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 October 22, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,123                  07/110,375                   12/05/89
(4,548,449)                (06/567,186)                (10/22/85)
Re. 34,157                  07/774,024                   01/05/93
(4,874,604)                (07/213,566)                (10/17/89)
Re. 34,321                  07/776,083                   07/20/93
(4,874,357)                (07/329,294)                (10/17/89)
4,547,909                   06/552,999                   10/22/85
4,547,911                   06/557,592                   10/22/85
4,547,931                   06/538,782                   10/22/85
4,547,937                   06/529,501                   10/22/85
4,547,939                   06/599,222                   10/22/85
4,547,942                   06/483,439                   10/22/85
4,547,951                   06/484,704                   10/22/85
4,547,952                   06/564,608                   10/22/85
4,547,955                   06/380,814                   10/22/85
4,547,956                   06/479,579                   10/22/85
4,547,959                   06/468,149                   10/22/85
4,547,964                   06/519,171                   10/22/85
4,547,968                   06/608,647                   10/22/85
4,547,970                   06/637,309                   10/22/85
4,547,972                   06/527,907                   10/22/85
4,547,981                   06/604,674                   10/22/85
4,547,982                   06/459,106                   10/22/85
4,547,987                   06/598,981                   10/22/85
4,547,994                   06/561,247                   10/22/85
4,547,997                   06/609,309                   10/22/85
4,548,006                   06/650,582                   10/22/85
4,548,011                   06/555,440                   10/22/85
4,548,012                   06/570,422                   10/22/85
4,548,017                   06/573,148                   10/22/85
4,548,021                   06/501,008                   10/22/85
4,548,023                   06/223,931                   10/22/85
4,548,029                   06/545,966                   10/22/85
4,548,033                   06/608,354                   10/22/85
4,548,042                   06/596,256                   10/22/85
4,548,045                   06/595,077                   10/22/85
4,548,049                   06/638,972                   10/22/85
4,548,057                   06/457,369                   10/22/85
4,548,062                   06/433,657                   10/22/85
4,548,070                   06/540,688                   10/22/85
4,548,078                   06/634,088                   10/22/85
4,548,088                   06/562,396                   10/22/85
4,548,092                   06/465,635                   10/22/85
4,548,101                   06/465,796                   10/22/85
4,548,103                   06/249,946                   10/22/85
4,548,106                   06/593,263                   10/22/85
4,548,111                   06/636,935                   10/22/85
4,548,112                   06/632,941                   10/22/85
4,548,116                   06/513,014                   10/22/85
4,548,119                   06/451,880                   10/22/85
4,548,124                   06/581,624                   10/22/85
4,548,132                   06/507,171                   10/22/85
4,548,133                   06/637,322                   10/22/85
4,548,134                   06/580,392                   10/22/85
4,548,138                   06/613,267                   10/22/85
4,548,143                   06/566,656                   10/22/85
4,548,145                   06/635,127                   10/22/85
4,548,149                   06/548,655                   10/22/85
4,548,154                   06/628,468                   10/22/85
4,548,156                   06/570,242                   10/22/85
4,548,164                   06/696,094                   10/22/85
4,548,166                   06/689,467                   10/22/85
4,548,167                   06/645,164                   10/22/85
4,548,168                   06/596,668                   10/22/85
4,548,182                   06/598,797                   10/22/85
4,548,196                   06/428,923                   10/22/85
4,548,205                   06/436,953                   10/22/85
4,548,219                   06/475,234                   10/22/85
4,548,221                   06/575,053                   10/22/85
4,548,222                   06/577,820                   10/22/85
4,548,248                   06/583,865                   10/22/85
4,548,253                   06/525,992                   10/22/85
4,548,257                   06/617,760                   10/22/85
4,548,260                   06/474,521                   10/22/85
4,548,262                   06/654,236                   10/22/85
4,548,263                   06/589,356                   10/22/85
4,548,265                   06/514,013                   10/22/85
4,548,267                   06/556,205                   10/22/85
4,548,270                   06/539,518                   10/22/85
4,548,274                   06/548,958                   10/22/85
4,548,287                   06/518,632                   10/22/85
