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 28, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,775                  06/912,093                   11/01/88
(4,567,491)                (06/633,171)                (01/28/86)
4,566,140                   06/616,313                   01/28/86
4,566,143                   06/679,731                   01/28/86
4,566,144                   06/502,433                   01/28/86
4,566,146                   06/605,052                   01/28/86
4,566,151                   06/532,310                   01/28/86
4,566,152                   06/484,421                   01/28/86
4,566,153                   06/650,321                   01/28/86
4,566,156                   06/517,898                   01/28/86
4,566,172                   06/583,512                   01/28/86
4,566,173                   06/384,855                   01/28/86
4,566,175                   06/412,753                   01/28/86
4,566,176                   06/612,987                   01/28/86
4,566,177                   06/609,268                   01/28/86
4,566,194                   06/709,160                   01/28/86
4,566,195                   06/692,122                   01/28/86
4,566,212                   06/544,683                   01/28/86
4,566,215                   06/598,328                   01/28/86
4,566,220                   06/645,415                   01/28/86
4,566,224                   06/664,219                   01/28/86
4,566,226                   06/662,675                   01/28/86
4,566,229                   06/629,991                   01/28/86
4,566,232                   06/563,778                   01/28/86
4,566,245                   06/505,257                   01/28/86
4,566,252                   06/589,334                   01/28/86
4,566,267                   06/614,330                   01/28/86
4,566,273                   06/474,285                   01/28/86
4,566,280                   06/610,346                   01/28/86
4,566,282                   06/591,410                   01/28/86
4,566,285                   06/574,135                   01/28/86
4,566,293                   06/677,252                   01/28/86
4,566,298                   06/605,177                   01/28/86
4,566,306                   06/587,535                   01/28/86
4,566,308                   06/667,988                   01/28/86
4,566,309                   06/511,056                   01/28/86
4,566,311                   06/649,120                   01/28/86
4,566,312                   06/606,352                   01/28/86
4,566,317                   06/575,117                   01/28/86
4,566,330                   06/657,028                   01/28/86
4,566,335                   06/641,154                   01/28/86
4,566,347                   06/631,860                   01/28/86
4,566,363                   06/583,121                   01/28/86
4,566,366                   06/648,307                   01/28/86
4,566,367                   06/559,275                   01/28/86
4,566,371                   06/444,955                   01/28/86
4,566,378                   06/730,249                   01/28/86
4,566,381                   06/612,243                   01/28/86
4,566,389                   06/678,763                   01/28/86
4,566,391                   06/576,756                   01/28/86
4,566,395                   06/667,990                   01/28/86
4,566,396                   06/655,345                   01/28/86
4,566,398                   06/637,197                   01/28/86
4,566,407                   06/661,568                   01/28/86
4,566,412                   06/555,534                   01/28/86
4,566,422                   06/672,857                   01/28/86
4,566,424                   06/635,568                   01/28/86
4,566,427                   06/561,020                   01/28/86
4,566,431                   06/622,251                   01/28/86
4,566,435                   06/434,499                   01/28/86
4,566,440                   06/578,731                   01/28/86
4,566,445                   06/518,352                   01/28/86
4,566,457                   06/757,775                   01/28/86
4,566,462                   06/553,951                   01/28/86
4,566,465                   06/597,535                   01/28/86
4,566,466                   06/600,970                   01/28/86
4,566,480                   06/648,238                   01/28/86
4,566,498                   06/652,418                   01/28/86
4,566,506                   06/667,223                   01/28/86
4,566,507                   06/578,494                   01/28/86
4,566,511                   06/609,497                   01/28/86
4,566,520                   06/621,204                   01/28/86
4,566,530                   06/493,568                   01/28/86
4,566,536                   06/665,869                   01/28/86
4,566,548                   06/644,344                   01/28/86
4,566,551                   06/527,766                   01/28/86
4,566,557                   06/588,008                   01/28/86
4,566,559                   06/645,401                   01/28/86
4,566,560                   06/601,119                   01/28/86
