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 July 1, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

4,597,108                   06/675,896                   07/01/86
4,597,109                   06/531,393                   07/01/86
4,597,112                   06/731,943                   07/01/86
4,597,114                   06/692,659                   07/01/86
4,597,120                   06/714,069                   07/01/86
4,597,121                   06/600,010                   07/01/86
4,597,133                   06/699,953                   07/01/86
4,597,138                   06/690,469                   07/01/86
4,597,139                   06/574,550                   07/01/86
4,597,142                   06/647,132                   07/01/86
4,597,143                   06/607,246                   07/01/86
4,597,149                   06/782,108                   07/01/86
4,597,153                   06/652,228                   07/01/86
4,597,158                   06/502,514                   07/01/86
4,597,169                   06/617,364                   07/01/86
4,597,174                   06/775,924                   07/01/86
4,597,181                   06/609,221                   07/01/86
4,597,190                   06/700,682                   07/01/86
4,597,199                   06/698,696                   07/01/86
4,597,206                   06/658,924                   07/01/86
4,597,212                   06/519,077                   07/01/86
4,597,217                   06/583,942                   07/01/86
4,597,219                   06/637,116                   07/01/86
4,597,220                   06/591,794                   07/01/86
4,597,229                   06/617,043                   07/01/86
4,597,233                   06/586,418                   07/01/86
4,597,234                   06/568,083                   07/01/86
4,597,243                   06/634,029                   07/01/86
4,597,251                   06/729,861                   07/01/86
4,597,268                   06/698,482                   07/01/86
4,597,274                   06/711,969                   07/01/86
4,597,287                   06/651,827                   07/01/86
4,597,288                   06/715,496                   07/01/86
4,597,290                   06/601,838                   07/01/86
4,597,293                   06/689,955                   07/01/86
4,597,297                   06/584,367                   07/01/86
4,597,304                   06/658,525                   07/01/86
4,597,305                   06/618,883                   07/01/86
4,597,324                   06/599,777                   07/01/86
4,597,338                   06/671,316                   07/01/86
4,597,341                   06/736,670                   07/01/86
4,597,346                   06/589,511                   07/01/86
4,597,351                   06/507,946                   07/01/86
4,597,353                   06/657,015                   07/01/86
4,597,361                   06/585,131                   07/01/86
4,597,368                   06/705,143                   07/01/86
4,597,372                   06/753,602                   07/01/86
4,597,374                   06/387,439                   07/01/86
4,597,377                   06/658,754                   07/01/86
4,597,379                   06/478,813                   07/01/86
4,597,381                   06/671,355                   07/01/86
4,597,385                   06/689,711                   07/01/86
4,597,390                   06/595,818                   07/01/86
4,597,399                   06/682,365                   07/01/86
4,597,403                   06/474,829                   07/01/86
4,597,409                   06/779,606                   07/01/86
4,597,416                   06/652,747                   07/01/86
4,597,428                   06/575,864                   07/01/86
4,597,433                   06/639,307                   07/01/86
4,597,436                   06/551,725                   07/01/86
4,597,442                   06/705,773                   07/01/86
4,597,448                   06/546,530                   07/01/86
4,597,455                   06/719,613                   07/01/86
4,597,458                   06/663,568                   07/01/86
4,597,463                   06/573,034                   07/01/86
4,597,466                   06/737,654                   07/01/86
4,597,475                   06/525,051                   07/01/86
4,597,478                   06/629,503                   07/01/86
4,597,487                   06/518,148                   07/01/86
4,597,509                   06/671,120                   07/01/86
4,597,513                   06/633,720                   07/01/86
4,597,514                   06/546,022                   07/01/86
4,597,525                   06/712,727                   07/01/86
4,597,527                   06/553,037                   07/01/86
4,597,528                   06/659,422                   07/01/86
4,597,530                   06/655,890                   07/01/86
4,597,541                   06/665,663                   07/01/86
4,597,545                   06/732,457                   07/01/86
4,597,551                   06/709,640                   07/01/86
4,597,559                   06/719,065                   07/01/86
