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 22, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

4,601,067                   06/732,553                   07/22/86
4,601,069                   06/672,623                   07/22/86
4,601,077                   06/722,360                   07/22/86
4,601,083                   06/564,712                   07/22/86
4,601,090                   06/736,126                   07/22/86
4,601,116                   06/734,798                   07/22/86
4,601,124                   06/714,961                   07/22/86
4,601,127                   06/620,939                   07/22/86
4,601,128                   06/690,036                   07/22/86
4,601,133                   06/761,057                   07/22/86
4,601,138                   06/677,979                   07/22/86
4,601,141                   06/620,675                   07/22/86
4,601,143                   06/574,010                   07/22/86
4,601,146                   06/582,207                   07/22/86
4,601,152                   06/605,372                   07/22/86
4,601,163                   06/680,787                   07/22/86
4,601,167                   06/626,211                   07/22/86
4,601,177                   06/748,474                   07/22/86
4,601,179                   06/752,124                   07/22/86
4,601,200                   06/499,518                   07/22/86
4,601,209                   06/722,537                   07/22/86
4,601,213                   06/605,687                   07/22/86
4,601,218                   06/622,733                   07/22/86
4,601,223                   06/631,371                   07/22/86
4,601,225                   06/707,745                   07/22/86
4,601,235                   06/621,832                   07/22/86
4,601,238                   06/661,109                   07/22/86
4,601,239                   06/783,141                   07/22/86
4,601,240                   06/657,650                   07/22/86
4,601,241                   06/695,348                   07/22/86
4,601,243                   06/656,891                   07/22/86
4,601,256                   06/637,448                   07/22/86
4,601,258                   06/653,940                   07/22/86
4,601,263                   06/750,750                   07/22/86
4,601,270                   06/566,001                   07/22/86
4,601,271                   06/687,726                   07/22/86
4,601,273                   06/655,225                   07/22/86
4,601,275                   06/410,611                   07/22/86
4,601,277                   06/624,162                   07/22/86
4,601,279                   06/775,211                   07/22/86
4,601,283                   06/452,377                   07/22/86
4,601,286                   06/602,602                   07/22/86
4,601,287                   06/785,631                   07/22/86
4,601,288                   06/703,963                   07/22/86
4,601,289                   06/719,785                   07/22/86
4,601,290                   06/540,319                   07/22/86
4,601,299                   06/562,681                   07/22/86
4,601,310                   06/452,721                   07/22/86
4,601,311                   06/687,518                   07/22/86
4,601,315                   06/267,333                   07/22/86
4,601,323                   06/712,741                   07/22/86
4,601,326                   06/736,285                   07/22/86
4,601,328                   06/650,526                   07/22/86
4,601,329                   06/528,065                   07/22/86
4,601,331                   06/768,541                   07/22/86
4,601,334                   06/597,852                   07/22/86
4,601,336                   06/651,388                   07/22/86
4,601,337                   06/609,062                   07/22/86
4,601,340                   06/525,911                   07/22/86
4,601,346                   06/650,616                   07/22/86
4,601,353                   06/658,244                   07/22/86
4,601,355                   06/646,089                   07/22/86
4,601,359                   06/743,215                   07/22/86
4,601,365                   06/742,972                   07/22/86
4,601,375                   06/511,283                   07/22/86
4,601,387                   06/649,900                   07/22/86
4,601,388                   06/695,375                   07/22/86
4,601,394                   06/607,872                   07/22/86
4,601,396                   06/674,792                   07/22/86
4,601,406                   06/747,981                   07/22/86
4,601,417                   06/712,529                   07/22/86
4,601,424                   06/735,040                   07/22/86
4,601,439                   06/741,165                   07/22/86
4,601,441                   06/608,358                   07/22/86
4,601,442                   06/545,083                   07/22/86
4,601,448                   06/632,656                   07/22/86
4,601,449                   06/543,598                   07/22/86
4,601,452                   06/659,578                   07/22/86
4,601,454                   06/642,246                   07/22/86
4,601,463                   06/627,468                   07/22/86