4,566,564                   06/638,793                   01/28/86
4,566,568                   07/508,796                   01/28/86
4,566,572                   06/569,362                   01/28/86
4,566,574                   06/577,244                   01/28/86
4,566,575                   06/336,103                   01/28/86
4,566,576                   06/435,691                   01/28/86
4,566,581                   06/532,380                   01/28/86
4,566,585                   06/500,364                   01/28/86
4,566,586                   06/524,057                   01/28/86
4,566,593                   06/693,713                   01/28/86
4,566,594                   06/689,507                   01/28/86
4,566,600                   06/710,825                   01/28/86
4,566,601                   06/640,341                   01/28/86
4,566,603                   06/630,002                   01/28/86
4,566,605                   06/754,164                   01/28/86
4,566,608                   06/635,664                   01/28/86
4,566,610                   06/532,578                   01/28/86
4,566,611                   06/511,105                   01/28/86
4,566,619                   06/664,944                   01/28/86
4,566,621                   06/627,411                   01/28/86
4,566,626                   06/716,163                   01/28/86
4,566,629                   06/534,623                   01/28/86
4,566,642                   06/679,489                   01/28/86
4,566,643                   06/606,180                   01/28/86
4,566,652                   06/553,481                   01/28/86
4,566,653                   06/543,061                   01/28/86
4,566,673                   06/651,444                   01/28/86
4,566,677                   06/502,236                   01/28/86
4,566,682                   06/657,395                   01/28/86
4,566,683                   06/526,924                   01/28/86
4,566,684                   06/570,164                   01/28/86
4,566,685                   06/577,000                   01/28/86
4,566,689                   06/679,862                   01/28/86
4,566,691                   06/550,298                   01/28/86
4,566,692                   06/495,806                   01/28/86
4,566,710                   06/659,322                   01/28/86
4,566,711                   06/661,680                   01/28/86
4,566,714                   06/529,073                   01/28/86
4,566,720                   06/574,459                   01/28/86
4,566,735                   06/551,913                   01/28/86
4,566,736                   06/608,682                   01/28/86
4,566,742                   06/568,640                   01/28/86
4,566,750                   06/479,455                   01/28/86
4,566,755                   06/657,479                   01/28/86
4,566,756                   06/565,564                   01/28/86
4,566,757                   06/548,892                   01/28/86
4,566,758                   06/493,107                   01/28/86
4,566,761                   06/650,012                   01/28/86
4,566,762                   06/527,388                   01/28/86
4,566,778                   06/485,510                   01/28/86
4,566,780                   06/577,916                   01/28/86
4,566,784                   06/663,992                   01/28/86
4,566,787                   06/572,162                   01/28/86
4,566,792                   06/463,961                   01/28/86
4,566,813                   06/654,496                   01/28/86
4,566,815                   06/553,181                   01/28/86
4,566,816                   06/527,412                   01/28/86
4,566,820                   06/563,511                   01/28/86
4,566,834                   06/578,764                   01/28/86
4,566,835                   06/536,934                   01/28/86
4,566,837                   06/660,542                   01/28/86
4,566,839                   06/544,588                   01/28/86
4,566,848                   06/636,257                   01/28/86
4,566,856                   06/655,385                   01/28/86
4,566,858                   06/619,738                   01/28/86
4,566,862                   06/632,267                   01/28/86
4,566,863                   06/651,612                   01/28/86
4,566,866                   06/609,561                   01/28/86
4,566,867                   06/626,915                   01/28/86
4,566,880                   06/424,638                   01/28/86
4,566,881                   06/695,394                   01/28/86
4,566,883                   06/586,482                   01/28/86
4,566,885                   06/657,856                   01/28/86
4,566,892                   06/660,187                   01/28/86
4,566,894                   06/736,514                   01/28/86
4,566,895                   06/745,381                   01/28/86
4,566,901                   06/490,055                   01/28/86
4,566,902                   06/605,282                   01/28/86
4,566,903                   06/657,122                   01/28/86
4,566,907                   06/579,880                   01/28/86
4,566,919                   06/597,415                   01/28/86