4,548,297                   06/550,277                   10/22/85
4,548,299                   06/486,970                   10/22/85
4,548,301                   06/552,494                   10/22/85
4,548,302                   06/556,519                   10/22/85
4,548,306                   06/605,246                   10/22/85
4,548,313                   06/495,470                   10/22/85
4,548,329                   06/641,392                   10/22/85
4,548,332                   06/688,002                   10/22/85
4,548,333                   06/676,871                   10/22/85
4,548,337                   06/501,278                   10/22/85
4,548,338                   06/545,536                   10/22/85
4,548,339                   06/598,032                   10/22/85
4,548,343                   06/510,916                   10/22/85
4,548,354                   06/593,386                   10/22/85
4,548,359                   06/500,527                   10/22/85
4,548,360                   06/613,741                   10/22/85
4,548,368                   06/526,476                   10/22/85
4,548,383                   06/582,741                   10/22/85
4,548,386                   06/523,633                   10/22/85
4,548,392                   06/494,784                   10/22/85
4,548,393                   06/569,415                   10/22/85
4,548,401                   06/507,911                   10/22/85
4,548,404                   06/595,925                   10/22/85
4,548,407                   06/480,583                   10/22/85
4,548,415                   06/565,580                   10/22/85
4,548,418                   06/505,988                   10/22/85
4,548,421                   06/516,127                   10/22/85
4,548,424                   06/541,600                   10/22/85
4,548,425                   06/563,130                   10/22/85
4,548,427                   06/313,161                   10/22/85
4,548,437                   06/620,625                   10/22/85
4,548,447                   06/597,244                   10/22/85
4,548,450                   06/614,500                   10/22/85
4,548,452                   06/509,003                   10/22/85
4,548,454                   06/450,297                   10/22/85
4,548,456                   06/451,905                   10/22/85
4,548,461                   06/562,937                   10/22/85
4,548,463                   06/579,635                   10/22/85
4,548,469                   06/618,160                   10/22/85
4,548,471                   06/541,534                   10/22/85
4,548,473                   06/493,850                   10/22/85
4,548,475                   06/559,762                   10/22/85
4,548,479                   06/481,438                   10/22/85
4,548,480                   06/459,242                   10/22/85
4,548,491                   06/513,882                   10/22/85
4,548,497                   06/422,635                   10/22/85
4,548,499                   06/470,282                   10/22/85
4,548,501                   06/395,524                   10/22/85
4,548,505                   06/369,767                   10/22/85
4,548,508                   06/569,475                   10/22/85
4,548,512                   06/543,033                   10/22/85
4,548,514                   06/584,339                   10/22/85
4,548,518                   06/563,565                   10/22/85
4,548,534                   06/481,276                   10/22/85
4,548,536                   06/442,659                   10/22/85
4,548,539                   06/564,528                   10/22/85
4,548,553                   06/653,605                   10/22/85
4,548,557                   06/504,992                   10/22/85
4,548,566                   06/613,083                   10/22/85
4,548,567                   06/437,310                   10/22/85
4,548,575                   06/620,264                   10/22/85
4,548,577                   06/485,618                   10/22/85
4,548,580                   06/445,439                   10/22/85
4,548,581                   06/608,396                   10/22/85
4,548,585                   06/574,006                   10/22/85
4,548,616                   06/620,656                   10/22/85
4,548,617                   06/522,736                   10/22/85
4,548,618                   06/518,587                   10/22/85
4,548,619                   06/659,925                   10/22/85
4,548,632                   06/660,486                   10/22/85
4,548,642                   06/593,941                   10/22/85
4,548,647                   06/607,339                   10/22/85
4,548,651                   06/682,818                   10/22/85
4,548,652                   06/674,942                   10/22/85
4,548,657                   06/387,829                   10/22/85
4,548,662                   06/693,707                   10/22/85
4,548,668                   06/456,959                   10/22/85
4,548,685                   06/643,451                   10/22/85
4,548,691                   06/584,639                   10/22/85
4,548,700                   06/561,475                   10/22/85
4,548,701                   06/563,113                   10/22/85
4,548,702                   06/583,320                   10/22/85
4,548,705                   06/645,920                   10/22/85
