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.

                     PAENTS WHICH EXPIRED December 3, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number                   Serial Number                    Issue Date

Re. 32,946                       07/105,137                       06/13/89
4,555,893                       (06/586,421)                     (12/03/85)
Re. 33,418                       07/122,266                       11/06/90
4,556,440                       (06/603,096)                     (12/03/85)
4,555,819                        06/606,825                       12/03/85
4,555,821                        06/605,598                       12/03/85
4,555,828                        06/604,577                       12/03/85
4,555,843                        06/604,804                       12/03/85
4,555,847                        06/618,982                       12/03/85
4,555,850                        06/547,053                       12/03/85
4,555,859                        06/518,888                       12/03/85
4,555,874                        06/552,770                       12/03/85
4,555,881                        06/722,769                       12/03/85
4,555,883                        06/524,239                       12/03/85
4,555,895                        06/557,932                       12/03/85
4,555,899                        06/437,268                       12/03/85
4,555,906                        06/664,639                       12/03/85
4,555,912                        06/506,289                       12/03/85
4,555,915                        06/677,674                       12/03/85
4,555,920                        06/618,685                       12/03/85
4,555,924                        06/562,474                       12/03/85
4,555,926                        06/571,246                       12/03/85
4,555,931                        06/482,313                       12/03/85
4,555,936                        06/685,009                       12/03/85
4,555,939                        06/590,673                       12/03/85
4,555,948                        06/541,856                       12/03/85
4,555,949                        06/607,080                       12/03/85
4,555,950                        06/625,161                       12/03/85
4,555,951                        06/643,560                       12/03/85
4,555,956                        06/645,540                       12/03/85
4,555,962                        06/558,793                       12/03/85
4,555,967                        06/523,793                       12/03/85
4,555,972                        06/451,566                       12/03/85
4,555,974                        06/726,920                       12/03/85
4,555,977                        06/527,303                       12/03/85
4,555,981                        06/639,909                       12/03/85
4,555,982                        06/577,718                       12/03/85
4,555,984                        06/495,490                       12/03/85
4,555,997                        06/615,013                       12/03/85
4,556,003                        06/639,515                       12/03/85
4,556,006                        06/507,782                       12/03/85
4,556,010                        06/438,873                       12/03/85
4,556,012                        06/617,127                       12/03/85
4,556,017                        06/697,125                       12/03/85
4,556,018                        06/675,860                       12/03/85
4,556,021                        06/590,019                       12/03/85
4,556,022                        06/705,324                       12/03/85
4,556,025                        06/671,946                       12/03/85
4,556,026                        06/712,915                       12/03/85
4,556,030                        06/573,763                       12/03/85
4,556,032                        06/568,393                       12/03/85
4,556,035                        06/609,185                       12/03/85
4,556,036                        06/626,622                       12/03/85
4,556,038                        06/564,161                       12/03/85
4,556,039                        06/522,763                       12/03/85
4,556,041                        06/510,375                       12/03/85
4,556,051                        06/439,357                       12/03/85
4,556,052                        06/611,404                       12/03/85
4,556,054                        06/554,063                       12/03/85
4,556,072                        06/550,095                       12/03/85
4,556,077                        06/563,423                       12/03/85
4,556,088                        06/564,691                       12/03/85
4,556,089                        06/617,168                       12/03/85
4,556,096                        06/690,889                       12/03/85
4,556,105                        06/544,824                       12/03/85
4,556,110                        06/645,722                       12/03/85
4,556,111                        06/645,731                       12/03/85
4,556,112                        06/558,937                       12/03/85
4,556,119                        06/668,680                       12/03/85
4,556,123                        06/628,025                       12/03/85
4,556,125                        06/584,317                       12/03/85
4,556,144                        06/627,410                       12/03/85
4,556,150                        06/610,183                       12/03/85
4,556,153                        06/623,456                       12/03/85
4,556,154                        06/551,386                       12/03/85
4,556,155                        06/542,304                       12/03/85
4,556,157                        06/381,063                       12/03/85
4,556,158                        06/709,333                       12/03/85
4,556,160                        06/589,664                       12/03/85
4,556,167                        06/713,038                       12/03/85
