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 June 10, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,729                  07/031,950                   08/09/88
(4,593,797)                (06/631,454)                (06/10/86)
4,593,416                   06/679,224                   06/10/86
4,593,422                   06/518,641                   06/10/86
4,593,425                   06/782,599                   06/10/86
4,593,427                   06/642,083                   06/10/86
4,593,436                   06/773,092                   06/10/86
4,593,445                   06/670,774                   06/10/86
4,593,446                   06/601,770                   06/10/86
4,593,447                   06/766,769                   06/10/86
4,593,448                   06/711,362                   06/10/86
4,593,451                   06/477,027                   06/10/86
4,593,452                   06/705,596                   06/10/86
4,593,456                   06/721,750                   06/10/86
4,593,459                   06/687,409                   06/10/86
4,593,465                   06/669,454                   06/10/86
4,593,467                   06/725,104                   06/10/86
4,593,474                   06/668,479                   06/10/86
4,593,477                   06/691,339                   06/10/86
4,593,483                   06/555,555                   06/10/86
4,593,487                   06/716,731                   06/10/86
4,593,492                   06/644,937                   06/10/86
4,593,495                   06/674,663                   06/10/86
4,593,499                   06/674,086                   06/10/86
4,593,506                   06/517,366                   06/10/86
4,593,507                   06/669,074                   06/10/86
4,593,516                   06/697,984                   06/10/86
4,593,517                   06/726,104                   06/10/86
4,593,529                   06/677,740                   06/10/86
4,593,530                   06/598,622                   06/10/86
4,593,532                   06/669,327                   06/10/86
4,593,535                   06/686,877                   06/10/86
4,593,542                   06/518,448                   06/10/86
4,593,544                   06/447,100                   06/10/86
4,593,558                   06/704,582                   06/10/86
4,593,560                   06/725,955                   06/10/86
4,593,565                   06/521,325                   06/10/86
4,593,568                   06/691,002                   06/10/86
4,593,591                   06/557,185                   06/10/86
4,593,593                   06/684,276                   06/10/86
4,593,594                   06/633,858                   06/10/86
4,593,595                   06/659,690                   06/10/86
4,593,596                   06/695,437                   06/10/86
4,593,608                   06/605,782                   06/10/86
4,593,617                   06/701,570                   06/10/86
4,593,623                   06/598,847                   06/10/86
4,593,625                   06/521,549                   06/10/86
4,593,632                   06/635,585                   06/10/86
4,593,641                   06/638,393                   06/10/86
4,593,648                   06/602,725                   06/10/86
4,593,650                   06/704,874                   06/10/86
4,593,652                   06/684,500                   06/10/86
4,593,660                   06/478,284                   06/10/86
4,593,662                   06/774,443                   06/10/86
4,593,667                   06/713,534                   06/10/86
4,593,680                   06/678,336                   06/10/86
4,593,682                   06/653,705                   06/10/86
4,593,690                   06/625,822                   06/10/86
4,593,693                   06/727,546                   06/10/86
4,593,697                   06/701,177                   06/10/86
4,593,698                   06/673,668                   06/10/86
4,593,701                   06/643,291                   06/10/86
4,593,708                   06/597,950                   06/10/86
4,593,712                   06/664,314                   06/10/86
4,593,717                   06/522,563                   06/10/86
4,593,722                   06/676,619                   06/10/86
4,593,728                   06/626,856                   06/10/86
4,593,729                   06/662,620                   06/10/86
4,593,734                   06/646,440                   06/10/86
4,593,735                   06/477,881                   06/10/86
4,593,736                   06/689,975                   06/10/86
4,593,748                   06/633,183                   06/10/86
4,593,776                   06/744,826                   06/10/86
4,593,777                   06/578,183                   06/10/86
4,593,779                   06/745,060                   06/10/86
4,593,781                   06/681,492                   06/10/86
4,593,784                   06/606,471                   06/10/86
4,593,794                   06/602,829                   06/10/86
4,593,796                   06/732,804                   06/10/86
4,593,798                   06/490,710                   06/10/86
4,593,799                   06/587,111                   06/10/86
4,593,805                   06/671,559                   06/10/86