4,597,562                   06/550,266                   07/01/86
4,597,570                   06/678,197                   07/01/86
4,597,571                   06/624,555                   07/01/86
4,597,583                   06/752,616                   07/01/86
4,597,586                   06/658,538                   07/01/86
4,597,596                   06/668,936                   07/01/86
4,597,606                   06/650,954                   07/01/86
4,597,607                   06/649,182                   07/01/86
4,597,611                   06/646,118                   07/01/86
4,597,612                   06/698,455                   07/01/86
4,597,618                   06/562,636                   07/01/86
4,597,619                   06/679,794                   07/01/86
4,597,633                   06/697,516                   07/01/86
4,597,644                   06/652,796                   07/01/86
4,597,649                   06/546,501                   07/01/86
4,597,651                   06/522,230                   07/01/86
4,597,652                   06/621,413                   07/01/86
4,597,660                   06/356,543                   07/01/86
4,597,674                   06/595,561                   07/01/86
4,597,686                   06/617,972                   07/01/86
4,597,688                   06/651,016                   07/01/86
4,597,701                   06/701,850                   07/01/86
4,597,702                   06/581,560                   07/01/86
4,597,706                   06/674,502                   07/01/86
4,597,715                   06/612,411                   07/01/86
4,597,723                   06/385,611                   07/01/86
4,597,737                   06/641,610                   07/01/86
4,597,754                   06/577,757                   07/01/86
4,597,764                   06/655,622                   07/01/86
4,597,766                   06/665,546                   07/01/86
4,597,768                   06/506,330                   07/01/86
4,597,773                   06/635,871                   07/01/86
4,597,779                   06/706,371                   07/01/86
4,597,785                   06/636,525                   07/01/86
4,597,790                   06/736,329                   07/01/86
4,597,792                   06/742,830                   07/01/86
4,597,805                   06/702,177                   07/01/86
4,597,812                   06/581,811                   07/01/86
4,597,825                   06/718,987                   07/01/86
4,597,829                   06/709,278                   07/01/86
4,597,834                   06/581,344                   07/01/86
4,597,835                   06/675,695                   07/01/86
4,597,841                   06/693,946                   07/01/86
4,597,844                   06/711,018                   07/01/86
4,597,847                   06/658,738                   07/01/86
4,597,851                   06/624,105                   07/01/86
4,597,854                   06/755,767                   07/01/86
4,597,863                   06/594,280                   07/01/86
4,597,870                   06/736,869                   07/01/86
4,597,877                   06/696,489                   07/01/86
4,597,883                   06/733,894                   07/01/86
4,597,886                   06/660,606                   07/01/86
4,597,889                   06/645,588                   07/01/86
4,597,890                   06/702,289                   07/01/86
4,597,893                   06/501,367                   07/01/86
4,597,894                   06/597,456                   07/01/86
4,597,904                   06/641,607                   07/01/86
4,597,905                   06/644,914                   07/01/86
4,597,910                   06/796,128                   07/01/86
4,597,914                   06/507,156                   07/01/86
4,597,915                   06/573,488                   07/01/86
4,597,925                   06/752,033                   07/01/86
4,597,935                   06/718,205                   07/01/86
4,597,942                   06/523,050                   07/01/86
4,597,946                   06/728,969                   07/01/86
4,597,948                   06/569,439                   07/01/86
4,597,952                   06/747,955                   07/01/86
4,597,953                   06/703,323                   07/01/86
4,597,954                   06/427,958                   07/01/86
4,597,956                   06/707,804                   07/01/86
4,597,959                   06/373,342                   07/01/86
4,597,975                   06/540,372                   07/01/86
4,597,976                   06/558,907                   07/01/86
4,597,978                   06/686,882                   07/01/86
4,597,982                   06/549,400                   07/01/86
4,597,990                   06/769,979                   07/01/86
4,597,992                   06/688,550                   07/01/86
4,597,993                   06/661,157                   07/01/86
4,597,996                   06/778,055                   07/01/86
4,598,001                   06/591,542                   07/01/86
4,598,003                   06/719,741                   07/01/86
4,598,013                   06/484,367                   07/01/86
