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 24, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

4,596,060                   06/634,980                   06/24/86
4,596,065                   06/730,541                   06/24/86
4,596,069                   06/630,485                   06/24/86
4,596,070                   06/630,486                   06/24/86
4,596,082                   06/726,188                   06/24/86
4,596,083                   06/689,600                   06/24/86
4,596,090                   06/605,463                   06/24/86
4,596,092                   06/666,314                   06/24/86
4,596,103                   06/659,407                   06/24/86
4,596,104                   06/784,222                   06/24/86
4,596,107                   06/666,331                   06/24/86
4,596,108                   06/695,735                   06/24/86
4,596,112                   06/647,500                   06/24/86
4,596,113                   06/720,260                   06/24/86
4,596,115                   06/629,324                   06/24/86
4,596,118                   06/678,002                   06/24/86
4,596,120                   06/676,822                   06/24/86
4,596,126                   06/619,127                   06/24/86
4,596,127                   06/531,092                   06/24/86
4,596,130                   06/708,055                   06/24/86
4,596,134                   06/740,162                   06/24/86
4,596,139                   06/695,811                   06/24/86
4,596,140                   06/652,717                   06/24/86
4,596,143                   06/565,865                   06/24/86
4,596,159                   06/543,454                   06/24/86
4,596,169                   06/476,963                   06/24/86
4,596,173                   06/655,035                   06/24/86
4,596,176                   06/505,207                   06/24/86
4,596,177                   06/441,309                   06/24/86
4,596,181                   06/771,641                   06/24/86
4,596,182                   06/577,784                   06/24/86
4,596,190                   06/624,225                   06/24/86
4,596,194                   06/699,740                   06/24/86
4,596,201                   06/608,021                   06/24/86
4,596,202                   06/587,512                   06/24/86
4,596,207                   06/664,098                   06/24/86
4,596,208                   06/667,989                   06/24/86
4,596,209                   06/701,115                   06/24/86
4,596,210                   06/605,030                   06/24/86
4,596,214                   06/692,738                   06/24/86
4,596,216                   06/383,462                   06/24/86
4,596,219                   06/572,921                   06/24/86
4,596,223                   06/590,626                   06/24/86
4,596,224                   06/490,086                   06/24/86
4,596,237                   06/589,347                   06/24/86
4,596,239                   06/721,562                   06/24/86
4,596,244                   06/581,457                   06/24/86
4,596,250                   06/671,410                   06/24/86
4,596,258                   06/611,941                   06/24/86
4,596,262                   06/585,880                   06/24/86
4,596,263                   06/557,839                   06/24/86
4,596,270                   06/736,287                   06/24/86
4,596,285                   06/717,033                   06/24/86
4,596,290                   06/630,041                   06/24/86
4,596,292                   06/724,453                   06/24/86
4,596,293                   06/632,435                   06/24/86
4,596,294                   06/368,993                   06/24/86
4,596,304                   06/660,888                   06/24/86
4,596,310                   06/599,160                   06/24/86
4,596,319                   06/551,350                   06/24/86
4,596,321                   06/703,346                   06/24/86
4,596,322                   06/459,099                   06/24/86
4,596,326                   06/691,315                   06/24/86
4,596,336                   06/634,878                   06/24/86
4,596,337                   06/498,960                   06/24/86
4,596,345                   06/536,932                   06/24/86
4,596,359                   06/738,954                   06/24/86
4,596,361                   06/710,469                   06/24/86
4,596,368                   06/544,261                   06/24/86
4,596,374                   06/676,131                   06/24/86
4,596,376                   06/725,132                   06/24/86
4,596,378                   06/793,232                   06/24/86
4,596,379                   06/393,426                   06/24/86
4,596,380                   06/697,558                   06/24/86
4,596,405                   06/654,242                   06/24/86
4,596,416                   06/770,964                   06/24/86
4,596,422                   06/648,582                   06/24/86
4,596,429                   06/725,075                   06/24/86
4,596,433                   06/761,292                   06/24/86
4,596,436                   06/715,432                   06/24/86