4,548,714                   06/540,489                   10/22/85
4,548,715                   06/298,975                   10/22/85
4,548,716                   06/634,304                   10/22/85
4,548,719                   06/483,648                   10/22/85
4,548,722                   06/670,520                   10/22/85
4,548,723                   06/656,042                   10/22/85
4,548,729                   06/601,475                   10/22/85
4,548,731                   06/494,032                   10/22/85
4,548,732                   06/601,538                   10/22/85
4,548,734                   06/460,772                   10/22/85
4,548,735                   06/454,241                   10/22/85
4,548,737                   06/597,389                   10/22/85
4,548,752                   06/535,252                   10/22/85
4,548,762                   06/463,993                   10/22/85
4,548,764                   06/636,227                   10/22/85
4,548,771                   06/574,829                   10/22/85
4,548,790                   06/517,475                   10/22/85
4,548,816                   06/623,177                   10/22/85
4,548,820                   06/516,946                   10/22/85
4,548,823                   06/589,628                   10/22/85
4,548,824                   06/490,972                   10/22/85
4,548,828                   06/636,993                   10/22/85
4,548,830                   06/568,092                   10/22/85
4,548,837                   06/515,057                   10/22/85
4,548,852                   06/490,971                   10/22/85
4,548,865                   06/690,704                   10/22/85
4,548,868                   06/688,425                   10/22/85
4,548,874                   06/676,340                   10/22/85
4,548,877                   06/612,951                   10/22/85
4,548,879                   06/612,184                   10/22/85
4,548,884                   06/612,862                   10/22/85
4,548,885                   06/664,427                   10/22/85
4,548,893                   06/609,163                   10/22/85
4,548,895                   06/586,897                   10/22/85
4,548,897                   06/615,615                   10/22/85
4,548,899                   06/667,465                   10/22/85
4,548,900                   06/496,506                   10/22/85
4,548,904                   06/446,579                   10/22/85
4,548,909                   06/395,078                   10/22/85
4,548,911                   06/661,945                   10/22/85
4,548,912                   06/494,609                   10/22/85
4,548,922                   06/501,187                   10/22/85
4,548,926                   06/618,127                   10/22/85
4,548,932                   06/637,620                   10/22/85
4,548,938                   06/703,233                   10/22/85
4,548,939                   06/656,561                   10/22/85
4,548,943                   06/609,313                   10/22/85
4,548,945                   06/534,233                   10/22/85
4,548,950                   06/501,396                   10/22/85
4,548,955                   06/704,884                   10/22/85
4,548,958                   06/664,913                   10/22/85
4,548,962                   06/611,518                   10/22/85
4,548,964                   06/679,639                   10/22/85
4,548,969                   06/497,313                   10/22/85
4,548,974                   06/513,513                   10/22/85
4,548,975                   06/535,688                   10/22/85
4,548,980                   06/632,830                   10/22/85
4,548,982                   06/528,922                   10/22/85
4,548,995                   06/651,621                   10/22/85
4,549,003                   06/664,917                   10/22/85
4,549,005                   06/658,969                   10/22/85
4,549,009                   06/612,750                   10/22/85
4,549,010                   06/625,166                   10/22/85
4,549,017                   06/535,010                   10/22/85
4,549,025                   06/680,825                   10/22/85
4,549,028                   06/552,288                   10/22/85
4,549,032                   06/613,595                   10/22/85
4,549,033                   06/536,268                   10/22/85
4,549,039                   06/503,359                   10/22/85
4,549,043                   06/568,020                   10/22/85
4,549,044                   06/539,568                   10/22/85
4,549,048                   06/581,220                   10/22/85
4,549,053                   06/472,485                   10/22/85
4,549,054                   06/541,912                   10/22/85
4,549,057                   06/664,371                   10/22/85
4,549,061                   06/472,373                   10/22/85
4,549,079                   06/453,935                   10/22/85
4,549,083                   06/496,627                   10/22/85
4,549,084                   06/451,900                   10/22/85
4,549,087                   06/451,921                   10/22/85
4,549,105                   06/569,140                   10/22/85
4,549,108                   06/497,464                   10/22/85
4,549,110                   06/566,849                   10/22/85
