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 January 7, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number             Serial Number                Issue Date

Re. 33,068                  07/141,193                   09/26/89
(4,562,788)                (06/634,227)                (01/07/86)
Re. 34,561                  07/816,028                   03/15/94
(4,890,573)                (07/223,630)                (01/02/90)
4,562,602                   06/644,637                   01/07/86
4,562,622                   06/505,964                   01/07/86
4,562,623                   06/504,381                   01/07/86
4,562,624                   06/442,462                   01/07/86
4,562,625                   06/564,239                   01/07/86
4,562,626                   06/534,903                   01/07/86
4,562,627                   06/575,801                   01/07/86
4,562,639                   06/649,629                   01/07/86
4,562,646                   06/664,166                   01/07/86
4,562,649                   06/706,781                   01/07/86
4,562,655                   06/737,796                   01/07/86
4,562,662                   06/661,706                   01/07/86
4,562,669                   06/513,253                   01/07/86
4,562,671                   06/583,579                   01/07/86
4,562,672                   06/511,875                   01/07/86
4,562,674                   06/435,063                   01/07/86
4,562,678                   06/573,969                   01/07/86
4,562,682                   06/532,530                   01/07/86
4,562,684                   06/520,245                   01/07/86
4,562,693                   06/525,554                   01/07/86
4,562,694                   06/511,703                   01/07/86
4,562,698                   06/542,336                   01/07/86
4,562,702                   06/668,872                   01/07/86
4,562,710                   06/545,389                   01/07/86
4,562,714                   06/550,991                   01/07/86
4,562,719                   06/705,357                   01/07/86
4,562,723                   06/635,324                   01/07/86
4,562,726                   06/626,631                   01/07/86
4,562,727                   06/673,645                   01/07/86
4,562,728                   06/677,764                   01/07/86
4,562,734                   06/511,384                   01/07/86
4,562,735                   06/538,103                   01/07/86
4,562,740                   06/602,251                   01/07/86
4,562,750                   06/322,341                   01/07/86
4,562,754                   06/470,384                   01/07/86
4,562,758                   06/586,367                   01/07/86
4,562,759                   06/576,276                   01/07/86
4,562,764                   06/618,468                   01/07/86
4,562,769                   06/565,494                   01/07/86
4,562,776                   06/643,240                   01/07/86
4,562,790                   06/638,629                   01/07/86
4,562,794                   06/575,002                   01/07/86
4,562,795                   06/632,445                   01/07/86
4,562,800                   06/623,557                   01/07/86
4,562,803                   06/556,941                   01/07/86
4,562,804                   06/542,584                   01/07/86
4,562,805                   06/556,910                   01/07/86
4,562,811                   06/540,343                   01/07/86
4,562,815                   06/577,501                   01/07/86
4,562,819                   06/479,133                   01/07/86
4,562,822                   06/451,288                   01/07/86
4,562,827                   06/674,106                   01/07/86
4,562,862                   06/562,202                   01/07/86
4,562,863                   06/574,395                   01/07/86
4,562,864                   06/547,923                   01/07/86
4,562,871                   06/590,337                   01/07/86
4,562,873                   06/584,095                   01/07/86
4,562,877                   06/684,834                   01/07/86
4,562,886                   06/504,055                   01/07/86
4,562,888                   06/570,183                   01/07/86
4,562,893                   06/563,221                   01/07/86
4,562,895                   06/597,420                   01/07/86
4,562,897                   06/545,199                   01/07/86
4,562,903                   06/547,844                   01/07/86
4,562,906                   06/487,967                   01/07/86
4,562,915                   06/225,445                   01/07/86
4,562,924                   06/663,952                   01/07/86
4,562,928                   06/653,882                   01/07/86
4,562,929                   06/481,341                   01/07/86
4,562,940                   06/509,650                   01/07/86
4,562,942                   06/658,274                   01/07/86
4,562,945                   06/655,296                   01/07/86
4,562,949                   06/623,975                   01/07/86
4,562,955                   06/604,088                   01/07/86
4,562,959                   06/225,450                   01/07/86