4,566,920                   06/585,554                   01/28/86
4,566,924                   06/652,070                   01/28/86
4,566,934                   06/437,472                   01/28/86
4,566,938                   06/581,121                   01/28/86
4,566,939                   06/694,863                   01/28/86
4,566,947                   06/684,712                   01/28/86
4,566,949                   06/659,792                   01/28/86
4,566,952                   06/595,538                   01/28/86
4,566,954                   06/448,074                   01/28/86
4,566,959                   06/689,001                   01/28/86
4,566,960                   06/689,003                   01/28/86
4,566,962                   06/565,071                   01/28/86
4,566,965                   06/630,892                   01/28/86
4,566,968                   06/671,801                   01/28/86
4,566,977                   06/706,725                   01/28/86
4,566,987                   06/504,906                   01/28/86
4,566,989                   06/352,731                   01/28/86
4,566,994                   06/501,294                   01/28/86
4,566,999                   06/589,883                   01/28/86
4,567,002                   06/603,855                   01/28/86
4,567,005                   06/487,481                   01/28/86
4,567,021                   06/434,877                   01/28/86
4,567,028                   06/700,663                   01/28/86
4,567,031                   06/565,964                   01/28/86
4,567,033                   06/664,825                   01/28/86
4,567,044                   06/670,943                   01/28/86
4,567,055                   06/587,339                   01/28/86
4,567,064                   06/581,089                   01/28/86
4,567,072                   06/652,931                   01/28/86
4,567,090                   06/721,793                   01/28/86
4,567,091                   06/749,387                   01/28/86
4,567,095                   06/734,009                   01/28/86
4,567,096                   06/714,331                   01/28/86
4,567,099                   06/684,876                   01/28/86
4,567,103                   06/628,516                   01/28/86
4,567,108                   06/672,635                   01/28/86
4,567,110                   06/284,583                   01/28/86
4,567,112                   06/597,034                   01/28/86
4,567,114                   06/484,169                   01/28/86
4,567,120                   06/656,893                   01/28/86
4,567,129                   06/635,347                   01/28/86
4,567,130                   06/635,348                   01/28/86
4,567,133                   06/622,951                   01/28/86
4,567,143                   06/690,271                   01/28/86
4,567,152                   06/681,450                   01/28/86
4,567,154                   06/508,435                   01/28/86
4,567,155                   06/653,211                   01/28/86
4,567,157                   06/379,229                   01/28/86
4,567,160                   06/510,882                   01/28/86
4,567,165                   06/608,213                   01/28/86
4,567,178                   06/689,325                   01/28/86
4,567,179                   06/659,733                   01/28/86
4,567,181                   06/596,932                   01/28/86
4,567,183                   06/560,460                   01/28/86
4,567,184                   06/530,811                   01/28/86
4,567,185                   06/537,182                   01/28/86
4,567,186                   06/697,802                   01/28/86
4,567,189                   06/606,808                   01/28/86
4,567,197                   06/492,247                   01/28/86
4,567,198                   06/577,032                   01/28/86
4,567,200                   06/358,502                   01/28/86
4,567,210                   06/697,996                   01/28/86
4,567,218                   06/706,384                   01/28/86
4,567,235                   06/666,672                   01/28/86
4,567,237                   06/673,870                   01/28/86
4,567,238                   06/666,673                   01/28/86
4,567,239                   06/620,974                   01/28/86
4,567,242                   06/480,477                   01/28/86
4,567,245                   06/681,861                   01/28/86
4,567,250                   06/631,947                   01/28/86
4,567,251                   06/578,167                   01/28/86
4,567,256                   06/658,236                   01/28/86
4,567,261                   06/570,457                   01/28/86
4,567,263                   06/651,660                   01/28/86
4,567,266                   06/636,959                   01/28/86
4,567,270                   06/652,110                   01/28/86
4,567,278                   06/593,312                   01/28/86
4,567,281                   06/501,741                   01/28/86
4,567,284                   06/682,117                   01/28/86
4,567,287                   06/638,800                   01/28/86
4,567,291                   06/560,353                   01/28/86