4,549,118                   06/595,127                   10/22/85
4,549,120                   06/515,224                   10/22/85
4,549,125                   06/614,973                   10/22/85
4,549,130                   06/513,205                   10/22/85
4,549,131                   06/451,834                   10/22/85
4,549,134                   06/648,902                   10/22/85
4,549,141                   06/427,696                   10/22/85
4,549,144                   06/528,285                   10/22/85
4,549,147                   06/480,927                   10/22/85
4,549,150                   06/439,162                   10/22/85
4,549,153                   06/528,949                   10/22/85
4,549,156                   06/363,888                   10/22/85
4,549,164                   06/358,442                   10/22/85
4,549,166                   06/361,437                   10/22/85
4,549,169                   06/447,302                   10/22/85
4,549,175                   06/433,193                   10/22/85
4,549,176                   06/481,385                   10/22/85
4,549,182                   06/424,781                   10/22/85
4,549,186                   06/368,370                   10/22/85
4,549,189                   06/500,291                   10/22/85
4,549,197                   06/395,416                   10/22/85
4,549,201                   06/546,538                   10/22/85
4,549,208                   06/563,789                   10/22/85
4,549,212                   06/522,278                   10/22/85
4,549,220                   06/471,111                   10/22/85
4,549,222                   06/471,349                   10/22/85
4,549,223                   06/548,490                   10/22/85
4,549,224                   06/487,802                   10/22/85
4,549,225                   06/310,131                   10/22/85
4,549,230                   06/564,891                   10/22/85
4,549,233                   06/507,068                   10/22/85
4,549,242                   06/385,871                   10/22/85
4,549,246                   06/626,671                   10/22/85
4,549,250                   06/666,386                   10/22/85
4,549,256                   06/541,258                   10/22/85
4,549,266                   06/555,263                   10/22/85
4,549,271                   06/464,495                   10/22/85
4,549,273                   06/448,448                   10/22/85
4,549,275                   06/510,343                   10/22/85
4,549,282                   06/558,476                   10/22/85
4,549,284                   06/473,866                   10/22/85
4,549,295                   06/506,552                   10/22/85
4,549,297                   06/472,466                   10/22/85
4,549,299                   06/475,276                   10/22/85
4,549,300                   06/477,856                   10/22/85
4,549,303                   06/565,806                   10/22/85
4,549,306                   06/718,821                   10/22/85
4,873,727                   07/050,489                   10/17/89
4,873,730                   06/787,040                   10/17/89
4,873,732                   07/261,260                   10/17/89
4,873,735                   07/077,371                   10/17/89
4,873,741                   07/032,744                   10/17/89
4,873,744                   07/167,699                   10/17/89
4,873,759                   07/198,218                   10/17/89
4,873,760                   07/139,270                   10/17/89
4,873,763                   07/266,347                   10/17/89
4,873,767                   07/209,017                   10/17/89
4,873,768                   07/039,408                   10/17/89
4,873,772                   06/880,176                   10/17/89
4,873,774                   07/162,588                   10/17/89
4,873,779                   07/311,603                   10/17/89
4,873,781                   07/215,569                   10/17/89
4,873,782                   07/215,721                   10/17/89
4,873,788                   07/211,040                   10/17/89
4,873,794                   06/865,323                   10/17/89
4,873,795                   07/266,395                   10/17/89
4,873,796                   07/199,601                   10/17/89
4,873,797                   07/201,048                   10/17/89
4,873,798                   07/271,104                   10/17/89
4,873,806                   07/270,075                   10/17/89
4,873,816                   07/142,801                   10/17/89
4,873,826                   07/291,190                   10/17/89
4,873,827                   07/251,177                   10/17/89
4,873,828                   06/846,338                   10/17/89
4,873,834                   07/180,205                   10/17/89
4,873,837                   07/252,474                   10/17/89
4,873,839                   07/255,436                   10/17/89
4,873,841                   07/331,796                   10/17/89
4,873,843                   07/220,269                   10/17/89
4,873,852                   07/264,361                   10/17/89
4,873,856                   07/213,362                   10/17/89
4,873,863                   07/277,314                   10/17/89
4,873,866                   07/033,771                   10/17/89