4,562,969                   06/586,454                   01/07/86
4,562,970                   06/572,706                   01/07/86
4,562,985                   06/643,832                   01/07/86
4,562,986                   06/601,852                   01/07/86
4,562,989                   06/657,111                   01/07/86
4,562,996                   06/531,652                   01/07/86
4,563,013                   06/591,516                   01/07/86
4,563,021                   06/495,341                   01/07/86
4,563,025                   06/509,873                   01/07/86
4,563,028                   06/508,924                   01/07/86
4,563,030                   06/547,584                   01/07/86
4,563,031                   06/652,114                   01/07/86
4,563,035                   06/596,616                   01/07/86
4,563,038                   06/518,011                   01/07/86
4,563,040                   06/434,640                   01/07/86
4,563,041                   06/551,914                   01/07/86
4,563,043                   06/567,267                   01/07/86
4,563,054                   06/528,762                   01/07/86
4,563,058                   06/625,496                   01/07/86
4,563,060                   06/627,294                   01/07/86
4,563,066                   06/539,718                   01/07/86
4,563,067                   06/515,164                   01/07/86
4,563,073                   06/666,713                   01/07/86
4,563,078                   06/645,962                   01/07/86
4,563,083                   06/594,243                   01/07/86
4,563,093                   06/452,326                   01/07/86
4,563,095                   06/451,632                   01/07/86
4,563,096                   06/339,443                   01/07/86
4,563,100                   06/674,079                   01/07/86
4,563,101                   06/649,988                   01/07/86
4,563,107                   06/494,444                   01/07/86
4,563,108                   06/734,751                   01/07/86
4,563,109                   06/579,025                   01/07/86
4,563,121                   06/468,126                   01/07/86
4,563,128                   06/581,198                   01/07/86
4,563,138                   06/664,081                   01/07/86
4,563,140                   06/551,096                   01/07/86
4,563,141                   06/590,261                   01/07/86
4,563,150                   06/577,859                   01/07/86
4,563,153                   06/556,025                   01/07/86
4,563,173                   06/486,600                   01/07/86
4,563,178                   06/698,814                   01/07/86
4,563,196                   06/591,201                   01/07/86
4,563,201                   06/631,686                   01/07/86
4,563,203                   06/601,013                   01/07/86
4,563,204                   06/556,319                   01/07/86
4,563,207                   06/534,246                   01/07/86
4,563,218                   06/655,886                   01/07/86
4,563,225                   06/573,408                   01/07/86
4,563,226                   06/442,084                   01/07/86
4,563,232                   06/664,182                   01/07/86
4,563,242                   06/671,305                   01/07/86
4,563,246                   06/598,002                   01/07/86
4,563,250                   06/708,841                   01/07/86
4,563,251                   06/708,842                   01/07/86
4,563,261                   06/648,014                   01/07/86
4,563,264                   06/581,083                   01/07/86
4,563,267                   06/635,550                   01/07/86
4,563,268                   06/658,631                   01/07/86
4,563,275                   06/636,512                   01/07/86
4,563,278                   06/465,318                   01/07/86
4,563,280                   06/579,412                   01/07/86
4,563,281                   06/628,904                   01/07/86
4,563,282                   06/623,480                   01/07/86
4,563,287                   06/523,601                   01/07/86
4,563,288                   06/674,194                   01/07/86
4,563,289                   06/763,892                   01/07/86
4,563,290                   06/608,100                   01/07/86
4,563,295                   06/520,305                   01/07/86
4,563,304                   06/582,911                   01/07/86
4,563,305                   06/222,980                   01/07/86
4,563,309                   06/641,219                   01/07/86
4,563,314                   06/715,466                   01/07/86
4,563,315                   06/536,320                   01/07/86
4,563,317                   06/686,654                   01/07/86
4,563,318                   06/641,933                   01/07/86
4,563,325                   06/489,628                   01/07/86
4,563,326                   06/498,879                   01/07/86
4,563,328                   06/545,064                   01/07/86
4,563,331                   06/553,656                   01/07/86
4,563,340                   06/544,625                   01/07/86
4,563,343                   06/490,791                   01/07/86
