Notice of Expiration of Patents
                    Due to Failure to Pay Maintenance Fees

   35 U.S.C. 41 and 37 CFR 1.362(g) provide that if the required
maintenance 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 applicable surcharge.

                    PATENTS WHICH EXPIRED February 19, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,423                  06/797,170                   05/19/87
(4,500,638)                (06/437,517)                (02/19/85)
Re. 34,131                  07/639,481                   11/24/92
(4,804,884)                (07/645,922)                (02/14/89)
Re. 34,186                  07/774,578                   03/02/93
(4,804,003)                (07/106,205)                (02/14/89)
4,499,620                   06/453,906                   02/19/85
4,499,621                   06/471,044                   02/19/85
4,499,624                   06/469,756                   02/19/85
4,499,648                   06/426,455                   02/19/85
4,499,649                   06/407,293                   02/19/85
4,499,650                   06/391,636                   02/19/85
4,499,656                   06/523,232                   02/19/85
4,499,660                   06/280,574                   02/19/85
4,499,662                   06/560,260                   02/19/85
4,499,663                   06/541,184                   02/19/85
4,499,664                   06/325,677                   02/19/85
4,499,665                   06/449,605                   02/19/85
4,499,671                   06/401,172                   02/19/85
4,499,672                   06/451,427                   02/19/85
4,499,673                   06/472,502                   02/19/85
4,499,687                   06/462,416                   02/19/85
4,499,691                   06/411,307                   02/19/85
4,499,693                   06/418,440                   02/19/85
4,499,695                   06/357,122                   02/19/85
4,499,696                   06/232,995                   02/19/85
4,499,697                   06/232,584                   02/19/85
4,499,703                   06/348,907                   02/19/85
4,499,719                   06/527,867                   02/19/85
4,499,722                   06/420,668                   02/19/85
4,499,723                   06/401,476                   02/19/85
4,499,729                   06/500,515                   02/19/85
4,499,731                   06/427,004                   02/19/85
4,499,736                   06/559,547                   02/19/85
4,499,737                   06/472,707                   02/19/85
4,499,756                   06/498,353                   02/19/85
4,499,774                   06/284,340                   02/19/85
4,499,778                   06/231,242                   02/19/85
4,499,785                   06/392,516                   02/19/85
4,499,786                   06/385,364                   02/19/85
4,499,790                   06/396,035                   02/19/85
4,499,792                   06/390,846                   02/19/85
4,499,798                   06/492,649                   02/19/85
4,499,812                   06/540,076                   02/19/85
4,499,814                   06/448,414                   02/19/85
4,499,825                   06/447,880                   02/19/85
4,499,826                   06/451,346                   02/19/85
4,499,832                   06/565,222                   02/19/85
4,499,834                   06/448,432                   02/19/85
4,499,837                   06/496,683                   02/19/85
4,499,842                   06/483,913                   02/19/85
4,499,866                   06/580,424                   02/19/85
4,499,868                   06/404,145                   02/19/85
4,499,871                   06/520,147                   02/19/85
4,499,877                   06/329,352                   02/19/85
4,499,890                   06/311,949                   02/19/85
4,499,892                   06/485,130                   02/19/85
4,499,898                   06/410,476                   02/19/85
4,499,902                   06/355,576                   02/19/85
4,499,906                   06/483,881                   02/19/85
4,499,907                   06/441,887                   02/19/85
4,499,920                   06/378,563                   02/19/85
4,499,921                   06/327,646                   02/19/85
4,499,924                   06/357,783                   02/19/85
4,499,928                   06/593,994                   02/19/85
4,499,933                   06/400,278                   02/19/85
4,499,938                   06/457,682                   02/19/85
4,499,941                   06/393,686                   02/19/85
4,499,944                   06/466,945                   02/19/85
4,499,946                   06/242,372                   02/19/85
4,499,950                   06/499,069                   02/19/85
4,499,951                   06/493,018                   02/19/85
4,499,952                   06/268,236                   02/19/85
4,499,963                   06/628,133                   02/19/85
4,499,972                   06/441,519                   02/19/85
4,499,973                   06/478,440                   02/19/85
4,499,974                   06/527,886                   02/19/85
4,499,986                   06/351,767                   02/19/85