4,873,868                   07/162,329                   10/17/89
4,873,869                   06/411,731                   10/17/89
4,873,870                   07/145,373                   10/17/89
4,873,872                   07/148,011                   10/17/89
4,873,877                   07/085,659                   10/17/89
4,873,880                   07/176,549                   10/17/89
4,873,891                   07/286,090                   10/17/89
4,873,893                   07/189,035                   10/17/89
4,873,898                   07/299,777                   10/17/89
4,873,899                   07/134,882                   10/17/89
4,873,900                   06/944,470                   10/17/89
4,873,904                   07/184,602                   10/17/89
4,873,905                   07/194,872                   10/17/89
4,873,908                   07/227,143                   10/17/89
4,873,913                   06/906,741                   10/17/89
4,873,914                   07/152,367                   10/17/89
4,873,916                   07/155,554                   10/17/89
4,873,917                   07/259,195                   10/17/89
4,873,918                   07/234,515                   10/17/89
4,873,920                   07/205,348                   10/17/89
4,873,921                   07/219,557                   10/17/89
4,873,927                   07/277,272                   10/17/89
4,873,928                   07/062,020                   10/17/89
4,873,929                   07/034,388                   10/17/89
4,873,933                   07/264,885                   10/17/89
4,873,936                   07/265,404                   10/17/89
4,873,952                   07/161,013                   10/17/89
4,873,957                   07/294,640                   10/17/89
4,873,960                   07/214,484                   10/17/89
4,873,962                   07/191,875                   10/17/89
4,873,964                   07/257,689                   10/17/89
4,873,968                   07/234,648                   10/17/89
4,873,975                   07/132,599                   10/17/89
4,873,984                   06/869,502                   10/17/89
4,873,986                   07/186,894                   10/17/89
4,873,987                   07/213,358                   10/17/89
4,873,988                   07/194,463                   10/17/89
4,874,003                   06/562,460                   10/17/89
4,874,011                   07/296,223                   10/17/89
4,874,015                   07/294,758                   10/17/89
4,874,022                   07/195,781                   10/17/89
4,874,023                   07/251,267                   10/17/89
4,874,025                   07/194,196                   10/17/89
4,874,033                   07/124,611                   10/17/89
4,874,036                   07/218,987                   10/17/89
4,874,040                   07/214,427                   10/17/89
4,874,041                   07/109,874                   10/17/89
4,874,047                   07/222,139                   10/17/89
4,874,049                   07/306,814                   10/17/89
4,874,054                   07/089,552                   10/17/89
4,874,058                   07/222,276                   10/17/89
4,874,060                   07/046,644                   10/17/89
4,874,062                   07/240,935                   10/17/89
4,874,063                   07/263,676                   10/17/89
4,874,076                   07/273,174                   10/17/89
4,874,077                   07/180,443                   10/17/89
4,874,078                   07/201,575                   10/17/89
4,874,079                   07/153,311                   10/17/89
4,874,082                   07/257,504                   10/17/89
4,874,087                   07/169,739                   10/17/89
4,874,096                   07/215,153                   10/17/89
4,874,101                   07/201,329                   10/17/89
4,874,102                   07/265,178                   10/17/89
4,874,106                   07/241,378                   10/17/89
4,874,107                   07/173,490                   10/17/89
4,874,114                   07/269,349                   10/17/89
4,874,121                   07/189,521                   10/17/89
4,874,123                   07/272,348                   10/17/89
4,874,129                   07/213,738                   10/17/89
4,874,133                   07/259,410                   10/17/89
4,874,143                   07/204,564                   10/17/89
4,874,144                   07/098,957                   10/17/89
4,874,146                   07/256,679                   10/17/89
4,874,147                   07/181,677                   10/17/89
4,874,152                   07/180,906                   10/17/89
4,874,154                   07/316,549                   10/17/89
4,874,157                   07/180,520                   10/17/89
4,874,161                   07/124,955                   10/17/89
4,874,164                   06/886,796                   10/17/89
4,874,167                   07/253,571                   10/17/89
4,874,177                   06/615,284                   10/17/89
4,874,178                   07/296,605                   10/17/89
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