4,596,448                   06/559,536                   06/24/86
4,596,455                   06/650,507                   06/24/86
4,596,456                   06/652,054                   06/24/86
4,596,467                   06/590,135                   06/24/86
4,596,470                   06/686,341                   06/24/86
4,596,474                   06/743,256                   06/24/86
4,596,476                   06/613,971                   06/24/86
4,596,477                   06/696,436                   06/24/86
4,596,479                   06/734,746                   06/24/86
4,596,485                   06/740,810                   06/24/86
4,596,495                   06/704,558                   06/24/86
4,596,496                   06/643,042                   06/24/86
4,596,500                   06/575,829                   06/24/86
4,596,508                   06/503,688                   06/24/86
4,596,510                   06/364,631                   06/24/86
4,596,512                   06/644,002                   06/24/86
4,596,513                   06/690,331                   06/24/86
4,596,514                   06/541,729                   06/24/86
4,596,516                   06/631,156                   06/24/86
4,596,517                   06/696,331                   06/24/86
4,596,526                   06/708,068                   06/24/86
4,596,539                   06/731,275                   06/24/86
4,596,544                   06/645,230                   06/24/86
4,596,550                   06/574,791                   06/24/86
4,596,558                   06/775,997                   06/24/86
4,596,559                   06/667,638                   06/24/86
4,596,561                   06/688,028                   06/24/86
4,596,571                   06/734,363                   06/24/86
4,596,576                   06/782,433                   06/24/86
4,596,586                   06/318,160                   06/24/86
4,596,587                   06/645,756                   06/24/86
4,596,592                   06/729,844                   06/24/86
4,596,608                   06/723,462                   06/24/86
4,596,609                   06/589,520                   06/24/86
4,596,617                   06/647,590                   06/24/86
4,596,618                   06/580,984                   06/24/86
4,596,624                   06/606,214                   06/24/86
4,596,644                   06/752,287                   06/24/86
4,596,647                   06/688,669                   06/24/86
4,596,649                   06/712,355                   06/24/86
4,596,650                   06/590,175                   06/24/86
4,596,655                   06/524,176                   06/24/86
4,596,659                   06/570,322                   06/24/86
4,596,664                   06/691,986                   06/24/86
4,596,675                   06/780,116                   06/24/86
4,596,677                   06/597,765                   06/24/86
4,596,684                   06/525,613                   06/24/86
4,596,686                   06/309,522                   06/24/86
4,596,691                   06/652,557                   06/24/86
4,596,693                   06/776,629                   06/24/86
4,596,697                   06/646,536                   06/24/86
4,596,701                   06/716,725                   06/24/86
4,596,702                   06/683,392                   06/24/86
4,596,706                   06/722,875                   06/24/86
4,596,715                   06/653,401                   06/24/86
4,596,728                   06/697,175                   06/24/86
4,596,730                   06/682,284                   06/24/86
4,596,736                   06/616,871                   06/24/86
4,596,744                   06/696,238                   06/24/86
4,596,748                   06/599,130                   06/24/86
4,596,758                   06/710,374                   06/24/86
4,596,778                   06/511,127                   06/24/86
4,596,788                   06/617,959                   06/24/86
4,596,792                   06/595,636                   06/24/86
4,596,794                   06/686,670                   06/24/86
4,596,797                   06/733,436                   06/24/86
4,596,804                   06/625,000                   06/24/86
4,596,806                   06/622,596                   06/24/86
4,596,808                   06/556,869                   06/24/86
4,596,810                   06/670,970                   06/24/86
4,596,820                   06/680,059                   06/24/86
4,596,842                   06/723,586                   06/24/86
4,596,844                   06/740,837                   06/24/86
4,596,846                   06/523,726                   06/24/86
4,596,850                   06/682,650                   06/24/86
4,596,852                   06/755,210                   06/24/86
4,596,855                   06/678,015                   06/24/86
4,596,857                   06/674,261                   06/24/86
4,596,859                   06/711,928                   06/24/86
4,596,861                   06/736,915                   06/24/86
4,596,869                   06/777,867                   06/24/86