4,601,473                   06/656,141                   07/22/86
4,601,479                   06/681,135                   07/22/86
4,601,482                   06/709,135                   07/22/86
4,601,483                   06/640,955                   07/22/86
4,601,489                   06/759,482                   07/22/86
4,601,490                   06/541,784                   07/22/86
4,601,492                   06/435,458                   07/22/86
4,601,493                   06/600,070                   07/22/86
4,601,500                   06/702,559                   07/22/86
4,601,509                   06/697,268                   07/22/86
4,601,517                   06/649,191                   07/22/86
4,601,525                   06/735,505                   07/22/86
4,601,526                   06/771,141                   07/22/86
4,601,532                   06/492,690                   07/22/86
4,601,534                   06/508,499                   07/22/86
4,601,535                   06/715,257                   07/22/86
4,601,536                   06/475,561                   07/22/86
4,601,548                   06/546,517                   07/22/86
4,601,555                   06/642,174                   07/22/86
4,601,568                   06/664,294                   07/22/86
4,601,575                   06/353,505                   07/22/86
4,601,577                   06/534,119                   07/22/86
4,601,587                   06/534,352                   07/22/86
4,601,590                   06/766,740                   07/22/86
4,601,597                   06/608,860                   07/22/86
4,601,610                   06/698,197                   07/22/86
4,601,613                   06/602,078                   07/22/86
4,601,616                   06/711,303                   07/22/86
4,601,617                   06/721,566                   07/22/86
4,601,621                   06/609,417                   07/22/86
4,601,627                   06/585,695                   07/22/86
4,601,648                   06/773,549                   07/22/86
4,601,651                   06/720,303                   07/22/86
4,601,653                   06/772,337                   07/22/86
4,601,656                   06/600,110                   07/22/86
4,601,660                   06/746,052                   07/22/86
4,601,666                   06/700,337                   07/22/86
4,601,669                   06/690,767                   07/22/86
4,601,674                   06/730,677                   07/22/86
4,601,679                   06/734,695                   07/22/86
4,601,685                   06/746,389                   07/22/86
4,601,686                   06/343,442                   07/22/86
4,601,704                   06/546,139                   07/22/86
4,601,721                   06/651,006                   07/22/86
4,601,724                   06/614,633                   07/22/86
4,601,728                   06/732,757                   07/22/86
4,601,729                   06/656,675                   07/22/86
4,601,732                   06/675,466                   07/22/86
4,601,736                   06/668,846                   07/22/86
4,601,737                   06/682,325                   07/22/86
4,601,739                   06/645,658                   07/22/86
4,601,750                   06/750,337                   07/22/86
4,601,759                   06/598,643                   07/22/86
4,601,770                   06/533,651                   07/22/86
4,601,782                   06/747,156                   07/22/86
4,601,786                   06/597,396                   07/22/86
4,601,790                   06/514,905                   07/22/86
4,601,791                   06/755,302                   07/22/86
4,601,801                   06/753,223                   07/22/86
4,601,807                   06/692,143                   07/22/86
4,601,808                   06/731,067                   07/22/86
4,601,812                   06/689,108                   07/22/86
4,601,813                   06/412,321                   07/22/86
4,601,828                   06/688,861                   07/22/86
4,601,829                   06/685,792                   07/22/86
4,601,837                   06/773,173                   07/22/86
4,601,839                   06/320,991                   07/22/86
4,601,843                   06/719,392                   07/22/86
4,601,844                   06/779,310                   07/22/86
4,601,853                   06/697,995                   07/22/86
4,601,858                   06/744,348                   07/22/86
4,601,864                   06/610,493                   07/22/86
4,601,872                   06/600,905                   07/22/86
4,601,874                   06/752,512                   07/22/86
4,601,879                   06/737,976                   07/22/86
4,601,883                   06/741,209                   07/22/86
4,601,884                   06/624,703                   07/22/86
4,601,886                   06/613,565                   07/22/86
4,601,889                   06/546,987                   07/22/86
4,601,897                   06/795,689                   07/22/86
4,601,898                   06/716,491                   07/22/86
4,601,899                   06/716,552                   07/22/86