4,563,345                   06/572,988                   01/07/86
4,563,348                   06/462,491                   01/07/86
4,563,349                   06/656,418                   01/07/86
4,563,350                   06/664,158                   01/07/86
4,563,369                   06/732,763                   01/07/86
4,563,373                   06/465,812                   01/07/86
4,563,390                   06/731,324                   01/07/86
4,563,391                   06/552,267                   01/07/86
4,563,397                   06/649,299                   01/07/86
4,563,425                   06/596,101                   01/07/86
4,563,428                   06/502,020                   01/07/86
4,563,430                   06/555,483                   01/07/86
4,563,444                   06/621,681                   01/07/86
4,563,446                   06/632,332                   01/07/86
4,563,449                   06/511,237                   01/07/86
4,563,450                   06/515,184                   01/07/86
4,563,467                   06/577,273                   01/07/86
4,563,471                   06/608,298                   01/07/86
4,563,473                   06/604,083                   01/07/86
4,563,477                   06/494,382                   01/07/86
4,563,479                   06/571,856                   01/07/86
4,563,484                   06/649,180                   01/07/86
4,563,494                   06/548,444                   01/07/86
4,563,497                   06/460,924                   01/07/86
4,563,498                   06/627,952                   01/07/86
4,563,501                   06/493,277                   01/07/86
4,563,506                   06/656,664                   01/07/86
4,563,511                   06/669,909                   01/07/86
4,563,515                   06/707,677                   01/07/86
4,563,524                   06/570,297                   01/07/86
4,563,530                   06/665,589                   01/07/86
4,563,531                   06/593,373                   01/07/86
4,563,533                   06/526,523                   01/07/86
4,563,534                   06/504,317                   01/07/86
4,563,537                   06/617,224                   01/07/86
4,563,538                   06/730,893                   01/07/86
4,563,541                   06/567,878                   01/07/86
4,563,544                   06/602,676                   01/07/86
4,563,545                   06/574,842                   01/07/86
4,563,546                   06/398,327                   01/07/86
4,563,550                   06/435,652                   01/07/86
4,563,555                   06/570,140                   01/07/86
4,563,568                   06/673,371                   01/07/86
4,563,572                   06/636,750                   01/07/86
4,563,573                   06/564,948                   01/07/86
4,563,574                   06/655,644                   01/07/86
4,563,575                   06/366,597                   01/07/86
4,563,578                   06/573,381                   01/07/86
4,563,591                   06/526,597                   01/07/86
4,563,597                   06/443,792                   01/07/86
4,563,598                   06/453,915                   01/07/86
4,563,600                   06/441,180                   01/07/86
4,563,604                   06/649,347                   01/07/86
4,563,627                   06/620,027                   01/07/86
4,563,642                   06/432,805                   01/07/86
4,563,643                   06/403,431                   01/07/86
4,563,644                   06/480,281                   01/07/86
4,563,656                   06/668,585                   01/07/86
4,563,662                   06/523,059                   01/07/86
4,563,666                   06/616,901                   01/07/86
4,563,675                   06/451,565                   01/07/86
4,563,678                   06/486,684                   01/07/86
4,563,681                   06/504,008                   01/07/86
4,563,690                   06/716,379                   01/07/86
4,563,692                   06/711,636                   01/07/86
4,563,699                   06/467,856                   01/07/86
4,563,718                   06/461,208                   01/07/86
4,563,720                   06/601,229                   01/07/86
4,563,725                   06/566,459                   01/07/86
4,563,726                   06/642,399                   01/07/86
4,563,731                   06/455,533                   01/07/86
4,563,744                   06/467,948                   01/07/86
4,563,752                   06/501,464                   01/07/86
4,563,757                   06/511,809                   01/07/86
4,563,758                   06/427,450                   01/07/86
4,563,761                   06/409,531                   01/07/86
4,563,762                   06/581,745                   01/07/86
4,563,773                   06/588,612                   01/07/86
4,890,338                   07/282,017                   01/02/90
4,890,340                   07/249,053                   01/02/90
4,890,342                   07/276,915                   01/02/90