4,596,875                   06/623,430                   06/24/86
4,596,876                   06/532,118                   06/24/86
4,596,883                   06/628,088                   06/24/86
4,596,889                   06/704,152                   06/24/86
4,596,895                   06/785,159                   06/24/86
4,596,909                   06/692,152                   06/24/86
4,596,916                   06/592,113                   06/24/86
4,596,919                   06/644,311                   06/24/86
4,596,924                   06/502,652                   06/24/86
4,596,925                   06/437,091                   06/24/86
4,596,929                   06/553,533                   06/24/86
4,596,930                   06/487,025                   06/24/86
4,596,932                   06/495,371                   06/24/86
4,596,935                   06/601,646                   06/24/86
4,596,940                   06/601,840                   06/24/86
4,596,952                   06/487,354                   06/24/86
4,596,963                   06/630,406                   06/24/86
4,596,966                   06/708,640                   06/24/86
4,596,967                   06/566,761                   06/24/86
4,596,970                   06/685,034                   06/24/86
4,596,971                   06/755,264                   06/24/86
4,596,974                   06/720,913                   06/24/86
4,596,985                   06/555,471                   06/24/86
4,596,987                   06/620,042                   06/24/86
4,596,991                   06/685,714                   06/24/86
4,596,993                   06/676,502                   06/24/86
4,596,999                   06/592,280                   06/24/86
4,597,003                   06/556,832                   06/24/86
4,597,010                   06/765,556                   06/24/86
4,597,012                   06/673,618                   06/24/86
4,597,015                   06/604,976                   06/24/86
4,597,019                   06/590,783                   06/24/86
4,597,022                   06/564,425                   06/24/86
4,597,023                   06/705,768                   06/24/86
4,597,030                   06/697,216                   06/24/86
4,597,033                   06/687,588                   06/24/86
4,597,035                   06/599,209                   06/24/86
4,597,038                   06/634,731                   06/24/86
4,597,041                   06/441,839                   06/24/86
4,597,044                   06/434,345                   06/24/86
4,597,047                   06/724,059                   06/24/86
4,597,048                   06/530,164                   06/24/86
4,597,051                   06/550,664                   06/24/86
4,597,064                   06/518,239                   06/24/86
4,597,075                   06/744,129                   06/24/86
4,597,082                   06/586,863                   06/24/86
4,597,086                   06/631,173                   06/24/86
4,597,104                   06/660,212                   06/24/86
4,933,996                   07/356,468                   06/19/90
4,933,998                   07/227,734                   06/19/90
4,933,999                   07/281,751                   06/19/90
4,934,000                   07/388,677                   06/19/90
4,934,018                   07/234,321                   06/19/90
4,934,023                   07/431,960                   06/19/90
4,934,025                   07/266,619                   06/19/90
4,934,027                   07/308,265                   06/19/90
4,934,028                   07/335,091                   06/19/90
4,934,040                   06/884,000                   06/19/90
4,934,041                   07/225,088                   06/19/90
4,934,053                   07/349,597                   06/19/90
4,934,054                   07/280,449                   06/19/90
4,934,059                   07/312,227                   06/19/90
4,934,063                   07/398,233                   06/19/90
4,934,066                   07/280,161                   06/19/90
4,934,068                   07/350,297                   06/19/90
4,934,069                   07/269,956                   06/19/90
4,934,078                   07/272,224                   06/19/90
4,934,079                   07/241,203                   06/19/90
4,934,083                   07/392,608                   06/19/90
4,934,085                   07/453,884                   06/19/90
4,934,088                   06/699,549                   06/19/90
4,934,091                   07/344,908                   06/19/90
4,934,092                   07/339,993                   06/19/90
4,934,093                   07/308,050                   06/19/90
4,934,096                   07/248,040                   06/19/90
4,934,097                   07/294,565                   06/19/90
4,934,103                   07/255,449                   06/19/90
4,934,118                   07/261,509                   06/19/90
4,934,120                   07/386,209                   06/19/90
4,934,124                   07/311,957                   06/19/90
4,934,125                   07/324,975                   06/19/90
4,934,128                   07/312,915                   06/19/90
