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 January 15, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,431                  07/384,270                   11/13/90
(4,796,324)                (07/101,371)                (01/10/89)
Re. 34,163                  07/668,101                   01/19/93
(4,797,775)                (06/854,246)                (01/10/89)
4,493,115                   06/384,922                   01/15/85
4,493,124                   06/436,696                   01/15/85
4,493,125                   06/474,805                   01/15/85
4,493,129                   06/366,765                   01/15/85
4,493,130                   06/434,559                   01/15/85
4,493,132                   06/439,540                   01/15/85
4,493,144                   06/397,275                   01/15/85
4,493,152                   06/529,677                   01/15/85
4,493,157                   06/523,377                   01/15/85
4,493,164                   06/407,470                   01/15/85
4,493,168                   06/505,020                   01/15/85
4,493,173                   06/227,799                   01/15/85
4,493,181                   06/609,589                   01/15/85
4,493,183                   06/422,057                   01/15/85
4,493,185                   06/478,787                   01/15/85
4,493,192                   06/493,503                   01/15/85
4,493,205                   06/427,173                   01/15/85
4,493,210                   06/474,574                   01/15/85
4,493,212                   06/420,361                   01/15/85
4,493,215                   06/388,890                   01/15/85
4,493,217                   06/408,862                   01/15/85
4,493,224                   06/384,841                   01/15/85
4,493,225                   06/430,876                   01/15/85
4,493,236                   06/516,837                   01/15/85
4,493,244                   06/386,550                   01/15/85
4,493,252                   06/473,414                   01/15/85
4,493,265                   06/390,673                   01/15/85
4,493,270                   06/550,500                   01/15/85
4,493,273                   06/437,802                   01/15/85
4,493,276                   06/400,713                   01/15/85
4,493,280                   06/426,953                   01/15/85
4,493,283                   06/497,760                   01/15/85
4,493,287                   06/446,441                   01/15/85
4,493,295                   06/511,477                   01/15/85
4,493,298                   06/391,035                   01/15/85
4,493,302                   06/454,024                   01/15/85
4,493,304                   06/559,605                   01/15/85
4,493,306                   06/582,976                   01/15/85
4,493,307                   06/517,170                   01/15/85
4,493,311                   06/543,336                   01/15/85
4,493,320                   06/364,977                   01/15/85
4,493,327                   06/400,150                   01/15/85
4,493,333                   06/494,383                   01/15/85
4,493,334                   06/429,111                   01/15/85
4,493,341                   06/442,272                   01/15/85
4,493,342                   06/545,001                   01/15/85
4,493,347                   06/416,261                   01/15/85
4,493,356                   06/526,680                   01/15/85
4,493,360                   06/527,510                   01/15/85
4,493,362                   06/382,528                   01/15/85
4,493,364                   06/325,970                   01/15/85
4,493,371                   06/518,711                   01/15/85
4,493,373                   06/522,986                   01/15/85
4,493,377                   06/313,648                   01/15/85
4,493,379                   06/469,951                   01/15/85
4,493,388                   06/370,863                   01/15/85
4,493,391                   06/383,966                   01/15/85
4,493,397                   06/405,895                   01/15/85
4,493,404                   06/443,512                   01/15/85
4,493,405                   06/353,619                   01/15/85
4,493,406                   06/499,617                   01/15/85
4,493,414                   06/549,226                   01/15/85
4,493,423                   06/478,363                   01/15/85
4,493,429                   06/451,548                   01/15/85
4,493,431                   06/369,252                   01/15/85
4,493,439                   06/568,281                   01/15/85
4,493,441                   06/320,478                   01/15/85
4,493,444                   06/347,321                   01/15/85
4,493,448                   06/458,544                   01/15/85
4,493,465                   06/369,481                   01/15/85
4,493,469                   06/459,044                   01/15/85
4,493,470                   06/521,458                   01/15/85
4,493,472                   06/416,401                   01/15/85
4,493,482                   06/536,289                   01/15/85
4,493,488                   06/348,719                   01/15/85
4,493,492                   06/360,992                   01/15/85
4,493,501                   06/485,315                   01/15/85