4,556,173                        06/542,643                       12/03/85
4,556,179                        06/559,539                       12/03/85
4,556,195                        06/648,075                       12/03/85
4,556,196                        06/563,961                       12/03/85
4,556,197                        06/604,682                       12/03/85
4,556,206                        06/438,563                       12/03/85
4,556,210                        06/563,730                       12/03/85
4,556,238                        06/645,422                       12/03/85
4,556,240                        06/403,114                       12/03/85
4,556,243                        06/584,253                       12/03/85
4,556,245                        06/664,372                       12/03/85
4,556,260                        06/516,279                       12/03/85
4,556,271                        06/542,106                       12/03/85
4,556,274                        06/564,041                       12/03/85
4,556,278                        06/582,107                       12/03/85
4,556,281                        06/562,929                       12/03/85
4,556,284                        06/577,294                       12/03/85
4,556,298                        06/630,823                       12/03/85
4,556,302                        06/524,900                       12/03/85
4,556,309                        06/454,480                       12/03/85
4,556,311                        06/520,188                       12/03/85
4,556,312                        06/624,666                       12/03/85
4,556,318                        06/501,840                       12/03/85
4,556,324                        06/605,806                       12/03/85
4,556,329                        06/446,032                       12/03/85
4,556,332                        06/508,493                       12/03/85
4,556,333                        06/722,423                       12/03/85
4,556,336                        06/616,041                       12/03/85
4,556,341                        06/701,816                       12/03/85
4,556,350                        06/376,172                       12/03/85
4,556,352                        06/461,652                       12/03/85
4,556,354                        06/722,474                       12/03/85
4,556,359                        06/633,731                       12/03/85
4,556,361                        06/574,472                       12/03/85
4,556,366                        06/542,868                       12/03/85
4,556,370                        06/548,987                       12/03/85
4,556,373                        06/647,073                       12/03/85
4,556,375                        06/655,617                       12/03/85
4,556,386                        06/541,270                       12/03/85
4,556,387                        06/611,342                       12/03/85
4,556,388                        06/471,675                       12/03/85
4,556,390                        06/624,472                       12/03/85
4,556,396                        06/640,752                       12/03/85
4,556,403                        06/575,340                       12/03/85
4,556,405                        06/657,230                       12/03/85
4,556,416                        06/605,489                       12/03/85
4,556,419                        06/663,056                       12/03/85
4,556,423                        06/454,362                       12/03/85
4,556,441                        06/460,582                       12/03/85
4,556,446                        06/648,254                       12/03/85
4,556,448                        06/543,642                       12/03/85
4,556,462                        06/632,856                       12/03/85
4,556,473                        06/699,836                       12/03/85
4,556,476                        06/639,896                       12/03/85
4,556,485                        06/636,475                       12/03/85
4,556,487                        06/596,942                       12/03/85
4,556,488                        06/608,904                       12/03/85
4,556,494                        06/712,312                       12/03/85
4,556,495                        06/508,637                       12/03/85
4,556,505                        06/363,785                       12/03/85
4,556,509                        06/659,197                       12/03/85
4,556,515                        06/584,357                       12/03/85
4,556,516                        06/577,755                       12/03/85
4,556,517                        06/432,099                       12/03/85
4,556,522                        06/608,586                       12/03/85
4,556,525                        06/608,098                       12/03/85
4,556,526                        06/245,849                       12/03/85
4,556,531                        06/486,525                       12/03/85
4,556,534                        06/563,556                       12/03/85
4,556,538                        06/361,423                       12/03/85
4,556,539                        06/477,353                       12/03/85
4,556,544                        06/611,472                       12/03/85
4,556,545                        06/647,503                       12/03/85
4,556,550                        06/543,360                       12/03/85
4,556,553                        06/499,447                       12/03/85
4,556,562                        06/590,808                       12/03/85
4,556,565                        06/548,734                       12/03/85
4,556,570                        06/593,451                       12/03/85
4,556,585                        06/695,716                       12/03/85
4,556,602                        06/613,745                       12/03/85
4,556,619                        06/432,865                       12/03/85
4,556,620                        06/691,896                       12/03/85
4,556,621                        06/625,970                       12/03/85
4,556,623                        06/688,119                       12/03/85
