
4,564,185                   06/684,814                   01/14/86
4,564,188                   06/671,009                   01/14/86
4,564,198                   06/439,136                   01/14/86
4,564,214                   06/589,946                   01/14/86
4,564,215                   06/636,145                   01/14/86
4,564,217                   06/555,020                   01/14/86
4,564,227                   06/574,044                   01/14/86
4,564,228                   06/535,368                   01/14/86
4,564,244                   06/562,197                   01/14/86
4,564,249                   06/568,892                   01/14/86
4,564,255                   06/602,930                   01/14/86
4,564,285                   06/498,988                   01/14/86
4,564,286                   06/502,783                   01/14/86
4,564,288                   06/691,277                   01/14/86
4,564,290                   06/430,886                   01/14/86
4,564,294                   06/584,825                   01/14/86
4,564,296                   06/305,374                   01/14/86
4,564,300                   06/390,066                   01/14/86
4,564,302                   06/551,910                   01/14/86
4,564,304                   06/593,235                   01/14/86
4,564,311                   06/460,447                   01/14/86
4,564,317                   06/535,035                   01/14/86
4,564,320                   06/575,498                   01/14/86
4,564,326                   06/526,539                   01/14/86
4,564,332                   06/595,820                   01/14/86
4,564,338                   06/718,299                   01/14/86
4,564,346                   06/647,071                   01/14/86
4,564,347                   06/599,328                   01/14/86
4,564,363                   06/513,512                   01/14/86
4,564,367                   06/622,475                   01/14/86
4,564,373                   06/357,560                   01/14/86
4,564,374                   06/534,362                   01/14/86
4,564,380                   06/685,019                   01/14/86
4,564,385                   06/695,500                   01/14/86
4,564,387                   06/494,310                   01/14/86
4,564,403                   06/574,571                   01/14/86
4,564,404                   06/559,758                   01/14/86
4,564,405                   06/620,181                   01/14/86
4,564,406                   06/581,803                   01/14/86
4,564,426                   06/723,371                   01/14/86
4,564,430                   06/654,760                   01/14/86
4,564,433                   06/626,860                   01/14/86
4,564,438                   06/739,644                   01/14/86
4,564,447                   06/577,620                   01/14/86
4,564,458                   06/649,907                   01/14/86
4,564,468                   06/680,930                   01/14/86
4,564,477                   06/467,253                   01/14/86
4,564,484                   06/674,984                   01/14/86
4,564,489                   06/533,338                   01/14/86
4,564,490                   06/616,787                   01/14/86
4,564,500                   06/545,420                   01/14/86
4,564,505                   06/587,890                   01/14/86
4,564,507                   06/544,472                   01/14/86
4,564,510                   06/517,789                   01/14/86
4,564,512                   06/432,294                   01/14/86
4,564,513                   06/665,724                   01/14/86
4,564,523                   06/713,506                   01/14/86
4,564,526                   06/532,183                   01/14/86
4,564,527                   06/677,198                   01/14/86
4,564,528                   06/651,859                   01/14/86
4,564,530                   06/643,683                   01/14/86
4,564,531                   06/755,537                   01/14/86
4,564,533                   06/693,296                   01/14/86
4,564,550                   06/704,390                   01/14/86
4,564,553                   06/604,134                   01/14/86
4,564,563                   06/537,740                   01/14/86
4,564,567                   06/550,697                   01/14/86
4,564,571                   06/581,829                   01/14/86
4,564,575                   06/560,781                   01/14/86
4,564,577                   06/733,151                   01/14/86
4,564,579                   06/680,739                   01/14/86
4,564,582                   06/550,380                   01/14/86
4,564,604                   06/671,698                   01/14/86
4,564,605                   06/673,889                   01/14/86
4,564,609                   06/592,866                   01/14/86
4,564,612                   06/599,187                   01/14/86
4,564,614                   06/695,518                   01/14/86
4,564,618                   06/532,859                   01/14/86
4,564,630                   06/565,922                   01/14/86
4,564,632                   06/324,912                   01/14/86
4,564,634                   06/496,111                   01/14/86
4,564,638                   06/503,212                   01/14/86
4,564,643                   06/731,750                   01/14/86
4,564,645                   06/689,357                   01/14/86
4,564,651                   06/624,972                   01/14/86