4,493,507                   06/492,329                   01/15/85
4,493,515                   06/368,762                   01/15/85
4,493,516                   06/452,297                   01/15/85
4,493,517                   06/595,647                   01/15/85
4,493,518                   06/520,397                   01/15/85
4,493,521                   06/453,400                   01/15/85
4,493,525                   06/462,278                   01/15/85
4,493,526                   06/458,518                   01/15/85
4,493,529                   06/403,446                   01/15/85
4,493,534                   06/351,958                   01/15/85
4,493,537                   06/439,293                   01/15/85
4,493,545                   06/315,435                   01/15/85
4,493,547                   06/565,317                   01/15/85
4,493,549                   06/538,942                   01/15/85
4,493,551                   06/478,325                   01/15/85
4,493,555                   06/421,686                   01/15/85
4,493,564                   06/424,602                   01/15/85
4,493,582                   06/574,454                   01/15/85
4,493,583                   06/535,784                   01/15/85
4,493,589                   06/463,212                   01/15/85
4,493,590                   06/339,607                   01/15/85
4,493,592                   06/425,346                   01/15/85
4,493,603                   06/346,552                   01/15/85
4,493,604                   06/434,348                   01/15/85
4,493,608                   06/453,535                   01/15/85
4,493,610                   06/436,715                   01/15/85
4,493,612                   06/431,476                   01/15/85
4,493,615                   06/557,581                   01/15/85
4,493,617                   06/472,074                   01/15/85
4,493,623                   06/468,066                   01/15/85
4,493,628                   06/512,937                   01/15/85
4,493,629                   06/565,264                   01/15/85
4,493,635                   06/465,679                   01/15/85
4,493,643                   06/454,687                   01/15/85
4,493,644                   06/548,000                   01/15/85
4,493,655                   06/520,705                   01/15/85
4,493,673                   06/429,522                   01/15/85
4,493,676                   06/467,212                   01/15/85
4,493,677                   06/454,455                   01/15/85
4,493,678                   06/387,618                   01/15/85
4,493,685                   06/418,549                   01/15/85
4,493,688                   06/428,937                   01/15/85
4,493,689                   06/356,740                   01/15/85
4,493,691                   06/474,925                   01/15/85
4,493,697                   06/292,991                   01/15/85
4,493,708                   06/420,814                   01/15/85
4,493,709                   06/342,100                   01/15/85
4,493,715                   06/595,134                   01/15/85
4,493,718                   06/480,783                   01/15/85
4,493,722                   06/411,186                   01/15/85
4,493,734                   06/497,379                   01/15/85
4,493,740                   06/384,030                   01/15/85
4,493,746                   06/592,624                   01/15/85
4,493,752                   06/371,461                   01/15/85
4,493,753                   06/502,721                   01/15/85
4,493,755                   06/530,135                   01/15/85
4,493,756                   06/506,364                   01/15/85
4,493,758                   06/547,598                   01/15/85
4,493,760                   06/559,025                   01/15/85
4,493,763                   06/513,824                   01/15/85
4,493,777                   06/451,132                   01/15/85
4,493,784                   06/575,109                   01/15/85
4,493,786                   06/414,443                   01/15/85
4,493,789                   06/473,213                   01/15/85
4,493,794                   06/328,997                   01/15/85
4,493,798                   06/299,690                   01/15/85
4,493,799                   06/425,788                   01/15/85
4,493,800                   06/506,358                   01/15/85
4,493,801                   06/317,001                   01/15/85
4,493,803                   06/507,510                   01/15/85
4,493,806                   06/268,385                   01/15/85
4,493,824                   06/405,280                   01/15/85
4,493,831                   06/537,967                   01/15/85
4,493,839                   06/380,989                   01/15/85
4,493,845                   06/434,818                   01/15/85
4,493,854                   06/534,015                   01/15/85
4,493,856                   06/359,469                   01/15/85
4,493,861                   06/449,043                   01/15/85
4,493,864                   06/394,092                   01/15/85
4,493,865                   06/541,995                   01/15/85
4,493,878                   06/482,723                   01/15/85
4,493,883                   06/581,926                   01/15/85
4,493,885                   06/491,788                   01/15/85
4,493,887                   06/458,124                   01/15/85