4,500,000                   06/588,567                   02/19/85
4,500,011                   06/580,752                   02/19/85
4,500,017                   06/420,775                   02/19/85
4,500,019                   06/507,284                   02/19/85
4,500,028                   06/546,665                   02/19/85
4,500,041                   06/446,604                   02/19/85
4,500,044                   06/521,505                   02/19/85
4,500,046                   06/443,649                   02/19/85
4,500,049                   06/413,842                   02/19/85
4,500,052                   06/240,619                   02/19/85
4,500,054                   06/539,736                   02/19/85
4,500,065                   06/353,512                   02/19/85
4,500,073                   06/426,838                   02/19/85
4,500,076                   06/628,975                   02/19/85
4,500,082                   06/556,921                   02/19/85
4,500,083                   06/559,398                   02/19/85
4,500,088                   06/508,552                   02/19/85
4,500,095                   06/548,391                   02/19/85
4,500,096                   06/468,348                   02/19/85
4,500,101                   06/563,889                   02/19/85
4,500,105                   06/495,275                   02/19/85
4,500,110                   06/484,725                   02/19/85
4,500,115                   06/444,503                   02/19/85
4,500,117                   06/444,416                   02/19/85
4,500,120                   06/452,142                   02/19/85
4,500,121                   06/514,125                   02/19/85
4,500,125                   06/588,569                   02/19/85
4,500,133                   06/414,091                   02/19/85
4,500,135                   06/486,704                   02/19/85
4,500,151                   06/443,000                   02/19/85
4,500,152                   06/430,608                   02/19/85
4,500,155                   06/358,990                   02/19/85
4,500,157                   06/420,763                   02/19/85
4,500,160                   06/612,745                   02/19/85
4,500,167                   06/441,705                   02/19/85
4,500,170                   06/388,290                   02/19/85
4,500,171                   06/384,356                   02/19/85
4,500,178                   06/310,562                   02/19/85
4,500,181                   06/381,885                   02/19/85
4,500,197                   06/481,507                   02/19/85
4,500,198                   06/448,577                   02/19/85
4,500,201                   06/540,911                   02/19/85
4,500,214                   06/424,238                   02/19/85
4,500,217                   06/441,313                   02/19/85
4,500,223                   06/531,883                   02/19/85
4,500,227                   06/491,395                   02/19/85
4,500,244                   06/450,994                   02/19/85
4,500,251                   06/463,016                   02/19/85
4,500,257                   06/469,348                   02/19/85
4,500,258                   06/497,585                   02/19/85
4,500,263                   06/629,733                   02/19/85
4,500,268                   06/430,828                   02/19/85
4,500,272                   06/491,445                   02/19/85
4,500,274                   06/488,755                   02/19/85
4,500,279                   06/510,440                   02/19/85
4,500,280                   06/513,385                   02/19/85
4,500,286                   06/507,186                   02/19/85
4,500,302                   06/539,176                   02/19/85
4,500,303                   06/336,333                   02/19/85
4,500,312                   06/450,025                   02/19/85
4,500,318                   06/521,709                   02/19/85
4,500,320                   06/469,420                   02/19/85
4,500,321                   06/468,630                   02/19/85
4,500,325                   06/398,595                   02/19/85
4,500,331                   06/456,371                   02/19/85
4,500,333                   06/556,249                   02/19/85
4,500,336                   06/390,044                   02/19/85
4,500,343                   06/429,765                   02/19/85
4,500,348                   06/355,076                   02/19/85
4,500,357                   06/596,228                   02/19/85
4,500,365                   06/467,188                   02/19/85
4,500,375                   06/361,403                   02/19/85
4,500,376                   06/502,658                   02/19/85
4,500,380                   06/563,199                   02/19/85
4,500,383                   06/465,043                   02/19/85
4,500,385                   06/597,712                   02/19/85
4,500,391                   06/541,631                   02/19/85
4,500,396                   06/574,048                   02/19/85
4,500,398                   06/622,515                   02/19/85
4,500,399                   06/534,010                   02/19/85
4,500,404                   06/332,957                   02/19/85
4,500,405                   06/568,515                   02/19/85
4,500,411                   06/500,098                   02/19/85
4,500,412                   06/404,900                   02/19/85