4,890,343                   07/209,003                   01/02/90
4,890,347                   07/201,465                   01/02/90
4,890,348                   07/240,474                   01/02/90
4,890,353                   07/242,049                   01/02/90
4,890,364                   07/297,395                   01/02/90
4,890,381                   07/173,581                   01/02/90
4,890,382                   07/291,557                   01/02/90
4,890,394                   07/258,580                   01/02/90
4,890,395                   07/127,668                   01/02/90
4,890,400                   07/263,003                   01/02/90
4,890,402                   07/265,048                   01/02/90
4,890,410                   07/303,121                   01/02/90
4,890,412                   07/279,459                   01/02/90
4,890,420                   07/170,905                   01/02/90
4,890,424                   07/093,218                   01/02/90
4,890,425                   07/215,321                   01/02/90
4,890,426                   07/246,214                   01/02/90
4,890,437                   07/071,427                   01/02/90
4,890,440                   07/210,716                   01/02/90
4,890,447                   07/354,704                   01/02/90
4,890,450                   07/255,231                   01/02/90
4,890,452                   07/280,580                   01/02/90
4,890,454                   07/331,276                   01/02/90
4,890,456                   07/202,615                   01/02/90
4,890,462                   07/241,117                   01/02/90
4,890,463                   07/120,784                   01/02/90
4,890,468                   07/258,164                   01/02/90
4,890,473                   07/192,864                   01/02/90
4,890,474                   07/233,556                   01/02/90
4,890,476                   07/180,692                   01/02/90
4,890,479                   07/310,268                   01/02/90
4,890,482                   07/234,759                   01/02/90
4,890,484                   07/149,317                   01/02/90
4,890,488                   07/318,691                   01/02/90
4,890,490                   07/205,829                   01/02/90
4,890,492                   07/240,499                   01/02/90
4,890,495                   07/245,712                   01/02/90
4,890,498                   07/271,754                   01/02/90
4,890,502                   07/376,162                   01/02/90
4,890,518                   07/364,855                   01/02/90
4,890,520                   07/293,707                   01/02/90
4,890,521                   07/352,534                   01/02/90
4,890,524                   07/238,525                   01/02/90
4,890,528                   07/205,441                   01/02/90
4,890,532                   07/148,034                   01/02/90
4,890,535                   07/301,187                   01/02/90
4,890,550                   07/267,130                   01/02/90
4,890,560                   07/371,252                   01/02/90
4,890,568                   07/236,107                   01/02/90
4,890,569                   07/200,453                   01/02/90
4,890,570                   07/307,003                   01/02/90
4,890,572                   07/204,518                   01/02/90
4,890,577                   07/194,928                   01/02/90
4,890,580                   07/203,446                   01/02/90
4,890,581                   07/276,000                   01/02/90
4,890,582                   07/267,087                   01/02/90
4,890,587                   07/150,226                   01/02/90
4,890,595                   07/239,466                   01/02/90
4,890,597                   07/194,847                   01/02/90
4,890,598                   07/225,924                   01/02/90
4,890,602                   07/125,534                   01/02/90
4,890,603                   07/118,325                   01/02/90
4,890,606                   07/040,841                   01/02/90
4,890,609                   07/211,712                   01/02/90
4,890,618                   06/906,520                   01/02/90
4,890,619                   07/038,296                   01/02/90
4,890,621                   07/145,066                   01/02/90
4,890,624                   07/171,762                   01/02/90
4,890,625                   07/172,718                   01/02/90
4,890,626                   07/222,096                   01/02/90
4,890,627                   07/118,759                   01/02/90
4,890,631                   07/153,516                   01/02/90
4,890,633                   07/284,060                   01/02/90
4,890,638                   07/304,787                   01/02/90
4,890,644                   07/334,204                   01/02/90
4,890,646                   07/338,862                   01/02/90
4,890,648                   07/252,406                   01/02/90
4,890,649                   07/171,444                   01/02/90
4,890,653                   07/152,117                   01/02/90
4,890,655                   07/342,623                   01/02/90
4,890,659                   07/186,405                   01/02/90
4,890,667                   07/259,240                   01/02/90