4,593,806                   06/539,931                   06/10/86
4,593,817                   06/721,763                   06/10/86
4,593,831                   06/675,465                   06/10/86
4,593,833                   06/780,208                   06/10/86
4,593,844                   06/526,947                   06/10/86
4,593,847                   06/729,422                   06/10/86
4,593,859                   06/611,069                   06/10/86
4,593,864                   06/694,118                   06/10/86
4,593,868                   06/540,713                   06/10/86
4,593,869                   06/660,422                   06/10/86
4,593,888                   06/729,307                   06/10/86
4,593,893                   06/717,986                   06/10/86
4,593,913                   06/622,787                   06/10/86
4,593,914                   06/531,642                   06/10/86
4,593,916                   06/741,256                   06/10/86
4,593,922                   06/637,490                   06/10/86
4,593,923                   06/729,926                   06/10/86
4,593,926                   06/639,728                   06/10/86
4,593,933                   06/573,052                   06/10/86
4,593,935                   06/644,901                   06/10/86
4,593,936                   06/586,857                   06/10/86
4,593,945                   06/589,596                   06/10/86
4,593,949                   06/655,075                   06/10/86
4,593,950                   06/489,482                   06/10/86
4,593,951                   06/668,307                   06/10/86
4,593,960                   06/716,715                   06/10/86
4,593,961                   06/683,849                   06/10/86
4,593,973                   06/507,643                   06/10/86
4,593,994                   06/712,646                   06/10/86
4,593,997                   06/623,068                   06/10/86
4,594,000                   06/481,987                   06/10/86
4,594,007                   06/571,550                   06/10/86
4,594,011                   06/561,730                   06/10/86
4,594,013                   06/616,146                   06/10/86
4,594,018                   06/638,966                   06/10/86
4,594,026                   06/613,983                   06/10/86
4,594,032                   06/505,593                   06/10/86
4,594,033                   06/634,874                   06/10/86
4,594,035                   06/653,969                   06/10/86
4,594,036                   06/496,498                   06/10/86
4,594,038                   06/673,182                   06/10/86
4,594,053                   06/715,494                   06/10/86
4,594,065                   06/645,879                   06/10/86
4,594,075                   06/693,392                   06/10/86
4,594,086                   06/583,608                   06/10/86
4,594,100                   06/302,948                   06/10/86
4,594,103                   06/713,402                   06/10/86
4,594,109                   06/766,345                   06/10/86
4,594,113                   06/738,598                   06/10/86
4,594,133                   06/776,195                   06/10/86
4,594,135                   06/703,581                   06/10/86
4,594,144                   06/744,824                   06/10/86
4,594,147                   06/809,652                   06/10/86
4,594,148                   06/701,264                   06/10/86
4,594,152                   06/636,785                   06/10/86
4,594,158                   06/298,866                   06/10/86
4,594,162                   06/579,761                   06/10/86
4,594,171                   06/624,563                   06/10/86
4,594,175                   06/646,256                   06/10/86
4,594,176                   06/744,398                   06/10/86
4,594,180                   06/657,266                   06/10/86
4,594,184                   06/737,293                   06/10/86
4,594,187                   06/680,460                   06/10/86
4,594,192                   06/713,941                   06/10/86
4,594,203                   06/588,963                   06/10/86
4,594,218                   06/744,490                   06/10/86
4,594,220                   06/685,678                   06/10/86
4,594,222                   06/356,637                   06/10/86
4,594,226                   06/583,042                   06/10/86
4,594,227                   06/530,298                   06/10/86
4,594,230                   06/697,661                   06/10/86
4,594,239                   06/589,595                   06/10/86
4,594,240                   06/530,070                   06/10/86
4,594,246                   06/564,901                   06/10/86
4,594,248                   06/712,294                   06/10/86
4,594,256                   06/710,332                   06/10/86
4,594,257                   06/710,348                   06/10/86
4,594,258                   06/710,761                   06/10/86
4,594,264                   06/673,467                   06/10/86
4,594,271                   06/787,408                   06/10/86
4,594,273                   06/672,518                   06/10/86
4,594,275                   06/633,585                   06/10/86
4,594,278                   06/718,235                   06/10/86
