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 NOVEMBER 21, 1989
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number                   Serial Number                   Issue Date

Re 32,644                       06/914,769                      4/12/88
(4,553,732)                    (06/579,571)                    (11/19/85)
Re 32,934                       07/063,683                      5/30/89
(4,553,739)                    (06/600,147)                    (11/19/85)
Re 33,133                       07/123,592                      12/19/89
(4,554,228)                    (06/597,668)                    (11/19/85)
4,302,365                       06/120,290                      11/24/81
4,302,442                       06/217,623                      11/24/81
4,553,269                       06/635,083                      11/19/85
4,553,271                       06/397,533                      11/19/85
4,553,272                       06/238,374                      11/19/85
4,553,275                       06/606,889                      11/19/85
4,553,282                       06/691,744                      11/19/85
4,553,283                       06/705,772                      11/19/85
4,553,284                       06/588,911                      11/19/85
4,553,287                       06/506,904                      11/19/85
4,553,289                       06/553,248                      11/19/85
4,553,293                       06/538,949                      11/19/85
4,553,295                       06/602,433                      11/19/85
4,553,296                       06/502,873                      11/19/85
4,553,297                       06/594,798                      11/19/85
4,553,307                       06/571,561                      11/19/85
4,553,311                       06/564,266                      11/19/85
4,553,313                       06/452,539                      11/19/85
4,553,320                       06/546,349                      11/19/85
4,553,328                       06/533,634                      11/19/85
4,553,331                       06/484,932                      11/19/85
4,553,334                       06/576,680                      11/19/85
4,553,335                       06/630,982                      11/19/85
4,553,338                       06/648,576                      11/19/85
4,553,340                       06/611,143                      11/19/85
4,553,343                       06/626,717                      11/19/85
4,553,344                       06/598,049                      11/19/85
4,553,346                       06/510,633                      11/19/85
4,553,348                       06/585,507                      11/19/85
4,553,352                       06/579,032                      11/19/85
4,553,358                       06/648,039                      11/19/85
4,553,359                       06/534,482                      11/19/85
4,553,366                       06/468,632                      11/19/85
4,553,370                       06/521,804                      11/19/85
4,553,371                       06/580,548                      11/19/85
4,553,372                       06/541,234                      11/19/85
4,553,373                       06/418,126                      11/19/85
4,553,381                       06/511,031                      11/19/85
4,553,386                       06/601,305                      11/19/85
4,553,389                       06/404,697                      11/19/85
4,553,390                       06/662,700                      11/19/85
4,553,391                       06/551,901                      11/19/85
4,553,393                       06/527,613                      11/19/85
4,553,398                       06/576,865                      11/19/85
4,553,402                       06/486,783                      11/19/85
4,553,403                       06/612,490                      11/19/85
4,553,404                       06/622,868                      11/19/85
4,553,406                       06/520,158                      11/19/85
4,553,409                       06/630,208                      11/19/85
4,553,412                       06/577,816                      11/19/85
4,553,414                       06/617,015                      11/19/85
4,553,421                       06/605,057                      11/19/85
4,553,425                       06/576,229                      11/19/85
4,553,427                       06/587,011                      11/19/85
4,553,429                       06/578,721                      11/19/85
4,553,435                       06/515,240                      11/19/85
4,553,439                       06/510,535                      11/19/85
4,553,443                       06/443,069                      11/19/85
4,553,444                       06/542,746                      11/19/85
4,553,445                       06/585,452                      11/19/85
4,553,447                       06/556,389                      11/19/85
4,553,449                       06/536,326                      11/19/85
4,553,450                       06/468,636                      11/19/85
4,553,451                       06/578,931                      11/19/85
4,553,456                       06/637,734                      11/19/85
4,553,457                       06/505,166                      11/19/85
4,553,460                       06/540,689                      11/19/85
4,553,461                       06/433,651                      11/19/85
4,553,463                       06/511,872                      11/19/85
4,553,472                       06/525,462                      11/19/85
4,553,475                       06/487,162                      11/19/85
4,553,477                       06/680,009                      11/19/85
4,553,482                       06/611,928                      11/19/85
4,553,489                       06/656,448                      11/19/85
4,553,495                       06/531,814                      11/19/85