4,934,129                   07/254,190                   06/19/90
4,934,133                   07/288,415                   06/19/90
4,934,137                   07/284,214                   06/19/90
4,934,141                   07/305,651                   06/19/90
4,934,149                   07/294,015                   06/19/90
4,934,150                   07/282,536                   06/19/90
4,934,154                   07/304,048                   06/19/90
4,934,158                   07/344,959                   06/19/90
4,934,164                   07/364,390                   06/19/90
4,934,168                   07/354,293                   06/19/90
4,934,169                   07/192,819                   06/19/90
4,934,176                   07/250,920                   06/19/90
4,934,177                   07/213,440                   06/19/90
4,934,181                   07/330,527                   06/19/90
4,934,188                   07/315,747                   06/19/90
4,934,189                   07/430,689                   06/19/90
4,934,193                   07/356,997                   06/19/90
4,934,200                   07/293,291                   06/19/90
4,934,203                   07/294,172                   06/19/90
4,934,205                   07/284,407                   06/19/90
4,934,209                   07/324,126                   06/19/90
4,934,211                   07/244,975                   06/19/90
4,934,218                   07/293,396                   06/19/90
4,934,221                   07/264,339                   06/19/90
4,934,225                   07/148,656                   06/19/90
4,934,228                   07/297,603                   06/19/90
4,934,230                   07/235,957                   06/19/90
4,934,232                   07/188,862                   06/19/90
4,934,237                   07/148,792                   06/19/90
4,934,241                   07/119,375                   06/19/90
4,934,243                   07/339,620                   06/19/90
4,934,244                   07/405,869                   06/19/90
4,934,246                   07/251,271                   06/19/90
4,934,247                   07/347,512                   06/19/90
4,934,250                   07/293,774                   06/19/90
4,934,259                   07/391,180                   06/19/90
4,934,265                   07/147,168                   06/19/90
4,934,266                   07/301,649                   06/19/90
4,934,268                   07/305,337                   06/19/90
4,934,273                   07/368,603                   06/19/90
4,934,276                   06/842,756                   06/19/90
4,934,281                   07/265,340                   06/19/90
4,934,283                   07/404,790                   06/19/90
4,934,291                   07/353,741                   06/19/90
4,934,292                   07/235,147                   06/19/90
4,934,294                   07/349,750                   06/19/90
4,934,296                   07/347,347                   06/19/90
4,934,301                   07/287,827                   06/19/90
4,934,302                   07/307,351                   06/19/90
4,934,304                   07/331,188                   06/19/90
4,934,309                   07/407,163                   06/19/90
4,934,310                   07/027,106                   06/19/90
4,934,312                   07/232,141                   06/19/90
4,934,313                   07/208,077                   06/19/90
4,934,317                   07/305,754                   06/19/90
4,934,318                   07/308,053                   06/19/90
4,934,319                   07/334,466                   06/19/90
4,934,320                   07/271,996                   06/19/90
4,934,324                   07/294,418                   06/19/90
4,934,327                   07/237,039                   06/19/90
4,934,334                   07/293,376                   06/19/90
4,934,336                   07/358,396                   06/19/90
4,934,339                   07/356,996                   06/19/90
4,934,346                   07/377,109                   06/19/90
4,934,348                   07/366,139                   06/19/90
4,934,353                   07/415,613                   06/19/90
4,934,359                   07/251,044                   06/19/90
4,934,360                   07/294,052                   06/19/90
4,934,365                   07/213,736                   06/19/90
4,934,367                   07/184,903                   06/19/90
4,934,368                   07/146,454                   06/19/90
4,934,384                   07/419,898                   06/19/90
4,934,390                   07/286,103                   06/19/90
4,934,393                   07/213,322                   06/19/90
4,934,400                   07/298,373                   06/19/90
4,934,404                   07/398,970                   06/19/90
4,934,408                   07/318,342                   06/19/90
4,934,409                   07/459,847                   06/19/90
4,934,413                   07/340,601                   06/19/90
4,934,415                   07/255,647                   06/19/90
4,934,416                   07/277,325                   06/19/90