4,556,626                        06/525,908                       12/03/85
4,556,627                        06/600,084                       12/03/85
4,556,628                        06/600,063                       12/03/85
4,556,631                        06/409,807                       12/03/85
4,556,636                        06/502,815                       12/03/85
4,556,641                        06/437,692                       12/03/85
4,556,645                        06/625,373                       12/03/85
4,556,651                        06/529,635                       12/03/85
4,556,657                        06/487,132                       12/03/85
4,556,660                        06/487,774                       12/03/85
4,556,665                        06/628,875                       12/03/85
4,556,666                        06/541,084                       12/03/85
4,556,668                        06/514,120                       12/03/85
4,556,677                        06/436,805                       12/03/85
4,556,680                        06/527,900                       12/03/85
4,556,681                        06/688,371                       12/03/85
4,556,683                        06/524,396                       12/03/85
4,556,688                        06/691,028                       12/03/85
4,556,695                        06/624,282                       12/03/85
4,556,699                        06/677,166                       12/03/85
4,556,701                        06/595,068                       12/03/85
4,556,704                        06/661,789                       12/03/85
4,556,707                        06/576,056                       12/03/85
4,556,710                        06/476,663                       12/03/85
4,556,717                        06/505,019                       12/03/85
4,556,718                        06/668,854                       12/03/85
4,556,719                        06/603,536                       12/03/85
4,556,725                        06/694,307                       12/03/85
4,556,726                        06/689,991                       12/03/85
4,556,727                        06/632,140                       12/03/85
4,556,728                        06/675,501                       12/03/85
4,556,735                        06/706,312                       12/03/85
4,556,742                        06/614,218                       12/03/85
4,556,748                        06/546,790                       12/03/85
4,556,757                        06/514,767                       12/03/85
4,556,762                        06/552,802                       12/03/85
4,556,779                        06/472,171                       12/03/85
4,556,783                        06/551,604                       12/03/85
4,556,786                        06/620,842                       12/03/85
4,556,787                        06/475,292                       12/03/85
4,556,791                        06/502,052                       12/03/85
4,556,803                        06/600,398                       12/03/85
4,556,806                        06/673,823                       12/03/85
4,556,808                        06/384,379                       12/03/85
4,556,811                        06/665,082                       12/03/85
4,556,812                        06/632,165                       12/03/85
4,556,816                        06/510,910                       12/03/85
4,556,818                        06/454,354                       12/03/85
4,556,823                        06/518,229                       12/03/85
4,556,828                        06/548,176                       12/03/85
4,556,829                        06/617,629                       12/03/85
4,556,831                        06/629,869                       12/03/85
4,556,837                        06/475,858                       12/03/85
4,556,843                        06/475,952                       12/03/85
4,556,844                        06/547,884                       12/03/85
4,556,859                        06/417,239                       12/03/85
4,556,861                        06/453,990                       12/03/85
4,556,862                        06/495,031                       12/03/85
4,556,871                        06/505,979                       12/03/85
4,556,875                        06/444,331                       12/03/85
4,556,878                        06/493,578                       12/03/85
4,556,886                        06/348,674                       12/03/85
4,556,887                        06/398,216                       12/03/85
4,556,889                        06/537,845                       12/03/85
4,556,896                        06/412,928                       12/03/85
4,556,899                        06/386,071                       12/03/85
4,556,901                        06/459,157                       12/03/85
4,556,902                        06/572,150                       12/03/85
4,556,907                        06/601,534                       12/03/85
4,556,909                        06/647,169                       12/03/85
4,556,924                        06/439,147                       12/03/85
4,556,925                        06/402,419                       12/03/85
4,556,926                        06/536,205                       12/03/85
4,556,933                        06/644,507                       12/03/85
4,556,941                        06/483,795                       12/03/85
4,556,946                        06/402,972                       12/03/85
4,556,947                        06/410,294                       12/03/85
4,556,950                        06/528,942                       12/03/85
4,556,954                        06/652,440                       12/03/85
4,556,956                        06/533,644                       12/03/85
4,556,959                        06/480,009                       12/03/85
4,556,964                        06/332,500                       12/03/85
4,556,967                        06/565,994                       12/03/85