4,594,281                   06/714,324                   06/10/86
4,594,289                   06/635,778                   06/10/86
4,594,311                   06/665,952                   06/10/86
4,594,312                   06/586,767                   06/10/86
4,594,326                   06/492,705                   06/10/86
4,594,330                   06/712,036                   06/10/86
4,594,333                   06/646,200                   06/10/86
4,594,334                   06/703,071                   06/10/86
4,594,335                   06/609,381                   06/10/86
4,594,345                   06/507,692                   06/10/86
4,594,348                   06/698,653                   06/10/86
4,594,352                   06/601,923                   06/10/86
4,594,353                   06/593,278                   06/10/86
4,594,362                   06/793,166                   06/10/86
4,594,364                   06/691,321                   06/10/86
4,594,366                   06/679,611                   06/10/86
4,594,374                   06/706,672                   06/10/86
4,594,377                   06/740,661                   06/10/86
4,594,381                   06/741,410                   06/10/86
4,594,385                   06/411,137                   06/10/86
4,594,391                   06/786,137                   06/10/86
4,594,392                   06/794,313                   06/10/86
4,594,393                   06/665,595                   06/10/86
4,594,394                   06/711,931                   06/10/86
4,594,399                   06/709,995                   06/10/86
4,594,400                   06/652,683                   06/10/86
4,594,403                   06/744,206                   06/10/86
4,594,405                   06/572,036                   06/10/86
4,594,408                   06/754,700                   06/10/86
4,594,418                   06/781,629                   06/10/86
4,594,420                   06/588,541                   06/10/86
4,594,422                   06/710,262                   06/10/86
4,594,426                   06/225,820                   06/10/86
4,594,434                   06/668,597                   06/10/86
4,594,436                   06/707,037                   06/10/86
4,594,447                   06/657,292                   06/10/86
4,594,450                   06/660,369                   06/10/86
4,594,451                   06/601,968                   06/10/86
4,594,456                   06/572,239                   06/10/86
4,594,458                   06/730,067                   06/10/86
4,594,459                   06/715,550                   06/10/86
4,594,462                   06/748,998                   06/10/86
4,594,467                   06/763,094                   06/10/86
4,594,472                   06/546,579                   06/10/86
4,594,474                   06/697,736                   06/10/86
4,594,475                   06/637,373                   06/10/86
4,594,483                   06/611,304                   06/10/86
4,594,484                   06/713,267                   06/10/86
4,594,485                   06/719,877                   06/10/86
4,594,486                   06/701,549                   06/10/86
4,594,493                   06/517,190                   06/10/86
4,594,494                   06/698,785                   06/10/86
4,594,497                   06/736,691                   06/10/86
4,594,528                   06/532,977                   06/10/86
4,594,531                   06/633,756                   06/10/86
4,594,537                   06/566,004                   06/10/86
4,594,549                   06/609,906                   06/10/86
4,594,552                   06/511,413                   06/10/86
4,594,557                   06/754,059                   06/10/86
4,594,564                   06/619,096                   06/10/86
4,594,566                   06/646,370                   06/10/86
4,594,572                   06/445,427                   06/10/86
4,594,578                   06/643,210                   06/10/86
4,594,581                   06/572,425                   06/10/86
4,594,588                   06/472,778                   06/10/86
4,594,590                   06/548,791                   06/10/86
4,594,595                   06/601,420                   06/10/86
4,594,596                   06/710,955                   06/10/86
4,594,597                   06/765,079                   06/10/86
4,594,601                   06/535,333                   06/10/86
4,594,602                   06/599,166                   06/10/86
4,594,607                   06/619,369                   06/10/86
4,594,611                   06/594,661                   06/10/86
4,594,612                   06/690,249                   06/10/86
4,594,621                   06/649,654                   06/10/86
4,594,626                   06/579,313                   06/10/86
4,594,632                   06/602,349                   06/10/86
4,594,642                   06/729,352                   06/10/86
4,594,647                   06/677,060                   06/10/86
4,594,656                   06/810,537                   06/10/86
4,594,672                   06/538,876                   06/10/86
4,594,674                   06/467,973                   06/10/86
4,594,677                   06/550,150                   06/10/86