4,934,418                   07/201,920                   06/19/90
4,934,419                   07/277,805                   06/19/90
4,934,421                   07/387,763                   06/19/90
4,934,438                   07/208,723                   06/19/90
4,934,439                   07/361,553                   06/19/90
4,934,444                   07/267,012                   06/19/90
4,934,446                   06/660,189                   06/19/90
4,934,448                   07/305,773                   06/19/90
4,934,466                   07/314,556                   06/19/90
4,934,470                   07/358,302                   06/19/90
4,934,471                   07/131,741                   06/19/90
4,934,484                   07/390,114                   06/19/90
4,934,486                   07/342,308                   06/19/90
4,934,495                   07/330,003                   06/19/90
4,934,506                   07/407,504                   06/19/90
4,934,509                   07/269,909                   06/19/90
4,934,514                   07/342,592                   06/19/90
4,934,516                   07/240,742                   06/19/90
4,934,521                   07/397,657                   06/19/90
4,934,522                   07/419,023                   06/19/90
4,934,526                   07/343,864                   06/19/90
4,934,527                   07/323,889                   06/19/90
4,934,532                   07/241,333                   06/19/90
4,934,533                   07/241,743                   06/19/90
4,934,553                   07/332,537                   06/19/90
4,934,554                   07/244,118                   06/19/90
4,934,558                   07/402,630                   06/19/90
4,934,586                   07/399,059                   06/19/90
4,934,588                   07/260,235                   06/19/90
4,934,606                   07/118,329                   06/19/90
4,934,608                   07/360,978                   06/19/90
4,934,609                   06/662,681                   06/19/90
4,934,625                   07/358,586                   06/19/90
4,934,626                   07/361,924                   06/19/90
4,934,631                   07/294,214                   06/19/90
4,934,643                   07/334,614                   06/19/90
4,934,646                   07/284,900                   06/19/90
4,934,649                   07/277,657                   06/19/90
4,934,651                   07/429,320                   06/19/90
4,934,655                   07/320,692                   06/19/90
4,934,659                   07/322,167                   06/19/90
4,934,665                   07/344,324                   06/19/90
4,934,669                   07/376,587                   06/19/90
4,934,670                   07/393,224                   06/19/90
4,934,674                   07/327,517                   06/19/90
4,934,675                   07/342,126                   06/19/90
4,934,678                   07/382,103                   06/19/90
4,934,679                   07/236,888                   06/19/90
4,934,687                   07/142,736                   06/19/90
4,934,688                   07/468,056                   06/19/90
4,934,690                   07/351,846                   06/19/90
4,934,691                   07/255,333                   06/19/90
4,934,694                   07/166,031                   06/19/90
4,934,695                   07/336,662                   06/19/90
4,934,696                   07/268,045                   06/19/90
4,934,702                   07/279,564                   06/19/90
4,934,704                   07/345,459                   06/19/90
4,934,705                   07/332,585                   06/19/90
4,934,706                   07/448,784                   06/19/90
4,934,708                   07/387,838                   06/19/90
4,934,713                   07/351,574                   06/19/90
4,934,719                   07/420,738                   06/19/90
4,934,725                   07/319,337                   06/19/90
4,934,728                   07/397,668                   06/19/90
4,934,730                   07/304,077                   06/19/90
4,934,750                   07/302,385                   06/19/90
4,934,752                   07/325,182                   06/19/90
4,934,753                   07/253,660                   06/19/90
4,934,754                   07/352,762                   06/19/90
4,934,755                   07/317,736                   06/19/90
4,934,757                   07/322,951                   06/19/90
4,934,761                   07/316,423                   06/19/90
4,934,778                   07/265,386                   06/19/90
4,934,787                   07/386,880                   06/19/90
4,934,795                   07/283,115                   06/19/90
4,934,801                   06/676,295                   06/19/90
4,934,805                   07/262,312                   06/19/90
4,934,813                   07/369,772                   06/19/90
4,934,814                   07/209,645                   06/19/90
4,934,815                   07/217,775                   06/19/90
4,934,827                   07/219,973                   06/19/90
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