4,567,310                   06/701,313                   01/28/86
4,567,315                   06/609,121                   01/28/86
4,567,324                   06/540,465                   01/28/86
4,567,327                   06/462,274                   01/28/86
4,567,328                   06/613,341                   01/28/86
4,567,349                   06/441,583                   01/28/86
4,567,350                   06/456,327                   01/28/86
4,567,356                   06/539,420                   01/28/86
4,567,357                   06/492,401                   01/28/86
4,567,359                   06/613,525                   01/28/86
4,567,361                   06/496,819                   01/28/86
4,567,366                   06/536,051                   01/28/86
4,567,372                   06/559,563                   01/28/86
4,567,373                   06/435,430                   01/28/86
4,567,379                   06/613,315                   01/28/86
4,567,382                   06/598,682                   01/28/86
4,567,388                   06/538,241                   01/28/86
4,567,391                   06/603,206                   01/28/86
4,567,392                   06/677,712                   01/28/86
4,567,393                   06/618,971                   01/28/86
4,567,395                   06/665,426                   01/28/86
4,567,397                   06/497,986                   01/28/86
4,567,403                   06/349,969                   01/28/86
4,567,405                   06/555,785                   01/28/86
4,567,408                   06/687,025                   01/28/86
4,567,410                   06/677,411                   01/28/86
4,567,411                   06/715,130                   01/28/86
4,567,415                   06/599,177                   01/28/86
4,567,422                   06/754,426                   01/28/86
4,567,424                   06/576,275                   01/28/86
4,567,426                   06/595,062                   01/28/86
4,567,428                   06/675,050                   01/28/86
4,567,435                   06/583,021                   01/28/86
4,567,437                   06/502,938                   01/28/86
4,567,438                   06/482,093                   01/28/86
4,567,443                   06/708,171                   01/28/86
4,567,453                   06/532,877                   01/28/86
4,567,460                   06/451,274                   01/28/86
4,567,461                   06/468,121                   01/28/86
4,567,463                   06/351,542                   01/28/86
4,567,464                   06/461,842                   01/28/86
4,567,470                   06/488,399                   01/28/86
4,567,476                   06/567,098                   01/28/86
4,567,478                   06/469,754                   01/28/86
4,567,485                   06/725,528                   01/28/86
4,567,490                   06/567,300                   01/28/86
4,567,506                   06/598,790                   01/28/86
4,567,516                   06/412,780                   01/28/86
4,567,518                   06/749,682                   01/28/86
4,567,520                   06/578,915                   01/28/86
4,567,523                   06/558,226                   01/28/86
4,567,529                   06/617,566                   01/28/86
4,567,532                   06/532,874                   01/28/86
4,567,534                   06/559,064                   01/28/86
4,567,538                   06/571,528                   01/28/86
4,567,555                   06/631,809                   01/28/86
4,567,560                   06/530,808                   01/28/86
4,567,565                   06/317,980                   01/28/86
4,567,572                   06/468,423                   01/28/86
4,567,576                   06/579,996                   01/28/86
4,567,577                   06/439,161                   01/28/86
4,567,579                   06/512,076                   01/28/86
4,567,585                   06/547,329                   01/28/86
4,567,586                   06/327,508                   01/28/86
4,567,590                   06/565,789                   01/28/86
4,567,591                   06/519,268                   01/28/86
4,567,594                   06/502,046                   01/28/86
4,567,603                   06/502,778                   01/28/86
4,567,608                   06/592,411                   01/28/86
4,894,865                   07/343,427                   01/23/90
4,894,879                   06/848,797                   01/23/90
4,894,880                   07/305,718                   01/23/90
4,894,884                   07/324,204                   01/23/90
4,894,887                   07/136,112                   01/23/90
4,894,890                   07/253,552                   01/23/90
4,894,892                   07/229,014                   01/23/90
4,894,899                   07/188,348                   01/23/90
4,894,908                   07/251,341                   01/23/90
4,894,912                   07/147,849                   01/23/90
4,894,914                   07/209,272                   01/23/90
4,894,923                   07/054,552                   01/23/90