4,564,653                   06/645,358                   01/14/86
4,564,659                   06/525,473                   01/14/86
4,564,661                   06/711,055                   01/14/86
4,564,662                   06/582,926                   01/14/86
4,564,667                   06/704,405                   01/14/86
4,564,671                   06/681,546                   01/14/86
4,564,673                   06/554,112                   01/14/86
4,564,674                   06/662,833                   01/14/86
4,564,676                   06/477,836                   01/14/86
4,564,679                   06/388,935                   01/14/86
4,564,680                   06/519,792                   01/14/86
4,564,681                   06/422,751                   01/14/86
4,564,683                   06/598,620                   01/14/86
4,564,688                   06/594,328                   01/14/86
4,564,692                   06/514,731                   01/14/86
4,564,696                   06/423,569                   01/14/86
4,564,699                   06/379,842                   01/14/86
4,564,702                   06/489,407                   01/14/86
4,564,707                   06/245,469                   01/14/86
4,564,709                   06/545,392                   01/14/86
4,564,746                   06/629,587                   01/14/86
4,564,753                   06/505,538                   01/14/86
4,564,761                   06/469,159                   01/14/86
4,564,767                   06/548,944                   01/14/86
4,564,778                   06/590,285                   01/14/86
4,564,779                   06/650,392                   01/14/86
4,564,783                   06/501,422                   01/14/86
4,564,794                   06/737,003                   01/14/86
4,564,799                   06/495,585                   01/14/86
4,564,804                   06/271,496                   01/14/86
4,564,812                   06/530,807                   01/14/86
4,564,816                   06/608,415                   01/14/86
4,564,818                   06/644,087                   01/14/86
4,564,819                   06/673,340                   01/14/86
4,564,821                   06/655,796                   01/14/86
4,564,830                   06/633,627                   01/14/86
4,564,833                   06/377,206                   01/14/86
4,564,834                   06/540,654                   01/14/86
4,564,835                   06/449,238                   01/14/86
4,564,846                   06/665,030                   01/14/86
4,564,848                   06/594,677                   01/14/86
4,564,850                   06/550,028                   01/14/86
4,564,852                   06/767,053                   01/14/86
4,564,867                   06/286,222                   01/14/86
4,564,873                   06/429,989                   01/14/86
4,564,880                   06/589,904                   01/14/86
4,564,883                   06/439,021                   01/14/86
4,564,884                   06/503,799                   01/14/86
4,564,890                   06/679,551                   01/14/86
4,564,892                   06/638,457                   01/14/86
4,564,913                   06/580,809                   01/14/86
4,564,925                   06/535,056                   01/14/86
4,564,928                   06/430,253                   01/14/86
4,564,937                   06/564,136                   01/14/86
4,564,942                   06/476,267                   01/14/86
4,564,948                   06/593,609                   01/14/86
4,564,951                   06/633,987                   01/14/86
4,564,953                   06/479,373                   01/14/86
4,891,845                   07/158,647                   01/09/90
4,891,852                   07/312,453                   01/09/90
4,891,855                   07/270,786                   01/09/90
4,891,857                   07/216,375                   01/09/90
4,891,858                   07/166,411                   01/09/90
4,891,860                   07/268,490                   01/09/90
4,891,866                   07/230,436                   01/09/90
4,891,867                   06/435,927                   01/09/90
4,891,868                   07/336,118                   01/09/90
4,891,871                   07/216,491                   01/09/90
4,891,877                   07/325,861                   01/09/90
4,891,880                   07/184,314                   01/09/90
4,891,881                   07/352,401                   01/09/90
4,891,882                   07/093,353                   01/09/90
4,891,884                   07/076,080                   01/09/90
4,891,885                   07/109,518                   01/09/90
4,891,886                   07/075,613                   01/09/90
4,891,889                   07/189,227                   01/09/90
4,891,896                   07/232,238                   01/09/90
4,891,902                   07/116,812                   01/09/90
4,891,909                   07/331,170                   01/09/90
4,891,912                   07/297,340                   01/09/90
4,891,917                   07/264,274                   01/09/90
4,891,918                   07/121,234                   01/09/90
4,891,921                   07/031,536                   01/09/90
4,891,923                   07/205,329                   01/09/90
4,891,926                   07/295,983                   01/09/90
4,891,927                   07/275,678                   01/09/90