4,500,423                   06/503,781                   02/19/85
4,500,426                   06/334,082                   02/19/85
4,500,430                   06/421,082                   02/19/85
4,500,431                   06/548,828                   02/19/85
4,500,438                   06/507,407                   02/19/85
4,500,439                   06/542,011                   02/19/85
4,500,459                   06/357,664                   02/19/85
4,500,460                   06/524,269                   02/19/85
4,500,463                   06/259,772                   02/19/85
4,500,468                   06/554,088                   02/19/85
4,500,469                   06/584,071                   02/19/85
4,500,470                   06/486,122                   02/19/85
4,500,485                   06/518,223                   02/19/85
4,500,487                   06/352,603                   02/19/85
4,500,489                   06/445,714                   02/19/85
4,500,495                   06/519,180                   02/19/85
4,500,502                   06/508,469                   02/19/85
4,500,504                   06/460,796                   02/19/85
4,500,508                   06/491,132                   02/19/85
4,500,515                   06/479,713                   02/19/85
4,500,518                   06/602,030                   02/19/85
4,500,520                   06/471,201                   02/19/85
4,500,525                   06/466,701                   02/19/85
4,500,526                   06/541,593                   02/19/85
4,500,527                   06/506,732                   02/19/85
4,500,528                   06/471,593                   02/19/85
4,500,530                   06/421,803                   02/19/85
4,500,531                   06/461,701                   02/19/85
4,500,532                   06/471,592                   02/19/85
4,500,534                   06/504,524                   02/19/85
4,500,540                   06/387,721                   02/19/85
4,500,549                   06/472,735                   02/19/85
4,500,553                   06/519,353                   02/19/85
4,500,555                   06/549,110                   02/19/85
4,500,572                   06/509,652                   02/19/85
4,500,577                   06/557,388                   02/19/85
4,500,595                   06/400,779                   02/19/85
4,500,598                   06/467,907                   02/19/85
4,500,606                   06/552,635                   02/19/85
4,500,616                   06/419,940                   02/19/85
4,500,621                   06/483,888                   02/19/85
4,500,642                   06/472,272                   02/19/85
4,500,643                   06/565,622                   02/19/85
4,500,649                   06/433,690                   02/19/85
4,500,653                   06/531,982                   02/19/85
4,500,654                   06/547,691                   02/19/85
4,500,657                   06/509,770                   02/19/85
4,500,667                   06/545,704                   02/19/85
4,500,670                   06/554,156                   02/19/85
4,500,672                   06/548,128                   02/19/85
4,500,681                   06/453,727                   02/19/85
4,500,684                   06/567,287                   02/19/85
4,500,687                   06/275,071                   02/19/85
4,500,691                   06/568,685                   02/19/85
4,500,694                   06/491,234                   02/19/85
4,500,696                   06/622,178                   02/19/85
4,500,697                   06/622,180                   02/19/85
4,500,698                   06/622,196                   02/19/85
4,500,702                   06/550,871                   02/19/85
4,500,705                   06/569,572                   02/19/85
4,500,708                   06/602,782                   02/19/85
4,500,709                   06/428,658                   02/19/85
4,500,713                   06/421,921                   02/19/85
4,500,721                   06/468,909                   02/19/85
4,500,723                   06/494,235                   02/19/85
4,500,751                   06/400,060                   02/19/85
4,500,760                   06/420,839                   02/19/85
4,500,780                   06/455,163                   02/19/85
4,500,784                   06/428,072                   02/19/85
4,500,786                   06/370,333                   02/19/85
4,500,787                   06/404,044                   02/19/85
4,500,788                   06/524,704                   02/19/85
4,500,790                   06/435,174                   02/19/85
4,500,802                   06/390,472                   02/19/85
4,500,807                   06/455,280                   02/19/85
4,500,810                   06/513,258                   02/19/85
4,500,813                   06/402,785                   02/19/85
4,500,819                   06/550,245                   02/19/85
4,500,827                   06/619,080                   02/19/85
4,500,829                   06/538,391                   02/19/85
4,500,830                   06/408,771                   02/19/85
4,500,831                   06/453,329                   02/19/85
4,500,835                   06/383,588                   02/19/85
4,500,847                   06/388,291                   02/19/85