4,553,496                       06/568,786                      11/19/85
4,553,497                       06/441,751                      11/19/85
4,553,498                       06/598,561                      11/19/85
4,553,499                       06/604,187                      11/19/85
4,553,500                       06/633,673                      11/19/85
4,553,502                       06/697,678                      11/19/85
4,553,505                       06/624,369                      11/19/85
4,553,506                       06/503,192                      11/19/85
4,553,513                       06/536,531                      11/19/85
4,553,516                       06/582,318                      11/19/85
4,553,520                       06/650,006                      11/19/85
4,553,521                       06/558,605                      11/19/85
4,553,522                       06/538,214                      11/19/85
4,553,525                       06/603,182                      11/19/85
4,553,527                       06/580,663                      11/19/85
4,553,536                       06/469,448                      11/19/85
4,553,538                       06/559,422                      11/19/85
4,553,540                       06/523,707                      11/19/85
4,553,543                       06/586,473                      11/19/85
4,553,548                       06/524,851                      11/19/85
4,553,549                       06/659,094                      11/19/85
4,553,550                       06/256,565                      11/19/85
4,553,551                       06/466,919                      11/19/85
4,553,552                       06/581,996                      11/19/85
4,553,553                       06/472,455                      11/19/85
4,553,555                       06/578,778                      11/19/85
4,553,566                       06/597,802                      11/19/85
4,553,567                       06/709,823                      11/19/85
4,553,570                       06/527,848                      11/19/85
4,553,574                       06/534,811                      11/19/85
4,553,580                       06/504,131                      11/19/85
4,553,583                       06/610,919                      11/19/85
4,553,586                       06/504,493                      11/19/85
4,553,587                       06/523,371                      11/19/85
4,553,588                       06/714,135                      11/19/85
4,553,591                       06/599,581                      11/19/85
4,553,594                       06/483,149                      11/19/85
4,553,595                       06/616,090                      11/19/85
4,553,600                       06/572,047                      11/19/85
4,553,603                       06/685,956                      11/19/85
4,553,607                       06/542,534                      11/19/85
4,553,608                       06/580,678                      11/19/85
4,553,615                       06/467,672                      11/19/85
4,553,617                       06/510,097                      11/19/85
4,553,626                       06/530,831                      11/19/85
4,553,630                       06/692,349                      11/19/85
4,553,631                       06/496,066                      11/19/85
4,553,632                       06/597,500                      11/19/85
4,553,634                       06/705,784                      11/19/85
4,553,638                       06/630,746                      11/19/85
4,553,640                       06/413,820                      11/19/85
4,553,643                       06/549,796                      11/19/85
4,553,649                       06/557,563                      11/19/85
4,553,652                       06/525,386                      11/19/85
4,553,653                       06/372,340                      11/19/85
4,553,659                       06/377,369                      11/19/85
4,553,661                       06/552,739                      11/19/85
4,553,663                       06/609,041                      11/19/85
4,553,666                       06/697,606                      11/19/85
4,553,670                       06/558,964                      11/19/85
4,553,672                       06/611,154                      11/19/85
4,553,676                       06/573,471                      11/19/85
4,553,680                       06/643,474                      11/19/85
4,553,681                       06/231,324                      11/19/85
4,553,685                       06/684,742                      11/19/85
4,553,689                       06/437,346                      11/19/85
4,553,692                       06/619,350                      11/19/85
4,553,693                       06/618,116                      11/19/85
4,553,697                       06/583,403                      11/19/85
4,553,700                       06/590,769                      11/19/85
4,553,702                       06/463,938                      11/19/85
4,553,703                       06/582,814                      11/19/85
4,553,704                       06/581,109                      11/19/85
4,553,706                       06/623,900                      11/19/85
4,553,709                       06/541,289                      11/19/85
4,553,710                       06/523,434                      11/19/85
4,553,712                       06/328,672                      11/19/85
4,553,715                       06/646,701                      11/19/85
4,553,718                       06/430,346                      11/19/85
4,553,725                       06/523,070                      11/19/85
4,553,726                       06/533,474                      11/19/85
4,553,728                       06/613,336                      11/19/85
4,553,729                       06/568,937                      11/19/85