4,493,890                   06/404,427                   01/15/85
4,493,895                   06/404,344                   01/15/85
4,493,896                   06/434,309                   01/15/85
4,493,900                   06/463,937                   01/15/85
4,493,909                   06/386,129                   01/15/85
4,493,915                   06/546,136                   01/15/85
4,493,916                   06/527,517                   01/15/85
4,493,917                   06/548,532                   01/15/85
4,493,924                   06/501,301                   01/15/85
4,493,927                   06/564,522                   01/15/85
4,493,929                   06/458,812                   01/15/85
4,493,934                   06/421,594                   01/15/85
4,493,935                   06/576,202                   01/15/85
4,493,938                   06/253,144                   01/15/85
4,493,941                   06/525,903                   01/15/85
4,493,942                   06/458,885                   01/15/85
4,493,944                   06/568,029                   01/15/85
4,493,952                   06/527,042                   01/15/85
4,493,954                   06/456,070                   01/15/85
4,493,958                   06/536,637                   01/15/85
4,493,959                   06/472,637                   01/15/85
4,493,967                   06/414,191                   01/15/85
4,493,969                   06/550,242                   01/15/85
4,493,971                   06/455,178                   01/15/85
4,493,973                   06/547,022                   01/15/85
4,493,979                   06/465,055                   01/15/85
4,493,983                   06/486,665                   01/15/85
4,493,985                   06/489,253                   01/15/85
4,494,010                   06/406,138                   01/15/85
4,494,014                   06/391,265                   01/15/85
4,494,015                   06/347,031                   01/15/85
4,494,016                   06/401,484                   01/15/85
4,494,017                   06/363,166                   01/15/85
4,494,022                   06/592,583                   01/15/85
4,494,040                   06/435,181                   01/15/85
4,494,041                   06/463,226                   01/15/85
4,494,046                   06/572,600                   01/15/85
4,494,050                   06/540,617                   01/15/85
4,494,061                   06/625,187                   01/15/85
4,494,064                   06/436,550                   01/15/85
4,494,070                   06/337,949                   01/15/85
4,494,076                   06/478,523                   01/15/85
4,494,080                   06/321,508                   01/15/85
4,494,086                   06/403,760                   01/15/85
4,494,089                   06/358,607                   01/15/85
4,494,093                   06/437,935                   01/15/85
4,494,097                   06/575,956                   01/15/85
4,494,098                   06/568,567                   01/15/85
4,494,102                   06/413,288                   01/15/85
4,494,106                   06/349,757                   01/15/85
4,494,108                   06/617,303                   01/15/85
4,494,109                   06/229,175                   01/15/85
4,494,116                   06/298,633                   01/15/85
4,494,118                   06/524,274                   01/15/85
4,494,123                   06/520,766                   01/15/85
4,494,125                   06/472,924                   01/15/85
4,494,126                   06/465,412                   01/15/85
4,494,130                   06/398,630                   01/15/85
4,494,131                   06/315,505                   01/15/85
4,494,137                   06/388,824                   01/15/85
4,494,140                   06/340,619                   01/15/85
4,494,145                   06/416,645                   01/15/85
4,494,152                   06/332,778                   01/15/85
4,494,154                   06/286,221                   01/15/85
4,494,164                   06/364,729                   01/15/85
4,494,167                   06/364,965                   01/15/85
4,494,174                   06/424,808                   01/15/85
4,494,175                   06/569,002                   01/15/85
4,494,179                   06/464,695                   01/15/85
4,494,182                   06/458,109                   01/15/85
4,494,186                   06/286,444                   01/15/85
4,494,189                   06/371,754                   01/15/85
4,494,190                   06/377,299                   01/15/85
4,494,194                   06/430,575                   01/15/85
4,494,200                   06/338,627                   01/15/85
4,494,202                   06/421,538                   01/15/85
4,494,203                   06/367,959                   01/15/85
4,494,207                   06/368,737                   01/15/85
4,494,208                   06/368,738                   01/15/85
4,494,211                   06/444,139                   01/15/85
4,494,213                   06/387,642                   01/15/85
4,494,215                   06/437,159                   01/15/85
4,494,228                   06/407,409                   01/15/85