4,601,901                   06/528,810                   07/22/86
4,601,906                   06/659,527                   07/22/86
4,601,907                   06/730,225                   07/22/86
4,601,918                   06/769,902                   07/22/86
4,601,921                   06/686,081                   07/22/86
4,601,951                   06/557,942                   07/22/86
4,601,957                   06/770,777                   07/22/86
4,601,967                   06/679,054                   07/22/86
4,601,970                   06/756,698                   07/22/86
4,601,977                   06/502,473                   07/22/86
4,601,982                   06/367,334                   07/22/86
4,601,987                   06/706,039                   07/22/86
4,601,992                   06/637,695                   07/22/86
4,601,996                   06/671,139                   07/22/86
4,602,007                   06/651,136                   07/22/86
4,602,009                   06/645,100                   07/22/86
4,602,021                   06/745,456                   07/22/86
4,602,022                   06/673,722                   07/22/86
4,602,025                   06/621,583                   07/22/86
4,602,032                   06/683,378                   07/22/86
4,602,034                   06/669,037                   07/22/86
4,602,037                   06/494,393                   07/22/86
4,602,038                   06/618,596                   07/22/86
4,602,048                   06/799,942                   07/22/86
4,602,050                   06/720,596                   07/22/86
4,602,054                   06/713,168                   07/22/86
4,602,059                   06/605,026                   07/22/86
4,602,064                   06/676,683                   07/22/86
4,602,070                   06/751,159                   07/22/86
4,602,074                   06/682,782                   07/22/86
4,602,084                   06/512,089                   07/22/86
4,602,087                   06/611,819                   07/22/86
4,602,091                   06/573,773                   07/22/86
4,602,095                   06/566,633                   07/22/86
4,602,098                   06/736,905                   07/22/86
4,602,100                   06/661,355                   07/22/86
4,602,103                   06/721,627                   07/22/86
4,602,104                   06/722,094                   07/22/86
4,602,106                   06/713,798                   07/22/86
4,602,110                   06/734,311                   07/22/86
4,602,113                   06/551,336                   07/22/86
4,602,116                   06/721,496                   07/22/86
4,602,136                   06/709,690                   07/22/86
4,602,140                   06/667,463                   07/22/86
4,602,144                   06/651,769                   07/22/86
4,602,146                   06/597,963                   07/22/86
4,602,149                   06/517,380                   07/22/86
4,602,152                   06/497,637                   07/22/86
4,602,159                   06/606,775                   07/22/86
4,602,164                   06/696,834                   07/22/86
4,602,165                   06/704,959                   07/22/86
4,602,166                   06/495,971                   07/22/86
4,602,170                   06/530,450                   07/22/86
4,602,179                   06/677,769                   07/22/86
4,602,180                   06/689,217                   07/22/86
4,602,183                   06/509,755                   07/22/86
4,602,208                   06/717,740                   07/22/86
4,602,216                   06/548,692                   07/22/86
4,602,222                   06/724,977                   07/22/86
4,602,229                   06/567,436                   07/22/86
4,602,230                   06/684,289                   07/22/86
4,602,231                   06/632,813                   07/22/86
4,602,232                   06/732,695                   07/22/86
4,602,238                   06/572,362                   07/22/86
4,602,241                   06/749,858                   07/22/86
4,602,243                   06/489,022                   07/22/86
4,602,263                   06/646,771                   07/22/86
4,602,266                   06/570,565                   07/22/86
4,602,268                   06/333,762                   07/22/86
4,602,284                   06/470,881                   07/22/86
4,602,287                   06/554,154                   07/22/86
4,602,288                   06/554,151                   07/22/86
4,602,294                   06/500,087                   07/22/86
4,602,295                   06/544,910                   07/22/86
4,602,297                   06/710,379                   07/22/86
4,602,302                   06/652,571                   07/22/86
4,602,309                   06/732,316                   07/22/86
4,602,310                   06/715,659                   07/22/86
4,602,311                   06/657,691                   07/22/86
4,602,317                   06/681,412                   07/22/86
4,602,323                   06/667,965                   07/22/86