4,553,731                       06/648,101                      11/19/85
4,553,741                       06/657,678                      11/19/85
4,553,746                       06/524,565                      11/19/85
4,553,751                       06/667,800                      11/19/85
4,553,754                       06/348,825                      11/19/85
4,553,757                       06/573,792                      11/19/85
4,553,768                       06/553,704                      11/19/85
4,553,769                       06/624,932                      11/19/85
4,553,772                       06/476,202                      11/19/85
4,553,780                       06/621,422                      11/19/85
4,553,783                       06/473,614                      11/19/85
4,553,788                       06/626,301                      11/19/85
4,553,797                       06/341,284                      11/19/85
4,553,799                       06/512,905                      11/19/85
4,553,809                       06/654,602                      11/19/85
4,553,815                       06/464,433                      11/19/85
4,553,817                       06/481,933                      11/19/85
4,553,822                       06/400,955                      11/19/85
4,553,824                       06/604,929                      11/19/85
4,553,826                       06/516,947                      11/19/85
4,553,829                       06/544,298                      11/19/85
4,553,835                       06/626,134                      11/19/85
4,553,836                       06/412,496                      11/19/85
4,553,837                       06/544,956                      11/19/85
4,553,840                       06/442,113                      11/19/85
4,553,842                       06/492,859                      11/19/85
4,553,846                       06/500,241                      11/19/85
4,553,851                       06/558,870                      11/19/85
4,553,862                       06/588,467                      11/19/85
4,553,863                       06/666,736                      11/19/85
4,553,872                       06/580,416                      11/19/85
4,553,878                       06/471,490                      11/19/85
4,553,885                       06/380,120                      11/19/85
4,553,886                       06/641,195                      11/19/85
4,553,888                       06/507,037                      11/19/85
4,553,893                       06/702,631                      11/19/85
4,553,895                       06/605,213                      11/19/85
4,553,903                       06/627,634                      11/19/85
4,553,905                       06/608,514                      11/19/85
4,553,906                       06/654,678                      11/19/85
4,553,907                       06/667,777                      11/19/85
4,553,914                       06/583,353                      11/19/85
4,553,916                       06/639,101                      11/19/85
4,553,917                       06/451,896                      11/19/85
4,553,918                       06/608,590                      11/19/85
4,553,923                       06/658,574                      11/19/85
4,553,924                       06/617,060                      11/19/85
4,553,925                       06/422,531                      11/19/85
4,553,929                       06/615,905                      11/19/85
4,553,931                       06/591,812                      11/19/85
4,553,941                       06/662,729                      11/19/85
4,553,947                       06/601,006                      11/19/85
4,553,962                       06/570,772                      11/19/85
4,553,968                       06/492,145                      11/19/85
4,553,969                       06/475,220                      11/19/85
4,553,970                       06/466,253                      11/19/85
4,553,971                       06/568,200                      11/19/85
4,553,972                       06/496,729                      11/19/85
4,553,976                       06/570,255                      11/19/85
4,553,985                       06/583,469                      11/19/85
4,553,987                       06/571,658                      11/19/85
4,553,989                       06/563,388                      11/19/85
4,553,992                       06/661,919                      11/19/85
4,554,001                       06/533,505                      11/19/85
4,554,003                       06/483,383                      11/19/85
4,554,004                       06/543,488                      11/19/85
4,554,008                       06/529,320                      11/19/85
4,554,010                       06/559,126                      11/19/85
4,554,011                       06/645,451                      11/19/85
4,554,014                       06/602,305                      11/19/85
4,554,015                       06/506,892                      11/19/85
4,554,016                       06/398,170                      11/19/85
4,554,030                       06/585,649                      11/19/85
4,554,031                       06/604,937                      11/19/85
4,554,035                       06/589,052                      11/19/85
4,554,040                       06/559,214                      11/19/85
4,554,042                       06/671,001                      11/19/85
4,554,052                       06/626,549                      11/19/85
4,554,055                       06/472,819                      11/19/85
4,554,064                       06/594,361                      11/19/85
4,554,066                       06/568,093                      11/19/85
4,554,067                       06/703,084                      11/19/85
4,554,073                       06/587,633                      11/19/85