4,598,015                   06/680,456                   07/01/86
4,598,019                   06/678,462                   07/01/86
4,598,029                   06/786,931                   07/01/86
4,598,040                   06/531,611                   07/01/86
4,598,049                   06/528,053                   07/01/86
4,598,050                   06/557,447                   07/01/86
4,598,055                   06/720,780                   07/01/86
4,598,066                   06/535,332                   07/01/86
4,598,069                   06/718,082                   07/01/86
4,598,072                   06/448,673                   07/01/86
4,598,078                   06/543,496                   07/01/86
4,598,094                   06/780,054                   07/01/86
4,598,098                   06/756,898                   07/01/86
4,598,100                   06/756,896                   07/01/86
4,598,101                   06/759,776                   07/01/86
4,598,107                   06/763,157                   07/01/86
4,598,112                   06/650,448                   07/01/86
4,598,113                   06/765,641                   07/01/86
4,598,117                   06/691,027                   07/01/86
4,598,119                   06/466,767                   07/01/86
4,598,120                   06/724,140                   07/01/86
4,598,121                   06/741,359                   07/01/86
4,598,122                   06/693,484                   07/01/86
4,598,138                   06/548,693                   07/01/86
4,598,140                   06/652,531                   07/01/86
4,598,142                   06/727,983                   07/01/86
4,598,144                   06/710,557                   07/01/86
4,598,145                   06/600,232                   07/01/86
4,598,147                   06/676,608                   07/01/86
4,598,155                   06/441,829                   07/01/86
4,598,158                   06/456,978                   07/01/86
4,598,161                   06/481,927                   07/01/86
4,598,166                   06/638,176                   07/01/86
4,598,169                   06/563,979                   07/01/86
4,598,174                   06/670,084                   07/01/86
4,598,181                   06/670,083                   07/01/86
4,598,188                   06/665,714                   07/01/86
4,598,196                   06/629,368                   07/01/86
4,598,197                   06/519,675                   07/01/86
4,598,202                   06/615,336                   07/01/86
4,598,203                   06/663,945                   07/01/86
4,598,208                   06/742,652                   07/01/86
4,598,214                   06/547,524                   07/01/86
4,598,217                   06/591,281                   07/01/86
4,598,224                   06/763,164                   07/01/86
4,598,230                   06/591,743                   07/01/86
4,598,239                   06/566,184                   07/01/86
4,598,253                   06/651,231                   07/01/86
4,598,254                   06/630,240                   07/01/86
4,598,259                   06/678,330                   07/01/86
4,598,261                   06/737,627                   07/01/86
4,598,266                   06/653,411                   07/01/86
4,598,268                   06/506,572                   07/01/86
4,598,272                   06/638,197                   07/01/86
4,598,278                   06/461,081                   07/01/86
4,598,282                   06/478,944                   07/01/86
4,598,283                   06/621,824                   07/01/86
4,598,304                   06/790,781                   07/01/86
4,598,305                   06/621,340                   07/01/86
4,598,308                   06/596,053                   07/01/86
4,598,310                   06/546,685                   07/01/86
4,598,313                   06/666,852                   07/01/86
4,598,316                   06/532,333                   07/01/86
4,598,327                   06/749,694                   07/01/86
4,598,349                   06/646,711                   07/01/86
4,598,354                   06/561,217                   07/01/86
4,598,355                   06/545,901                   07/01/86
4,598,359                   06/481,225                   07/01/86
4,598,362                   06/506,363                   07/01/86
4,598,365                   06/481,224                   07/01/86
4,598,369                   06/490,457                   07/01/86
4,598,380                   06/640,431                   07/01/86
4,598,384                   06/487,660                   07/01/86
4,598,388                   06/693,417                   07/01/86
4,598,389                   06/656,283                   07/01/86
4,598,390                   06/624,489                   07/01/86
4,598,402                   06/549,462                   07/01/86
4,598,404                   06/564,137                   07/01/86
4,598,405                   06/565,567                   07/01/86
4,598,412                   06/700,082                   07/01/86
4,598,414                   06/665,089                   07/01/86