4,500,854                   06/255,675                   02/19/85
4,500,855                   06/387,068                   02/19/85
4,500,858                   06/448,689                   02/19/85
4,500,861                   06/467,244                   02/19/85
4,500,866                   06/488,316                   02/19/85
4,500,870                   06/306,901                   02/19/85
4,500,883                   06/472,793                   02/19/85
4,500,891                   06/458,876                   02/19/85
4,500,903                   06/384,520                   02/19/85
4,500,904                   06/544,119                   02/19/85
4,500,907                   06/419,477                   02/19/85
4,500,909                   06/457,949                   02/19/85
4,500,915                   06/423,446                   02/19/85
4,500,921                   06/400,195                   02/19/85
4,500,922                   06/441,698                   02/19/85
4,500,925                   06/390,643                   02/19/85
4,500,927                   06/459,557                   02/19/85
4,500,932                   06/384,602                   02/19/85
4,500,935                   06/411,974                   02/19/85
4,500,948                   06/539,852                   02/19/85
4,500,949                   06/465,839                   02/19/85
4,500,950                   06/367,830                   02/19/85
4,500,954                   06/311,570                   02/19/85
4,500,955                   06/336,193                   02/19/85
4,500,957                   06/360,989                   02/19/85
4,500,959                   06/375,587                   02/19/85
4,500,966                   06/382,258                   02/19/85
4,500,970                   06/339,426                   02/19/85
4,500,971                   06/363,387                   02/19/85
4,500,979                   06/302,873                   02/19/85
4,803,748                   07/158,754                   02/14/89
4,803,757                   06/430,582                   02/14/89
4,803,761                   06/927,763                   02/14/89
4,803,764                   07/063,297                   02/14/89
4,803,765                   07/184,436                   02/14/89
4,803,768                   07/015,046                   02/14/89
4,803,770                   06/414,209                   02/14/89
4,803,776                   07/108,204                   02/14/89
4,803,778                   07/087,733                   02/14/89
4,803,779                   07/088,550                   02/14/89
4,803,780                   06/908,330                   02/14/89
4,803,781                   06/401,366                   02/14/89
4,803,782                   07/124,267                   02/14/89
4,803,783                   07/062,460                   02/14/89
4,803,785                   07/001,025                   02/14/89
4,803,786                   06/941,679                   02/14/89
4,803,787                   06/889,931                   02/14/89
4,803,788                   07/145,820                   02/14/89
4,803,792                   07/114,060                   02/14/89
4,803,793                   07/136,720                   02/14/89
4,803,801                   07/053,389                   02/14/89
4,803,802                   06/637,966                   02/14/89
4,803,807                   07/072,020                   02/14/89
4,803,809                   07/137,730                   02/14/89
4,803,811                   06/880,078                   02/14/89
4,803,815                   07/188,289                   02/14/89
4,803,819                   06/925,976                   02/14/89
4,803,823                   07/043,490                   02/14/89
4,803,824                   06/808,602                   02/14/89
4,803,835                   07/031,260                   02/14/89
4,803,839                   07/138,592                   02/14/89
4,803,845                   07/148,629                   02/14/89
4,803,846                   06/600,882                   02/14/89
4,803,848                   07/065,306                   02/14/89
4,803,853                   07/070,917                   02/14/89
4,803,856                   07/211,919                   02/14/89
4,803,858                   07/180,358                   02/14/89
4,803,860                   07/077,241                   02/14/89
4,803,861                   07/003,830                   02/14/89
4,803,865                   07/074,794                   02/14/89
4,803,870                   07/012,680                   02/14/89
4,803,872                   06/542,549                   02/14/89
4,803,874                   06/947,751                   02/14/89
4,803,876                   07/208,586                   02/14/89
4,803,877                   07/035,566                   02/14/89
4,803,879                   07/010,532                   02/14/89
4,803,881                   07/009,454                   02/14/89
4,803,885                   07/039,390                   02/14/89
4,803,886                   07/143,673                   02/14/89
4,803,894                   06/941,581                   02/14/89
4,803,903                   07/097,869                   02/14/89
4,803,907                   07/120,099                   02/14/89
4,803,910                   07/102,631                   02/14/89