4,894,926                   07/317,814                   01/23/90
4,894,928                   07/176,051                   01/23/90
4,894,931                   07/298,232                   01/23/90
4,894,933                   07/216,498                   01/23/90
4,894,936                   07/236,301                   01/23/90
4,894,940                   07/317,556                   01/23/90
4,894,944                   07/247,406                   01/23/90
4,894,945                   07/244,445                   01/23/90
4,894,949                   07/216,958                   01/23/90
4,894,955                   07/209,368                   01/23/90
4,894,960                   07/176,197                   01/23/90
4,894,963                   07/180,143                   01/23/90
4,894,964                   07/302,571                   01/23/90
4,894,970                   07/212,329                   01/23/90
4,894,977                   07/050,881                   01/23/90
4,894,990                   07/251,818                   01/23/90
4,894,993                   07/128,824                   01/23/90
4,895,010                   07/172,249                   01/23/90
4,895,012                   07/238,651                   01/23/90
4,895,014                   07/201,541                   01/23/90
4,895,022                   07/235,888                   01/23/90
4,895,032                   07/243,954                   01/23/90
4,895,033                   07/303,135                   01/23/90
4,895,042                   07/245,442                   01/23/90
4,895,044                   07/313,709                   01/23/90
4,895,047                   07/177,069                   01/23/90
4,895,054                   07/289,822                   01/23/90
4,895,057                   07/109,934                   01/23/90
4,895,058                   07/253,700                   01/23/90
4,895,064                   07/123,154                   01/23/90
4,895,068                   07/362,285                   01/23/90
4,895,081                   07/348,845                   01/23/90
4,895,082                   07/261,514                   01/23/90
4,895,084                   07/134,830                   01/23/90
4,895,085                   07/142,726                   01/23/90
4,895,087                   07/201,089                   01/23/90
4,895,090                   07/308,572                   01/23/90
4,895,091                   07/259,357                   01/23/90
4,895,092                   07/285,213                   01/23/90
4,895,098                   07/273,564                   01/23/90
4,895,103                   07/235,006                   01/23/90
4,895,104                   07/214,671                   01/23/90
4,895,106                   07/293,193                   01/23/90
4,895,110                   07/209,995                   01/23/90
4,895,111                   07/230,671                   01/23/90
4,895,112                   07/151,191                   01/23/90
4,895,122                   07/228,009                   01/23/90
4,895,124                   07/127,378                   01/23/90
4,895,131                   07/311,357                   01/23/90
4,895,133                   06/914,699                   01/23/90
4,895,134                   07/345,484                   01/23/90
4,895,138                   07/240,007                   01/23/90
4,895,140                   07/229,630                   01/23/90
4,895,142                   07/214,034                   01/23/90
4,895,143                   07/135,987                   01/23/90
4,895,149                   06/644,683                   01/23/90
4,895,150                   07/172,654                   01/23/90
4,895,155                   07/262,047                   01/23/90
4,895,162                   07/244,927                   01/23/90
4,895,163                   07/197,995                   01/23/90
4,895,173                   07/050,573                   01/23/90
4,895,176                   07/294,644                   01/23/90
4,895,179                   07/191,249                   01/23/90
4,895,183                   07/268,407                   01/23/90
4,895,187                   07/259,368                   01/23/90
4,895,188                   07/352,054                   01/23/90
4,895,189                   07/258,093                   01/23/90
4,895,190                   07/373,632                   01/23/90
4,895,205                   07/110,371                   01/23/90
4,895,217                   07/136,047                   01/23/90
4,895,222                   07/300,792                   01/23/90
4,895,226                   06/766,590                   01/23/90
4,895,230                   07/247,800                   01/23/90
4,895,238                   07/173,580                   01/23/90
4,895,239                   07/328,924                   01/23/90
4,895,240                   07/324,079                   01/23/90
4,895,253                   07/350,092                   01/23/90
4,895,254                   06/877,771                   01/23/90
4,895,257                   07/299,628                   01/23/90
4,895,258                   07/216,793                   01/23/90
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