4,554,083                       06/624,541                      11/19/85
4,554,084                       06/555,514                      11/19/85
4,554,085                       06/573,276                      11/19/85
4,554,087                       06/695,867                      11/19/85
4,554,091                       06/617,202                      11/19/85
4,554,092                       06/508,519                      11/19/85
4,554,093                       06/625,323                      11/19/85
4,554,094                       06/626,508                      11/19/85
4,554,100                       06/406,168                      11/19/85
4,554,109                       06/561,754                      11/19/85
4,554,113                       06/628,403                      11/19/85
4,554,115                       06/628,157                      11/19/85
4,554,119                       06/483,799                      11/19/85
4,554,122                       06/639,869                      11/19/85
4,554,123                       06/609,110                      11/19/85
4,554,127                       06/217,092                      11/19/85
4,554,131                       06/655,486                      11/19/85
4,554,133                       06/536,515                      11/19/85
4,554,136                       06/481,208                      11/19/85
4,554,138                       06/666,519                      11/19/85
4,554,139                       06/618,142                      11/19/85
4,554,144                       06/568,707                      11/19/85
4,554,145                       06/600,681                      11/19/85
4,554,149                       06/518,704                      11/19/85
4,554,151                       06/536,378                      11/19/85
4,554,153                       06/626,819                      11/19/85
4,554,158                       06/482,899                      11/19/85
4,554,162                       06/607,056                      11/19/85
4,554,165                       06/400,653                      11/19/85
4,554,171                       06/497,112                      11/19/85
4,554,188                       06/455,699                      11/19/85
4,554,193                       06/612,381                      11/19/85
4,554,194                       06/536,103                      11/19/85
4,554,197                       06/621,932                      11/19/85
4,554,201                       06/605,862                      11/19/85
4,554,205                       06/709,222                      11/19/85
4,554,210                       06/597,975                      11/19/85
4,554,211                       06/519,496                      11/19/85
4,554,213                       06/676,300                      11/19/85
4,554,215                       06/552,316                      11/19/85
4,554,219                       06/615,271                      11/19/85
4,554,224                       06/575,215                      11/19/85
4,554,225                       06/715,779                      11/19/85
4,554,237                       06/452,198                      11/19/85
4,554,238                       06/591,419                      11/19/85
4,554,246                       06/541,649                      11/19/85
4,554,247                       06/579,765                      11/19/85
4,554,249                       06/436,385                      11/19/85
4,554,250                       06/509,501                      11/19/85
4,554,252                       06/449,071                      11/19/85
4,554,254                       06/682,338                      11/19/85
4,554,260                       06/630,636                      11/19/85
4,554,265                       06/626,172                      11/19/85
4,554,268                       06/650,745                      11/19/85
4,554,277                       06/705,172                      11/19/85
4,554,278                       06/517,916                      11/19/85
4,554,280                       06/560,698                      11/19/85
4,554,282                       06/520,874                      11/19/85
4,554,284                       06/649,466                      11/19/85
4,554,287                       06/649,465                      11/19/85
4,554,288                       06/597,504                      11/19/85
4,554,294                       06/678,311                      11/19/85
4,554,295                       06/513,431                      11/19/85
4,554,301                       06/591,261                      11/19/85
4,554,305                       06/717,047                      11/19/85
4,554,306                       06/618,347                      11/19/85
4,554,322                       06/591,358                      11/19/85
4,554,332                       06/510,796                      11/19/85
4,554,345                       06/490,284                      11/19/85
4,554,348                       06/573,237                      11/19/85
4,554,349                       06/540,594                      11/19/85
4,554,352                       06/537,078                      11/19/85
4,554,363                       06/516,602                      11/19/85
4,554,364                       06/683,547                      11/19/85
4,554,365                       06/635,784                      11/19/85
4,554,366                       06/624,550                      11/19/85
4,554,367                       06/535,528                      11/19/85
4,554,373                       06/668,147                      11/19/85
4,554,374                       06/644,416                      11/19/85
4,554,375                       06/589,804                      11/19/85
4,554,377                       06/631,047                      11/19/85
4,554,379                       06/724,494                      11/19/85
4,554,381                       06/392,885                      11/19/85