4,803,915                   07/023,799                   02/14/89
4,803,918                   07/042,413                   02/14/89
4,803,919                   07/058,284                   02/14/89
4,803,920                   07/144,314                   02/14/89
4,803,924                   07/155,910                   02/14/89
4,803,927                   07/003,527                   02/14/89
4,803,928                   07/076,148                   02/14/89
4,803,931                   06/849,665                   02/14/89
4,803,935                   07/090,542                   02/14/89
4,803,937                   07/157,388                   02/14/89
4,803,939                   07/090,677                   02/14/89
4,803,941                   07/115,520                   02/14/89
4,803,942                   06/936,890                   02/14/89
4,803,948                   07/036,803                   02/14/89
4,803,951                   07/104,347                   02/14/89
4,803,953                   07/104,292                   02/14/89
4,803,958                   07/094,391                   02/14/89
4,803,960                   07/056,425                   02/14/89
4,803,964                   06/940,289                   02/14/89
4,803,969                   07/069,205                   02/14/89
4,803,970                   07/058,865                   02/14/89
4,803,972                   07/142,250                   02/14/89
4,803,979                   07/054,804                   02/14/89
4,803,983                   07/195,429                   02/14/89
4,803,984                   07/070,076                   02/14/89
4,804,001                   07/056,612                   02/14/89
4,804,005                   07/188,693                   02/14/89
4,804,014                   06/860,358                   02/14/89
4,804,017                   07/157,514                   02/14/89
4,804,022                   07/134,384                   02/14/89
4,804,027                   07/098,343                   02/14/89
4,804,030                   07/198,664                   02/14/89
4,804,036                   07/188,454                   02/14/89
4,804,039                   07/063,260                   02/14/89
4,804,042                   07/124,736                   02/14/89
4,804,043                   07/068,290                   02/14/89
4,804,046                   07/067,479                   02/14/89
4,804,047                   06/931,743                   02/14/89
4,804,049                   06/676,710                   02/14/89
4,804,054                   07/055,986                   02/14/89
4,804,055                   07/098,217                   02/14/89
4,804,056                   07/110,816                   02/14/89
4,804,058                   07/136,932                   02/14/89
4,804,060                   07/104,182                   02/14/89
4,804,063                   07/220,574                   02/14/89
4,804,066                   07/047,087                   02/14/89
4,804,078                   07/013,985                   02/14/89
4,804,081                   06/925,615                   02/14/89
4,804,084                   07/112,612                   02/14/89
4,804,086                   07/133,810                   02/14/89
4,804,094                   07/120,627                   02/14/89
4,804,096                   07/184,978                   02/14/89
4,804,101                   07/162,960                   02/14/89
4,804,104                   07/168,428                   02/14/89
4,804,107                   07/164,199                   02/14/89
4,804,114                   07/073,694                   02/14/89
4,804,116                   07/091,385                   02/14/89
4,804,118                   06/930,410                   02/14/89
4,804,126                   06/941,051                   02/14/89
4,804,127                   07/098,930                   02/14/89
4,804,128                   06/937,888                   02/14/89
4,804,130                   07/063,473                   02/14/89
4,804,138                   07/188,516                   02/14/89
4,804,144                   06/303,777                   02/14/89
4,804,146                   06/936,198                   02/14/89
4,804,152                   07/053,340                   02/14/89
4,804,155                   07/020,352                   02/14/89
4,804,159                   07/150,748                   02/14/89
4,804,160                   07/116,175                   02/14/89
4,804,167                   07/067,470                   02/14/89
4,804,175                   07/069,104                   02/14/89
4,804,178                   07/122,459                   02/14/89
4,804,181                   07/097,697                   02/14/89
4,804,182                   06/906,266                   02/14/89
4,804,183                   07/172,090                   02/14/89
4,804,184                   07/102,061                   02/14/89
4,804,187                   07/100,540                   02/14/89
4,804,188                   07/058,819                   02/14/89
4,804,190                   07/061,828                   02/14/89
4,804,191                   07/073,057                   02/14/89
4,804,194                   07/108,965                   02/14/89
4,804,198                   06/945,967                   02/14/89
4,804,199                   07/124,379                   02/14/89
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