4,796,309                   07/105,504                   01/10/89
4,796,316                   07/119,507                   01/10/89
4,796,323                   06/948,051                   01/10/89
4,796,329                   07/029,624                   01/10/89
4,796,340                   06/921,363                   01/10/89
4,796,348                   07/058,401                   01/10/89
4,796,354                   07/027,832                   01/10/89
4,796,357                   07/155,773                   01/10/89
4,796,360                   07/114,657                   01/10/89
4,796,362                   07/089,809                   01/10/89
4,796,363                   07/142,192                   01/10/89
4,796,364                   07/141,041                   01/10/89
4,796,368                   07/056,438                   01/10/89
4,796,371                   07/193,603                   01/10/89
4,796,383                   06/868,263                   01/10/89
4,796,391                   07/124,570                   01/10/89
4,796,393                   06/764,296                   01/10/89
4,796,394                   07/119,969                   01/10/89
4,796,395                   07/001,591                   01/10/89
4,796,406                   07/058,164                   01/10/89
4,796,407                   07/079,517                   01/10/89
4,796,409                   07/061,881                   01/10/89
4,796,411                   07/048,538                   01/10/89
4,796,419                   07/007,200                   01/10/89
4,796,421                   07/149,178                   01/10/89
4,796,425                   07/105,702                   01/10/89
4,796,428                   06/458,598                   01/10/89
4,796,430                   07/085,536                   01/10/89
4,796,431                   06/885,868                   01/10/89
4,796,437                   07/111,635                   01/10/89
4,796,438                   07/114,013                   01/10/89
4,796,445                   06/941,597                   01/10/89
4,796,448                   07/140,904                   01/10/89
4,796,453                   07/063,327                   01/10/89
4,796,458                   07/086,948                   01/10/89
4,796,459                   07/093,888                   01/10/89
4,796,464                   07/114,331                   01/10/89
4,796,468                   07/022,213                   01/10/89
4,796,472                   07/071,776                   01/10/89
4,796,485                   06/782,496                   01/10/89
4,796,489                   07/042,528                   01/10/89
4,796,492                   07/196,311                   01/10/89
4,796,497                   06/946,210                   01/10/89
4,796,504                   06/891,924                   01/10/89
4,796,509                   07/122,112                   01/10/89
4,796,510                   07/118,674                   01/10/89
4,796,511                   06/768,017                   01/10/89
4,796,512                   07/106,952                   01/10/89
4,796,515                   07/002,740                   01/10/89
4,796,517                   07/067,009                   01/10/89
4,796,536                   07/065,509                   01/10/89
4,796,542                   07/063,261                   01/10/89
4,796,544                   06/918,999                   01/10/89
4,796,551                   07/117,468                   01/10/89
4,796,552                   07/050,360                   01/10/89
4,796,553                   06/935,821                   01/10/89
4,796,554                   07/038,691                   01/10/89
4,796,559                   07/051,142                   01/10/89
4,796,563                   07/039,708                   01/10/89
4,796,564                   06/837,890                   01/10/89
4,796,571                   07/132,152                   01/10/89
4,796,573                   07/103,879                   01/10/89
4,796,580                   07/095,085                   01/10/89
4,796,590                   06/802,723                   01/10/89
4,796,592                   06/871,135                   01/10/89
4,796,596                   07/093,815                   01/10/89
4,796,613                   06/912,043                   01/10/89
4,796,615                   06/920,290                   01/10/89
4,796,616                   07/090,955                   01/10/89
4,796,618                   06/820,845                   01/10/89
4,796,619                   06/837,089                   01/10/89
4,796,621                   07/130,301                   01/10/89
4,796,622                   07/026,540                   01/10/89
4,796,623                   07/075,842                   01/10/89
4,796,624                   06/932,638                   01/10/89
4,796,635                   07/013,592                   01/10/89
4,796,638                   07/169,144                   01/10/89
4,796,650                   07/127,263                   01/10/89
4,796,652                   07/076,220                   01/10/89
4,796,654                   07/141,946                   01/10/89
4,796,657                   07/189,029                   01/10/89
4,796,658                   07/068,385                   01/10/89
4,796,665                   07/009,738                   01/10/89