4,890,668                   07/267,869                   01/02/90
4,890,670                   06/750,887                   01/02/90
4,890,671                   07/294,422                   01/02/90
4,890,677                   07/235,658                   01/02/90
4,890,681                   07/333,782                   01/02/90
4,890,686                   07/247,191                   01/02/90
4,890,693                   07/306,093                   01/02/90
4,890,694                   07/277,638                   01/02/90
4,890,695                   07/358,055                   01/02/90
4,890,698                   07/294,237                   01/02/90
4,890,705                   07/204,887                   01/02/90
4,890,713                   07/223,104                   01/02/90
4,890,715                   07/011,059                   01/02/90
4,890,717                   07/183,790                   01/02/90
4,890,718                   07/214,414                   01/02/90
4,890,731                   07/294,272                   01/02/90
4,890,733                   07/162,614                   01/02/90
4,890,734                   07/311,112                   01/02/90
4,890,740                   07/261,756                   01/02/90
4,890,742                   07/155,871                   01/02/90
4,890,748                   07/317,594                   01/02/90
4,890,751                   06/588,594                   01/02/90
4,890,754                   07/357,716                   01/02/90
4,890,757                   07/246,621                   01/02/90
4,890,759                   07/302,016                   01/02/90
4,890,765                   07/141,018                   01/02/90
4,890,771                   07/226,950                   01/02/90
4,890,777                   07/236,155                   01/02/90
4,890,779                   07/227,676                   01/02/90
4,890,782                   07/186,082                   01/02/90
4,890,796                   07/260,944                   01/02/90
4,890,800                   07/218,089                   01/02/90
4,890,801                   07/177,759                   01/02/90
4,890,806                   07/308,708                   01/02/90
4,890,808                   07/308,620                   01/02/90
4,890,810                   07/181,689                   01/02/90
4,890,811                   07/289,029                   01/02/90
4,890,812                   07/151,007                   01/02/90
4,890,823                   07/242,412                   01/02/90
4,890,826                   07/227,827                   01/02/90
4,890,827                   07/149,708                   01/02/90
4,890,830                   07/231,476                   01/02/90
4,890,837                   07/144,566                   01/02/90
4,890,840                   07/159,095                   01/02/90
4,890,841                   07/308,535                   01/02/90
4,890,853                   07/165,177                   01/02/90
4,890,857                   07/142,536                   01/02/90
4,890,867                   07/131,748                   01/02/90
4,890,874                   07/293,921                   01/02/90
4,890,875                   06/832,882                   01/02/90
4,890,888                   07/243,000                   01/02/90
4,890,891                   07/116,867                   01/02/90
4,890,895                   07/120,021                   01/02/90
4,890,896                   07/198,872                   01/02/90
4,890,900                   07/313,896                   01/02/90
4,890,903                   07/196,385                   01/02/90
4,890,905                   06/871,015                   01/02/90
4,890,906                   07/093,275                   01/02/90
4,890,914                   07/295,674                   01/02/90
4,890,917                   07/215,199                   01/02/90
4,890,920                   07/041,495                   01/02/90
4,890,922                   07/316,183                   01/02/90
4,890,925                   07/083,197                   01/02/90
4,890,926                   07/135,252                   01/02/90
4,890,929                   07/183,811                   01/02/90
4,890,930                   07/142,953                   01/02/90
4,890,936                   07/189,941                   01/02/90
4,890,940                   07/301,661                   01/02/90
4,890,942                   07/093,008                   01/02/90
4,890,950                   07/268,447                   01/02/90
4,890,952                   07/166,995                   01/02/90
4,890,960                   07/255,768                   01/02/90
4,890,966                   07/227,854                   01/02/90
4,890,970                   07/284,179                   01/02/90
4,890,971                   06/911,802                   01/02/90
4,890,982                   07/208,884                   01/02/90
4,890,989                   07/154,594                   01/02/90
4,890,990                   07/181,356                   01/02/90
4,890,991                   07/228,467                   01/02/90
4,890,993                   07/141,980                   01/02/90
4,891,006                   07/242,106                   01/02/90
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