4,594,679                   06/515,845                   06/10/86
4,594,682                   06/452,190                   06/10/86
4,594,683                   06/509,218                   06/10/86
4,594,684                   06/768,749                   06/10/86
4,594,693                   06/548,901                   06/10/86
4,594,694                   06/528,962                   06/10/86
4,594,712                   06/564,133                   06/10/86
4,594,713                   06/564,135                   06/10/86
4,594,716                   06/775,088                   06/10/86
4,594,721                   06/687,030                   06/10/86
4,594,725                   06/608,060                   06/10/86
4,594,728                   06/624,718                   06/10/86
4,930,161                   07/335,883                   06/05/90
4,930,163                   07/284,909                   06/05/90
4,930,168                   07/358,125                   06/05/90
4,930,171                   07/347,170                   06/05/90
4,930,188                   07/411,897                   06/05/90
4,930,196                   07/325,187                   06/05/90
4,930,199                   07/281,380                   06/05/90
4,930,202                   07/325,168                   06/05/90
4,930,209                   07/380,225                   06/05/90
4,930,214                   07/099,383                   06/05/90
4,930,224                   07/231,890                   06/05/90
4,930,234                   07/349,050                   06/05/90
4,930,239                   07/371,835                   06/05/90
4,930,241                   07/404,081                   06/05/90
4,930,246                   07/372,093                   06/05/90
4,930,249                   07/250,161                   06/05/90
4,930,260                   07/269,283                   06/05/90
4,930,263                   07/353,718                   06/05/90
4,930,264                   07/412,482                   06/05/90
4,930,276                   07/378,594                   06/05/90
4,930,278                   07/201,227                   06/05/90
4,930,279                   07/276,574                   06/05/90
4,930,284                   07/341,276                   06/05/90
4,930,285                   07/295,109                   06/05/90
4,930,288                   07/191,648                   06/05/90
4,930,293                   07/309,117                   06/05/90
4,930,294                   07/400,126                   06/05/90
4,930,300                   07/361,017                   06/05/90
4,930,301                   07/276,788                   06/05/90
4,930,305                   07/252,690                   06/05/90
4,930,316                   07/217,162                   06/05/90
4,930,321                   07/325,531                   06/05/90
4,930,322                   07/405,828                   06/05/90
4,930,331                   07/315,284                   06/05/90
4,930,342                   07/106,229                   06/05/90
4,930,343                   07/329,344                   06/05/90
4,930,345                   07/191,288                   06/05/90
4,930,349                   07/193,404                   06/05/90
4,930,356                   07/341,004                   06/05/90
4,930,361                   07/395,883                   06/05/90
4,930,363                   07/358,008                   06/05/90
4,930,365                   07/247,083                   06/05/90
4,930,373                   07/258,770                   06/05/90
4,930,377                   07/311,706                   06/05/90
4,930,379                   07/232,037                   06/05/90
4,930,389                   07/373,159                   06/05/90
4,930,392                   07/366,600                   06/05/90
4,930,395                   07/351,517                   06/05/90
4,930,399                   07/294,410                   06/05/90
4,930,401                   07/263,690                   06/05/90
4,930,406                   07/247,405                   06/05/90
4,930,413                   07/334,354                   06/05/90
4,930,415                   07/301,044                   06/05/90
4,930,419                   07/355,768                   06/05/90
4,930,421                   07/217,268                   06/05/90
4,930,422                   07/198,091                   06/05/90
4,930,423                   07/300,638                   06/05/90
4,930,428                   07/360,284                   06/05/90
4,930,429                   07/402,076                   06/05/90
4,930,431                   07/377,043                   06/05/90
4,930,435                   07/330,194                   06/05/90
4,930,443                   07/281,648                   06/05/90
4,930,446                   07/228,390                   06/05/90
4,930,451                   07/226,057                   06/05/90
4,930,453                   07/284,941                   06/05/90
4,930,454                   06/292,761                   06/05/90
4,930,456                   07/436,903                   06/05/90
4,930,459                   07/383,866                   06/05/90
4,930,465                   07/416,339                   06/05/90
4,930,466                   07/367,799                   06/05/90
4,930,470                   07/462,520                   06/05/90
4,930,477                   07/258,685                   06/05/90