4,891,935                   07/357,698                   01/09/90
4,891,938                   06/840,619                   01/09/90
4,891,948                   06/814,279                   01/09/90
4,891,956                   07/286,308                   01/09/90
4,891,962                   07/302,374                   01/09/90
4,891,963                   07/239,213                   01/09/90
4,891,969                   07/216,073                   01/09/90
4,891,973                   07/221,464                   01/09/90
4,891,974                   07/249,349                   01/09/90
4,891,977                   07/285,272                   01/09/90
4,891,982                   07/205,194                   01/09/90
4,891,992                   07/301,121                   01/09/90
4,891,993                   07/252,456                   01/09/90
4,892,006                   07/130,720                   01/09/90
4,892,012                   07/303,081                   01/09/90
4,892,015                   07/252,376                   01/09/90
4,892,017                   07/334,478                   01/09/90
4,892,024                   07/228,230                   01/09/90
4,892,032                   07/276,933                   01/09/90
4,892,039                   07/321,688                   01/09/90
4,892,041                   07/116,254                   01/09/90
4,892,049                   07/346,067                   01/09/90
4,892,054                   07/266,858                   01/09/90
4,892,055                   07/228,496                   01/09/90
4,892,058                   07/166,231                   01/09/90
4,892,063                   06/742,643                   01/09/90
4,892,065                   07/357,895                   01/09/90
4,892,069                   07/225,455                   01/09/90
4,892,071                   07/222,972                   01/09/90
4,892,085                   07/113,124                   01/09/90
4,892,086                   07/293,751                   01/09/90
4,892,090                   07/221,799                   01/09/90
4,892,092                   07/078,633                   01/09/90
4,892,099                   07/284,763                   01/09/90
4,892,102                   06/912,236                   01/09/90
4,892,106                   07/109,403                   01/09/90
4,892,107                   07/141,019                   01/09/90
4,892,108                   07/076,882                   01/09/90
4,892,111                   07/065,280                   01/09/90
4,892,112                   07/229,056                   01/09/90
4,892,120                   07/254,820                   01/09/90
4,892,124                   07/280,710                   01/09/90
4,892,128                   07/286,041                   01/09/90
4,892,129                   07/116,568                   01/09/90
4,892,137                   07/286,823                   01/09/90
4,892,140                   07/273,844                   01/09/90
4,892,147                   07/138,174                   01/09/90
4,892,181                   07/168,150                   01/09/90
4,892,187                   07/313,030                   01/09/90
4,892,193                   07/323,191                   01/09/90
4,892,194                   07/310,365                   01/09/90
4,892,197                   07/324,089                   01/09/90
4,892,200                   07/358,148                   01/09/90
4,892,205                   07/219,731                   01/09/90
4,892,207                   07/173,925                   01/09/90
4,892,210                   07/258,625                   01/09/90
4,892,220                   07/373,511                   01/09/90
4,892,224                   07/190,998                   01/09/90
4,892,228                   07/226,082                   01/09/90
4,892,229                   07/236,183                   01/09/90
4,892,242                   07/143,478                   01/09/90
4,892,248                   07/196,466                   01/09/90
4,892,249                   07/170,527                   01/09/90
4,892,251                   07/270,662                   01/09/90
4,892,255                   07/258,186                   01/09/90
4,892,270                   07/203,994                   01/09/90
4,892,275                   07/265,028                   01/09/90
4,892,278                   07/307,878                   01/09/90
4,892,279                   07/045,329                   01/09/90
4,892,280                   07/250,714                   01/09/90
4,892,287                   07/245,800                   01/09/90
4,892,292                   06/862,252                   01/09/90
4,892,295                   07/280,913                   01/09/90
4,892,296                   07/316,044                   01/09/90
4,892,297                   07/194,464                   01/09/90
4,892,314                   07/298,125                   01/09/90
4,892,323                   07/263,417                   01/09/90
4,892,326                   07/116,729                   01/09/90
4,892,330                   07/285,693                   01/09/90
4,892,334                   07/321,002                   01/09/90
4,892,336                   07/027,552                   01/09/90
4,892,342                   07/296,636                   01/09/90
4,892,349                   07/193,905                   01/09/90
4,892,350                   07/227,249                   01/09/90
4,892,356                   07/224,936                   01/09/90