4,602,332                   06/574,246                   07/22/86
4,602,333                   06/650,855                   07/22/86
4,602,344                   06/664,817                   07/22/86
4,602,346                   06/612,010                   07/22/86
4,602,352                   06/601,230                   07/22/86
4,602,358                   06/639,847                   07/22/86
4,602,368                   06/485,551                   07/22/86
4,602,383                   06/606,074                   07/22/86
4,941,212                   06/405,286                   07/17/90
4,941,215                   07/299,037                   07/17/90
4,941,220                   07/232,030                   07/17/90
4,941,225                   07/436,009                   07/17/90
4,941,226                   07/279,979                   07/17/90
4,941,232                   07/106,247                   07/17/90
4,941,234                   07/409,938                   07/17/90
4,941,237                   07/316,514                   07/17/90
4,941,238                   07/154,988                   07/17/90
4,941,243                   07/387,330                   07/17/90
4,941,246                   07/409,084                   07/17/90
4,941,255                   07/437,145                   07/17/90
4,941,256                   07/381,790                   07/17/90
4,941,260                   07/284,991                   07/17/90
4,941,262                   07/428,615                   07/17/90
4,941,266                   07/314,098                   07/17/90
4,941,267                   07/387,586                   07/17/90
4,941,269                   07/389,201                   07/17/90
4,941,271                   07/230,908                   07/17/90
4,941,273                   07/277,680                   07/17/90
4,941,274                   07/339,056                   07/17/90
4,941,277                   07/271,529                   07/17/90
4,941,280                   07/404,420                   07/17/90
4,941,284                   07/451,186                   07/17/90
4,941,301                   07/412,546                   07/17/90
4,941,308                   07/324,181                   07/17/90
4,941,319                   07/251,593                   07/17/90
4,941,322                   07/208,585                   07/17/90
4,941,324                   07/405,624                   07/17/90
4,941,333                   07/304,968                   07/17/90
4,941,348                   07/329,772                   07/17/90
4,941,349                   07/368,766                   07/17/90
4,941,351                   07/192,710                   07/17/90
4,941,355                   07/222,274                   07/17/90
4,941,356                   07/263,763                   07/17/90
4,941,359                   07/306,005                   07/17/90
4,941,360                   07/366,646                   07/17/90
4,941,361                   07/208,739                   07/17/90
4,941,367                   07/276,244                   07/17/90
4,941,369                   07/334,617                   07/17/90
4,941,370                   07/216,569                   07/17/90
4,941,377                   07/248,682                   07/17/90
4,941,379                   07/364,232                   07/17/90
4,941,386                   07/355,784                   07/17/90
4,941,389                   07/234,487                   07/17/90
4,941,393                   07/405,338                   07/17/90
4,941,396                   07/276,679                   07/17/90
4,941,399                   07/301,922                   07/17/90
4,941,404                   07/272,895                   07/17/90
4,941,407                   07/175,109                   07/17/90
4,941,422                   07/356,769                   07/17/90
4,941,431                   07/284,095                   07/17/90
4,941,433                   07/197,951                   07/17/90
4,941,434                   07/230,865                   07/17/90
4,941,435                   07/370,984                   07/17/90
4,941,442                   07/195,300                   07/17/90
4,941,443                   07/304,064                   07/17/90
4,941,444                   07/313,179                   07/17/90
4,941,447                   07/312,460                   07/17/90
4,941,451                   07/404,677                   07/17/90
4,941,455                   07/407,314                   07/17/90
4,941,459                   07/375,908                   07/17/90
4,941,473                   07/297,256                   07/17/90
4,941,477                   07/279,585                   07/17/90
4,941,478                   07/211,303                   07/17/90
4,941,479                   07/402,914                   07/17/90
4,941,482                   07/225,693                   07/17/90
4,941,491                   07/335,095                   07/17/90
4,941,496                   07/327,694                   07/17/90
4,941,511                   07/170,386                   07/17/90
4,941,520                   07/087,006                   07/17/90
4,941,528                   07/219,659                   07/17/90
4,941,535                   07/297,214                   07/17/90
4,941,537                   07/371,651                   07/17/90