4,930,483                   07/392,484                   06/05/90
4,930,485                   07/405,234                   06/05/90
4,930,486                   07/266,703                   06/05/90
4,930,490                   07/357,775                   06/05/90
4,930,491                   07/312,473                   06/05/90
4,930,506                   07/340,339                   06/05/90
4,930,529                   07/203,054                   06/05/90
4,930,534                   07/219,099                   06/05/90
4,930,537                   07/360,253                   06/05/90
4,930,542                   07/349,894                   06/05/90
4,930,546                   06/801,962                   06/05/90
4,930,548                   07/407,582                   06/05/90
4,930,575                   07/331,934                   06/05/90
4,930,576                   07/340,110                   06/05/90
4,930,580                   07/224,463                   06/05/90
4,930,585                   07/328,114                   06/05/90
4,930,588                   07/398,958                   06/05/90
4,930,589                   07/362,878                   06/05/90
4,930,592                   07/374,695                   06/05/90
4,930,594                   07/187,541                   06/05/90
4,930,599                   07/394,798                   06/05/90
4,930,602                   07/332,513                   06/05/90
4,930,606                   07/224,097                   06/05/90
4,930,608                   07/348,366                   06/05/90
4,930,609                   07/336,023                   06/05/90
4,930,612                   07/274,961                   06/05/90
4,930,615                   07/324,250                   06/05/90
4,930,616                   07/235,240                   06/05/90
4,930,617                   07/396,670                   06/05/90
4,930,618                   07/290,255                   06/05/90
4,930,622                   07/328,926                   06/05/90
4,930,628                   07/273,563                   06/05/90
4,930,629                   07/423,027                   06/05/90
4,930,632                   07/279,876                   06/05/90
4,930,637                   07/232,802                   06/05/90
4,930,641                   07/380,388                   06/05/90
4,930,646                   07/305,412                   06/05/90
4,930,648                   07/363,503                   06/05/90
4,930,654                   07/331,682                   06/05/90
4,930,667                   07/299,934                   06/05/90
4,930,670                   07/342,838                   06/05/90
4,930,681                   07/233,224                   06/05/90
4,930,682                   07/450,938                   06/05/90
4,930,688                   07/311,465                   06/05/90
4,930,690                   07/281,086                   06/05/90
4,930,693                   07/323,503                   06/05/90
4,930,694                   07/365,303                   06/05/90
4,930,696                   07/386,667                   06/05/90
4,930,700                   07/260,096                   06/05/90
4,930,703                   07/288,393                   06/05/90
4,930,704                   07/227,088                   06/05/90
4,930,706                   07/252,157                   06/05/90
4,930,708                   07/370,685                   06/05/90
4,930,712                   07/349,477                   06/05/90
4,930,714                   07/335,940                   06/05/90
4,930,722                   07/169,875                   06/05/90
4,930,725                   07/285,822                   06/05/90
4,930,739                   07/222,508                   06/05/90
4,930,744                   07/319,576                   06/05/90
4,930,746                   07/385,748                   06/05/90
4,930,749                   07/352,160                   06/05/90
4,930,757                   07/416,198                   06/05/90
4,930,759                   07/355,463                   06/05/90
4,930,760                   07/293,336                   06/05/90
4,930,770                   07/278,671                   06/05/90
4,930,773                   07/177,611                   06/05/90
4,930,776                   07/389,228                   06/05/90
4,930,781                   07/232,960                   06/05/90
4,930,783                   06/651,716                   06/05/90
4,930,787                   07/401,099                   06/05/90
4,930,790                   07/206,525                   06/05/90
4,930,792                   07/276,535                   06/05/90
4,930,801                   07/098,483                   06/05/90
4,930,802                   07/131,744                   06/05/90
4,930,803                   07/250,908                   06/05/90
4,930,810                   07/326,114                   06/05/90
4,930,813                   07/243,406                   06/05/90
4,930,814                   07/339,927                   06/05/90
4,930,816                   07/352,933                   06/05/90
4,930,818                   07/331,591                   06/05/90
4,930,824                   07/345,349                   06/05/90
4,930,825                   07/331,842                   06/05/90
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