4,892,362                   07/230,617                   01/09/90
4,892,366                   07/352,648                   01/09/90
4,892,373                   06/560,016                   01/09/90
4,892,381                   07/292,063                   01/09/90
4,892,383                   07/312,645                   01/09/90
4,892,385                   06/235,970                   01/09/90
4,892,401                   07/321,873                   01/09/90
4,892,409                   07/218,874                   01/09/90
4,892,417                   07/292,132                   01/09/90
4,892,420                   07/172,591                   01/09/90
4,892,424                   07/250,657                   01/09/90
4,892,428                   07/112,997                   01/09/90
4,892,432                   07/142,600                   01/09/90
4,892,434                   07/264,835                   01/09/90
4,892,440                   07/215,545                   01/09/90
4,892,441                   07/328,248                   01/09/90
4,892,450                   07/170,928                   01/09/90
4,892,452                   07/124,828                   01/09/90
4,892,454                   07/226,939                   01/09/90
4,892,457                   07/217,304                   01/09/90
4,892,467                   07/282,528                   01/09/90
4,892,469                   06/250,730                   01/09/90
4,892,476                   07/111,056                   01/09/90
4,892,478                   07/171,493                   01/09/90
4,892,484                   07/319,303                   01/09/90
4,892,486                   07/279,002                   01/09/90
4,892,487                   07/366,848                   01/09/90
4,892,488                   07/117,050                   01/09/90
4,892,494                   07/177,530                   01/09/90
4,892,497                   07/270,674                   01/09/90
4,892,500                   07/162,663                   01/09/90
4,892,504                   07/174,786                   01/09/90
4,892,505                   07/313,225                   01/09/90
4,892,512                   07/084,310                   01/09/90
4,892,515                   07/219,034                   01/09/90
4,892,516                   06/598,546                   01/09/90
4,892,518                   07/128,890                   01/09/90
4,892,520                   07/226,796                   01/09/90
4,892,521                   07/227,756                   01/09/90
4,892,524                   07/115,424                   01/09/90
4,892,526                   07/234,029                   01/09/90
4,892,527                   07/095,174                   01/09/90
4,892,531                   07/095,212                   01/09/90
4,892,537                   06/700,793                   01/09/90
4,892,543                   07/305,603                   01/09/90
4,892,544                   07/164,700                   01/09/90
4,892,545                   07/219,087                   01/09/90
4,892,551                   06/881,638                   01/09/90
4,892,553                   07/205,462                   01/09/90
4,892,559                   06/900,026                   01/09/90
4,892,565                   07/285,468                   01/09/90
4,892,570                   07/245,811                   01/09/90
4,892,571                   07/233,360                   01/09/90
4,892,583                   07/268,205                   01/09/90
4,892,594                   07/253,890                   01/09/90
4,892,597                   07/401,194                   01/09/90
4,892,599                   07/250,909                   01/09/90
4,892,601                   07/229,505                   01/09/90
4,892,608                   07/299,589                   01/09/90
4,892,609                   07/133,180                   01/09/90
4,892,611                   07/221,023                   01/09/90
4,892,612                   07/255,801                   01/09/90
4,892,618                   07/147,049                   01/09/90
4,892,621                   07/249,358                   01/09/90
4,892,622                   07/087,400                   01/09/90
4,892,629                   07/389,219                   01/09/90
4,892,630                   07/343,145                   01/09/90
4,892,634                   07/252,322                   01/09/90
4,892,640                   07/218,445                   01/09/90
4,892,645                   07/211,205                   01/09/90
4,892,647                   07/215,779                   01/09/90
4,892,649                   07/206,247                   01/09/90
4,892,652                   07/223,208                   01/09/90
4,892,653                   07/094,670                   01/09/90
4,892,654                   07/324,353                   01/09/90
4,892,656                   07/314,613                   01/09/90
4,892,662                   07/266,831                   01/09/90
4,892,664                   07/078,779                   01/09/90
4,892,670                   06/695,958                   01/09/90
4,892,672                   06/761,534                   01/09/90
4,892,674                   07/106,805                   01/09/90
4,892,680                   07/294,374                   01/09/90
4,892,687                   06/916,770                   01/09/90
4,892,690                   07/208,918                   01/09/90
4,892,693                   07/077,451                   01/09/90
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