4,796,668                   06/763,140                   01/10/89
4,796,677                   07/069,011                   01/10/89
4,796,679                   07/005,636                   01/10/89
4,796,680                   07/036,004                   01/10/89
4,796,682                   07/116,369                   01/10/89
4,796,689                   07/167,536                   01/10/89
4,796,692                   06/932,510                   01/10/89
4,796,694                   06/869,694                   01/10/89
4,796,703                   07/086,060                   01/10/89
4,796,717                   07/136,956                   01/10/89
4,796,721                   07/070,751                   01/10/89
4,796,723                   06/936,618                   01/10/89
4,796,731                   07/042,295                   01/10/89
4,796,735                   07/045,456                   01/10/89
4,796,744                   07/078,661                   01/10/89
4,796,756                   07/180,225                   01/10/89
4,796,757                   07/055,887                   01/10/89
4,796,758                   07/092,166                   01/10/89
4,796,759                   07/139,306                   01/10/89
4,796,763                   06/942,525                   01/10/89
4,796,764                   07/112,668                   01/10/89
4,796,766                   06/364,563                   01/10/89
4,796,767                   07/093,723                   01/10/89
4,796,768                   07/148,468                   01/10/89
4,796,772                   07/183,498                   01/10/89
4,796,773                   07/044,029                   01/10/89
4,796,774                   07/074,065                   01/10/89
4,796,775                   07/123,898                   01/10/89
4,796,777                   07/138,150                   01/10/89
4,796,779                   07/142,010                   01/10/89
4,796,782                   06/792,745                   01/10/89
4,796,785                   07/086,938                   01/10/89
4,796,786                   07/047,570                   01/10/89
4,796,792                   07/077,123                   01/10/89
4,796,795                   07/107,200                   01/10/89
4,796,798                   07/060,084                   01/10/89
4,796,801                   07/133,545                   01/10/89
4,796,804                   07/089,566                   01/10/89
4,796,806                   07/030,961                   01/10/89
4,796,809                   07/049,843                   01/10/89
4,796,813                   07/161,310                   01/10/89
4,796,815                   07/174,559                   01/10/89
4,796,829                   07/105,623                   01/10/89
4,796,831                   07/109,076                   01/10/89
4,796,836                   07/010,360                   01/10/89
4,796,837                   07/182,103                   01/10/89
4,796,848                   07/031,582                   01/10/89
4,796,857                   07/128,282                   01/10/89
4,796,862                   07/128,990                   01/10/89
4,796,871                   07/061,826                   01/10/89
4,796,877                   07/164,535                   01/10/89
4,796,880                   06/947,074                   01/10/89
4,796,888                   06/885,609                   01/10/89
4,796,889                   07/133,725                   01/10/89
4,796,894                   07/069,838                   01/10/89
4,796,896                   07/156,344                   01/10/89
4,796,902                   07/061,286                   01/10/89
4,796,904                   07/025,583                   01/10/89
4,796,905                   06/926,142                   01/10/89
4,796,906                   06/794,306                   01/10/89
4,796,916                   07/134,171                   01/10/89
4,796,919                   07/143,639                   01/10/89
4,796,929                   07/092,102                   01/10/89
4,796,930                   07/087,028                   01/10/89
4,796,931                   07/082,749                   01/10/89
4,796,933                   07/026,549                   01/10/89
4,796,959                   07/071,960                   01/10/89
4,796,960                   07/098,219                   01/10/89
4,796,982                   06/629,842                   01/10/89
4,796,991                   07/051,719                   01/10/89
4,796,999                   07/025,144                   01/10/89
4,797,002                   06/877,120                   01/10/89
4,797,004                   07/101,858                   01/10/89
4,797,007                   07/134,974                   01/10/89
4,797,011                   07/141,741                   01/10/89
4,797,018                   07/105,893                   01/10/89
4,797,027                   07/061,367                   01/10/89
4,797,028                   07/212,904                   01/10/89
4,797,036                   07/137,931                   01/10/89
4,797,039                   07/102,063                   01/10/89
4,797,041                   07/137,151                   01/10/89
4,797,052                   06/885,451                   01/10/89
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