4,941,539                   07/319,127                   07/17/90
4,941,542                   07/363,432                   07/17/90
4,941,546                   07/307,898                   07/17/90
4,941,549                   07/409,204                   07/17/90
4,941,551                   07/354,382                   07/17/90
4,941,563                   07/327,920                   07/17/90
4,941,570                   07/340,215                   07/17/90
4,941,579                   07/336,420                   07/17/90
4,941,583                   07/459,960                   07/17/90
4,941,586                   07/298,091                   07/17/90
4,941,587                   07/359,898                   07/17/90
4,941,590                   07/367,380                   07/17/90
4,941,597                   06/791,599                   07/17/90
4,941,599                   07/284,998                   07/17/90
4,941,604                   07/345,228                   07/17/90
4,941,609                   07/303,438                   07/17/90
4,941,612                   07/395,432                   07/17/90
4,941,620                   07/315,468                   07/17/90
4,941,625                   07/208,036                   07/17/90
4,941,626                   07/427,435                   07/17/90
4,941,630                   07/316,780                   07/17/90
4,941,631                   07/075,900                   07/17/90
4,941,634                   07/295,814                   07/17/90
4,941,640                   07/154,848                   07/17/90
4,941,642                   07/253,263                   07/17/90
4,941,643                   07/303,170                   07/17/90
4,941,668                   07/389,858                   07/17/90
4,941,673                   07/309,216                   07/17/90
4,941,676                   07/426,428                   07/17/90
4,941,690                   07/369,624                   07/17/90
4,941,693                   07/340,086                   07/17/90
4,941,695                   07/353,543                   07/17/90
4,941,697                   07/442,126                   07/17/90
4,941,699                   07/264,332                   07/17/90
4,941,707                   07/242,820                   07/17/90
4,941,708                   07/249,670                   07/17/90
4,941,709                   07/368,361                   07/17/90
4,941,713                   07/348,205                   07/17/90
4,941,725                   07/398,647                   07/17/90
4,941,726                   07/239,158                   07/17/90
4,941,730                   07/193,609                   07/17/90
4,941,740                   07/369,804                   07/17/90
4,941,748                   07/320,025                   07/17/90
4,941,754                   07/358,121                   07/17/90
4,941,755                   07/158,307                   07/17/90
4,941,760                   07/406,103                   07/17/90
4,941,781                   07/447,906                   07/17/90
4,941,783                   07/329,435                   07/17/90
4,941,786                   07/315,934                   07/17/90
4,941,787                   07/417,640                   07/17/90
4,941,799                   07/246,972                   07/17/90
4,941,811                   07/287,362                   07/17/90
4,941,813                   07/283,832                   07/17/90
4,941,818                   07/273,466                   07/17/90
4,941,825                   07/324,860                   07/17/90
4,941,830                   07/227,026                   07/17/90
4,941,831                   06/862,118                   07/17/90
4,941,834                   07/476,692                   07/17/90
4,941,851                   07/394,047                   07/17/90
4,941,855                   07/276,696                   07/17/90
4,941,862                   07/170,944                   07/17/90
4,941,863                   07/329,936                   07/17/90
4,941,864                   07/413,099                   07/17/90
4,941,870                   07/292,554                   07/17/90
4,941,876                   07/143,078                   07/17/90
4,941,885                   07/407,687                   07/17/90
4,941,886                   07/208,059                   07/17/90
4,941,887                   07/147,206                   07/17/90
4,941,904                   07/367,908                   07/17/90
4,941,909                   07/334,952                   07/17/90
4,941,917                   07/358,957                   07/17/90
4,941,918                   07/282,506                   07/17/90
4,941,927                   07/343,778                   07/17/90
4,941,928                   07/292,033                   07/17/90
4,941,932                   07/371,516                   07/17/90
4,941,947                   07/415,831                   07/17/90
4,941,948                   07/195,865                   07/17/90
4,941,954                   07/349,243                   07/17/90
4,941,959                   07/441,494                   07/17/90
4,941,970                   07/207,215                   07/17/90
4,941,972                   06/678,870                   07/17/90
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