4,935,964                   07/367,797                   06/26/90
4,935,969                   07/260,280                   06/26/90
4,935,970                   07/336,385                   06/26/90
4,935,974                   07/419,251                   06/26/90
4,935,980                   07/367,887                   06/26/90
4,935,983                   07/216,179                   06/26/90
4,935,984                   07/308,045                   06/26/90
4,935,988                   07/372,187                   06/26/90
4,935,991                   07/282,742                   06/26/90
4,935,996                   07/342,860                   06/26/90
4,936,000                   07/327,384                   06/26/90
4,936,002                   07/332,188                   06/26/90
4,936,004                   07/324,984                   06/26/90
4,936,006                   07/317,821                   06/26/90
4,936,021                   07/360,319                   06/26/90
4,936,032                   07/311,315                   06/26/90
4,936,034                   07/338,102                   06/26/90
4,936,037                   07/375,958                   06/26/90
4,936,039                   07/428,924                   06/26/90
4,936,043                   07/355,997                   06/26/90
4,936,047                   07/186,659                   06/26/90
4,936,055                   07/243,926                   06/26/90
4,936,056                   07/291,773                   06/26/90
4,936,060                   07/258,195                   06/26/90
4,936,066                   07/303,161                   06/26/90
4,936,067                   07/367,176                   06/26/90
4,936,068                   07/228,248                   06/26/90
4,936,079                   07/279,827                   06/26/90
4,936,083                   07/382,189                   06/26/90
4,936,084                   07/334,092                   06/26/90
4,936,088                   07/252,778                   06/26/90
4,936,092                   07/276,992                   06/26/90
4,936,093                   07/234,523                   06/26/90
4,936,097                   07/268,063                   06/26/90
4,936,103                   07/371,607                   06/26/90
4,936,104                   07/333,129                   06/26/90
4,936,105                   07/415,105                   06/26/90
4,936,107                   07/268,857                   06/26/90
4,936,108                   07/371,727                   06/26/90
4,936,114                   07/370,876                   06/26/90
4,936,115                   07/194,961                   06/26/90
4,936,117                   06/801,388                   06/26/90
4,936,118                   07/199,240                   06/26/90
4,936,120                   07/336,715                   06/26/90
4,936,121                   07/256,487                   06/26/90
4,936,123                   07/375,427                   06/26/90
4,936,124                   07/382,912                   06/26/90
4,936,125                   07/227,301                   06/26/90
4,936,126                   07/194,969                   06/26/90
4,936,132                   07/180,785                   06/26/90
4,936,134                   07/392,627                   06/26/90
4,936,136                   07/338,085                   06/26/90
4,936,140                   07/146,930                   06/26/90
4,936,142                   07/203,472                   06/26/90
4,936,144                   07/424,115                   06/26/90
4,936,148                   07/258,620                   06/26/90
4,936,152                   07/357,770                   06/26/90
4,936,154                   07/383,049                   06/26/90
4,936,168                   07/468,275                   06/26/90
4,936,171                   07/301,156                   06/26/90
4,936,173                   07/026,485                   06/26/90
4,936,179                   07/102,348                   06/26/90
4,936,180                   07/295,232                   06/26/90
4,936,182                   07/320,939                   06/26/90
4,936,185                   07/136,818                   06/26/90
4,936,187                   07/341,598                   06/26/90
4,936,188                   07/406,931                   06/26/90
4,936,189                   07/414,172                   06/26/90
4,936,190                   07/409,901                   06/26/90
4,936,194                   07/318,695                   06/26/90
4,936,197                   07/383,860                   06/26/90
4,936,202                   07/362,347                   06/26/90
4,936,208                   07/342,404                   06/26/90
4,936,212                   07/345,407                   06/26/90
4,936,214                   07/373,692                   06/26/90
4,936,222                   07/273,196                   06/26/90
4,936,229                   07/357,956                   06/26/90
4,936,231                   07/392,463                   06/26/90
4,936,232                   07/334,889                   06/26/90
4,936,234                   07/347,038                   06/26/90
4,936,242                   07/251,796                   06/26/90
4,936,247                   07/240,698                   06/26/90