4,554,387                       06/604,891                      11/19/85
4,554,388                       06/577,849                      11/19/85
4,554,389                       06/598,058                      11/19/85
4,554,390                       06/511,135                      11/19/85
4,554,391                       06/642,989                      11/19/85
4,554,396                       06/651,748                      11/19/85
4,554,403                       06/658,234                      11/19/85
4,554,404                       06/593,458                      11/19/85
4,554,416                       06/473,384                      11/19/85
4,554,422                       06/536,406                      11/19/85
4,554,427                       06/562,602                      11/19/85
4,554,432                       06/658,121                      11/19/85
4,554,434                       06/567,909                      11/19/85
4,554,435                       06/553,340                      11/19/85
4,554,438                       06/603,329                      11/19/85
4,554,441                       06/703,182                      11/19/85
4,554,443                       06/495,472                      11/19/85
4,554,445                       06/607,836                      11/19/85
4,554,456                       06/408,319                      11/19/85
4,554,459                       06/331,089                      11/19/85
4,554,471                       06/710,940                      11/19/85
4,554,472                       06/504,165                      11/19/85
4,554,475                       06/617,240                      11/19/85
4,554,480                       06/556,184                      11/19/85
4,554,483                       06/537,474                      11/19/85
4,554,484                       06/527,626                      11/19/85
4,554,490                       06/540,592                      11/19/85
4,554,491                       06/639,331                      11/19/85
4,554,493                       06/584,716                      11/19/85
4,554,494                       06/653,869                      11/19/85
4,554,500                       06/480,746                      11/19/85
4,554,505                       06/503,002                      11/19/85
4,554,516                       06/676,043                      11/19/85
4,554,517                       06/560,975                      11/19/85
4,554,518                       06/620,259                      11/19/85
4,554,519                       06/542,840                      11/19/85
4,554,520                       06/541,524                      11/19/85
4,554,523                       06/658,026                      11/19/85
4,554,526                       06/643,577                      11/19/85
4,554,528                       06/525,724                      11/19/85
4,554,534                       06/468,481                      11/19/85
4,554,536                       06/478,114                      11/19/85
4,554,539                       06/440,116                      11/19/85
4,554,543                       06/473,392                      11/19/85
4,554,544                       06/536,142                      11/19/85
4,554,546                       06/442,581                      11/19/85
4,554,554                       06/528,825                      11/19/85
4,554,557                       06/725,518                      11/19/85
4,554,564                       06/345,994                      11/19/85
4,554,570                       06/500,399                      11/19/85
4,554,574                       06/735,708                      11/19/85
4,554,575                       06/493,903                      11/19/85
4,554,581                       06/701,713                      11/19/85
4,554,593                       06/409,239                      11/19/85
4,554,595                       06/448,786                      11/19/85
4,554,601                       06/413,660                      11/19/85
4,554,607                       06/428,502                      11/19/85
4,554,612                       06/637,995                      11/19/85
4,554,613                       06/546,997                      11/19/85
4,554,615                       06/500,035                      11/19/85
4,554,620                       06/613,810                      11/19/85
4,554,634                       06/474,322                      11/19/85
4,554,637                       06/396,730                      11/19/85
4,554,638                       06/650,565                      11/19/85
4,554,648                       06/409,251                      11/19/85
4,554,650                       06/364,818                      11/19/85
4,554,670                       06/484,676                      11/19/85
4,554,676                       06/475,824                      11/19/85
4,554,678                       06/449,349                      11/19/85
4,554,679                       06/551,922                      11/19/85
4,554,680                       06/519,154                      11/19/85
4,881,278                       07/141,835                      11/21/89
4,881,280                       07/279,431                      11/21/89
4,881,282                       07/230,356                      11/21/89
4,881,285                       07/266,844                      11/21/89
4,881,299                       07/156,250                      11/21/89
4,881,300                       07/280,347                      11/21/89
4,881,301                       07/130,012                      11/21/89
4,881,302                       07/215,998                      11/21/89
4,881,307                       07/067,709                      11/21/89
4,881,309                       07/122,068                      11/21/89
4,881,314                       07/248,188                      11/21/89
4,881,317                       07/313,175                      11/21/89
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