4,556,970                        06/705,394                       12/03/85
4,556,973                        06/550,153                       12/03/85
4,556,977                        06/532,639                       12/03/85
4,556,979                        06/439,757                       12/03/85
4,556,980                        06/463,501                       12/03/85
4,556,985                        06/504,263                       12/03/85
4,556,987                        06/523,525                       12/03/85
4,556,989                        06/547,710                       12/03/85
4,882,790                        07/085,135                       11/28/89
4,882,792                        07/179,875                       11/28/89
4,882,795                        07/297,284                       11/28/89
4,882,796                        07/340,508                       11/28/89
4,882,800                        07/237,530                       11/28/89
4,882,801                        07/180,439                       11/28/89
4,882,809                        07/281,091                       11/28/89
4,882,810                        07/280,105                       11/28/89
4,882,812                        07/191,688                       11/28/89
4,882,815                        07/201,139                       11/28/89
4,882,816                        07/277,975                       11/28/89
4,882,820                        07/326,523                       11/28/89
4,882,828                        07/349,888                       11/28/89
4,882,829                        07/320,977                       11/28/89
4,882,830                        07/305,558                       11/28/89
4,882,840                        07/226,564                       11/28/89
4,882,843                        07/203,478                       11/28/89
4,882,847                        07/305,598                       11/28/89
4,882,857                        07/078,986                       11/28/89
4,882,865                        07/146,390                       11/28/89
4,882,866                        06/941,595                       11/28/89
4,882,868                        07/326,792                       11/28/89
4,882,871                        07/312,974                       11/28/89
4,882,873                        07/033,271                       11/28/89
4,882,874                        07/225,499                       11/28/89
4,882,889                        07/161,025                       11/28/89
4,882,890                        07/199,988                       11/28/89
4,882,892                        07/342,108                       11/28/89
4,882,897                        07/274,116                       11/28/89
4,882,898                        07/335,912                       11/28/89
4,882,903                        07/176,782                       11/28/89
4,882,909                        07/247,605                       11/28/89
4,882,910                        07/308,142                       11/28/89
4,882,916                        07/317,969                       11/28/89
4,882,918                        07/133,553                       11/28/89
4,882,920                        07/341,157                       11/28/89
4,882,924                        07/099,794                       11/28/89
4,882,926                        07/263,396                       11/28/89
4,882,928                        07/255,880                       11/28/89
4,882,931                        07/253,495                       11/28/89
4,882,934                        07/157,413                       11/28/89
4,882,938                        07/178,200                       11/28/89
4,882,944                        07/216,139                       11/28/89
4,882,947                        07/307,203                       11/28/89
4,882,961                        07/115,430                       11/28/89
4,882,970                        07/295,085                       11/28/89
4,882,973                        07/200,835                       11/28/89
4,882,981                        07/192,914                       11/28/89
4,882,993                        07/229,514                       11/28/89
4,882,995                        07/300,321                       11/28/89
4,882,997                        07/126,010                       11/28/89
4,883,001                        07/135,008                       11/28/89
4,883,005                        07/313,099                       11/28/89
4,883,012                        07/253,192                       11/28/89
4,883,013                        07/345,339                       11/28/89
4,883,018                        07/263,941                       11/28/89
4,883,020                        07/320,922                       11/28/89
4,883,034                        07/226,024                       11/28/89
4,883,042                        07/166,392                       11/28/89
4,883,044                        07/263,866                       11/28/89
4,883,051                        07/158,949                       11/28/89
4,883,056                        07/117,235                       11/28/89
4,883,062                        07/186,086                       11/28/89
4,883,063                        07/338,374                       11/28/89
4,883,064                        07/122,796                       11/28/89
4,883,072                        07/309,404                       11/28/89
4,883,080                        07/228,494                       11/28/89
4,883,084                        07/221,855                       11/28/89
4,883,092                        07/241,957                       11/28/89
4,883,099                        06/888,655                       11/28/89
4,883,109                        07/197,705                       11/28/89
4,883,111                        07/258,402                       11/28/89
4,883,113                        07/280,139                       11/28/89
4,883,114                        07/301,605                       11/28/89
4,883,115                        07/245,914                       11/28/89