4,936,252                   07/180,051                   06/26/90
4,936,265                   07/452,374                   06/26/90
4,936,268                   07/368,256                   06/26/90
4,936,285                   06/752,001                   06/26/90
4,936,286                   07/433,554                   06/26/90
4,936,290                   07/399,913                   06/26/90
4,936,293                   07/357,996                   06/26/90
4,936,296                   07/191,951                   06/26/90
4,936,300                   07/202,541                   06/26/90
4,936,303                   07/123,218                   06/26/90
4,936,308                   07/265,519                   06/26/90
4,936,309                   07/183,475                   06/26/90
4,936,315                   07/260,195                   06/26/90
4,936,322                   07/292,454                   06/26/90
4,936,328                   07/287,024                   06/26/90
4,936,329                   07/345,947                   06/26/90
4,936,331                   07/350,606                   06/26/90
4,936,337                   07/122,630                   06/26/90
4,936,339                   07/379,915                   06/26/90
4,936,341                   07/314,569                   06/26/90
4,936,344                   07/349,363                   06/26/90
4,936,347                   07/421,778                   06/26/90
4,936,351                   07/239,489                   06/26/90
4,936,355                   07/339,068                   06/26/90
4,936,359                   07/216,415                   06/26/90
4,936,360                   07/399,617                   06/26/90
4,936,371                   07/288,914                   06/26/90
4,936,378                   07/356,787                   06/26/90
4,936,392                   07/277,023                   06/26/90
4,936,397                   07/328,890                   06/26/90
4,936,400                   07/355,060                   06/26/90
4,936,401                   07/290,679                   06/26/90
4,936,408                   07/320,329                   06/26/90
4,936,417                   07/368,798                   06/26/90
4,936,420                   07/361,931                   06/26/90
4,936,422                   07/380,917                   06/26/90
4,936,426                   06/750,225                   06/26/90
4,936,427                   07/264,610                   06/26/90
4,936,436                   07/332,160                   06/26/90
4,936,439                   07/219,222                   06/26/90
4,936,441                   07/409,418                   06/26/90
4,936,442                   07/292,368                   06/26/90
4,936,462                   07/413,268                   06/26/90
4,936,463                   07/410,487                   06/26/90
4,936,465                   07/408,392                   06/26/90
4,936,478                   07/280,310                   06/26/90
4,936,479                   07/339,513                   06/26/90
4,936,481                   07/144,560                   06/26/90
4,936,482                   07/335,566                   06/26/90
4,936,487                   07/264,531                   06/26/90
4,936,491                   07/425,260                   06/26/90
4,936,492                   07/301,778                   06/26/90
4,936,495                   07/309,141                   06/26/90
4,936,497                   07/289,045                   06/26/90
4,936,503                   07/355,964                   06/26/90
4,936,506                   07/270,232                   06/26/90
4,936,508                   07/346,525                   06/26/90
4,936,513                   07/139,649                   06/26/90
4,936,519                   06/714,856                   06/26/90
4,936,522                   07/331,502                   06/26/90
4,936,528                   07/192,731                   06/26/90
4,936,536                   07/380,315                   06/26/90
4,936,539                   07/189,230                   06/26/90
4,936,541                   07/354,362                   06/26/90
4,936,542                   07/329,253                   06/26/90
4,936,546                   07/316,755                   06/26/90
4,936,550                   07/422,672                   06/26/90
4,936,554                   07/253,430                   06/26/90
4,936,559                   07/273,024                   06/26/90
4,936,566                   07/238,308                   06/26/90
4,936,571                   07/323,261                   06/26/90
4,936,572                   07/415,704                   06/26/90
4,936,580                   07/419,653                   06/26/90
4,936,581                   07/354,463                   06/26/90
4,936,584                   07/362,362                   06/26/90
4,936,585                   07/428,496                   06/26/90
4,936,588                   07/292,903                   06/26/90
4,936,589                   07/229,277                   06/26/90
4,936,598                   07/331,062                   06/26/90
4,936,601                   07/375,477                   06/26/90
4,936,602                   07/223,924                   06/26/90
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