4,883,118                        07/272,401                       11/28/89
4,883,130                        07/238,487                       11/28/89
4,883,131                        07/197,495                       11/28/89
4,883,134                        07/101,173                       11/28/89
4,883,135                        07/235,936                       11/28/89
4,883,136                        07/144,958                       11/28/89
4,883,141                        07/185,122                       11/28/89
4,883,147                        07/211,921                       11/28/89
4,883,149                        07/225,185                       11/28/89
4,883,160                        07/328,935                       11/28/89
4,883,164                        07/203,883                       11/28/89
4,883,166                        06/774,013                       11/28/89
4,883,171                        07/260,499                       11/28/89
4,883,175                        07/155,564                       11/28/89
4,883,178                        07/279,401                       11/28/89
4,883,182                        07/142,976                       11/28/89
4,883,198                        07/106,716                       11/28/89
4,883,202                        07/146,197                       11/28/89
4,883,205                        07/309,710                       11/28/89
4,883,221                        07/344,918                       11/28/89
4,883,224                        07/197,134                       11/28/89
4,883,227                        07/158,329                       11/28/89
4,883,230                        07/203,112                       11/28/89
4,883,241                        07/241,705                       11/28/89
4,883,247                        07/211,863                       11/28/89
4,883,251                        07/273,182                       11/28/89
4,883,256                        07/299,674                       11/28/89
4,883,262                        07/126,110                       11/28/89
4,883,269                        07/192,250                       11/28/89
4,883,271                        07/182,913                       11/28/89
4,883,275                        07/167,209                       11/28/89
4,883,278                        07/230,518                       11/28/89
4,883,281                        07/338,542                       11/28/89
4,883,285                        07/289,814                       11/28/89
4,883,288                        07/260,338                       11/28/89
4,883,289                        07/253,466                       11/28/89
4,883,293                        07/249,730                       11/28/89
4,883,294                        07/194,333                       11/28/89
4,883,297                        07/251,316                       11/28/89
4,883,299                        07/178,540                       11/28/89
4,883,300                        07/257,324                       11/28/89
4,883,302                        07/168,240                       11/28/89
4,883,303                        07/062,835                       11/28/89
4,883,304                        07/200,760                       11/28/89
4,883,305                        07/306,040                       11/28/89
4,883,311                        07/276,660                       11/28/89
4,883,313                        07/232,699                       11/28/89
4,883,315                        07/207,736                       11/28/89
4,883,319                        07/285,653                       11/28/89
4,883,327                        07/299,402                       11/28/89
4,883,329                        07/257,711                       11/28/89
4,883,336                        07/311,865                       11/28/89
4,883,337                        07/237,779                       11/28/89
4,883,342                        07/279,458                       11/28/89
4,883,346                        07/227,803                       11/28/89
4,883,376                        07/139,634                       11/28/89
4,883,381                        07/241,706                       11/28/89
4,883,385                        07/341,262                       11/28/89
4,883,386                        07/192,581                       11/28/89
4,883,389                        07/124,792                       11/28/89
4,883,392                        07/193,875                       11/28/89
4,883,394                        07/258,751                       11/28/89
4,883,396                        07/232,698                       11/28/89
4,883,398                        07/060,327                       11/28/89
4,883,405                        07/122,142                       11/28/89
4,883,407                        07/285,583                       11/28/89
4,883,410                        07/297,365                       11/28/89
4,883,411                        07/239,618                       11/28/89
4,883,414                        07/171,653                       11/28/89
4,883,418                        07/252,124                       11/28/89
4,883,419                        07/263,984                       11/28/89
4,883,421                        07/181,709                       11/28/89
4,883,422                        07/333,614                       11/28/89
4,883,425                        07/236,773                       11/28/89
4,883,439                        07/129,142                       11/28/89
4,883,442                        07/005,208                       11/28/89
4,883,444                        07/191,587                       11/28/89
4,883,447                        07/136,202                       11/28/89
4,883,451                        07/267,315                       11/28/89
4,883,459                        07/139,065                       11/28/89
4,883,461                        07/269,829                       11/28/89
4,883,468                        07/176,601                       11/28/89
4,883,471                        07/232,775                       11/28/89
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