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 May 20, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,816                  07/151,275                   01/03/89
(4,589,711)                (06/686,093)                (05/20/86)
Re. 33,262                  07/181,212                   07/17/90
(4,589,311)                (06/549,346)                (05/20/86)
Re. 33,958                  07/695,457                   06/16/92
(4,924,691)                (07/314,777)                (05/15/90)
4,589,149                   06/702,497                   05/20/86
4,589,157                   06/698,267                   05/20/86
4,589,159                   06/566,210                   05/20/86
4,589,162                   06/651,981                   05/20/86
4,589,163                   06/584,159                   05/20/86
4,589,164                   06/618,897                   05/20/86
4,589,174                   06/593,730                   05/20/86
4,589,177                   06/735,820                   05/20/86
4,589,187                   06/572,801                   05/20/86
4,589,200                   06/748,102                   05/20/86
4,589,202                   06/637,932                   05/20/86
4,589,227                   06/605,551                   05/20/86
4,589,235                   06/588,447                   05/20/86
4,589,236                   06/617,318                   05/20/86
4,589,242                   06/610,608                   05/20/86
4,589,244                   06/483,056                   05/20/86
4,589,254                   06/630,053                   05/20/86
4,589,255                   06/664,643                   05/20/86
4,589,256                   06/543,829                   05/20/86
4,589,259                   06/756,321                   05/20/86
4,589,260                   06/549,317                   05/20/86
4,589,274                   06/645,199                   05/20/86
4,589,279                   06/733,146                   05/20/86
4,589,280                   06/666,358                   05/20/86
4,589,282                   06/642,459                   05/20/86
4,589,284                   06/683,304                   05/20/86
4,589,286                   06/595,114                   05/20/86
4,589,301                   06/488,963                   05/20/86
4,589,303                   06/643,938                   05/20/86
4,589,319                   06/679,652                   05/20/86
4,589,327                   06/593,389                   05/20/86
4,589,329                   06/504,249                   05/20/86
4,589,332                   06/771,596                   05/20/86
4,589,341                   06/744,511                   05/20/86
4,589,345                   06/600,812                   05/20/86
4,589,358                   06/699,027                   05/20/86
4,589,360                   06/766,904                   05/20/86
4,589,368                   06/655,943                   05/20/86
4,589,374                   06/730,388                   05/20/86
4,589,378                   06/689,914                   05/20/86
4,589,379                   06/663,207                   05/20/86
4,589,380                   06/628,829                   05/20/86
4,589,382                   06/456,692                   05/20/86
4,589,389                   06/743,977                   05/20/86
4,589,396                   06/755,721                   05/20/86
4,589,397                   06/634,393                   05/20/86
4,589,408                   06/636,893                   05/20/86
4,589,412                   06/567,506                   05/20/86
4,589,414                   06/602,607                   05/20/86
4,589,415                   06/645,831                   05/20/86
4,589,417                   06/648,818                   05/20/86
4,589,420                   06/630,782                   05/20/86
4,589,425                   06/627,335                   05/20/86
4,589,430                   06/595,685                   05/20/86
4,589,435                   06/653,709                   05/20/86
4,589,437                   06/568,582                   05/20/86
4,589,443                   06/627,996                   05/20/86
4,589,444                   06/610,708                   05/20/86
4,589,448                   06/634,477                   05/20/86
4,589,452                   06/677,075                   05/20/86
4,589,470                   06/608,079                   05/20/86
4,589,473                   06/710,501                   05/20/86
4,589,476                   06/734,940                   05/20/86
4,589,482                   06/617,025                   05/20/86
4,589,488                   06/506,186                   05/20/86
4,589,489                   06/672,543                   05/20/86
4,589,497                   06/610,200                   05/20/86
4,589,498                   06/705,199                   05/20/86
4,589,510                   06/627,454                   05/20/86
4,589,515                   06/679,247                   05/20/86
4,589,524                   06/753,201                   05/20/86
4,589,535                   06/650,951                   05/20/86
4,589,539                   06/532,436                   05/20/86
4,589,543                   06/658,188                   05/20/86
4,589,546                   06/690,258                   05/20/86
4,589,550                   06/694,653                   05/20/86
4,589,560                   06/654,753                   05/20/86
4,589,563                   06/649,076                   05/20/86
4,589,564                   06/720,198                   05/20/86
4,589,565                   06/709,100                   05/20/86
4,589,568                   06/597,441                   05/20/86
4,589,576                   06/523,930                   05/20/86
4,589,583                   06/642,403                   05/20/86
4,589,585                   06/779,015                   05/20/86
4,589,594                   06/605,286                   05/20/86
4,589,597                   06/538,204                   05/20/86
4,589,606                   06/665,664                   05/20/86
4,589,607                   06/692,768                   05/20/86
4,589,610                   06/549,861                   05/20/86
4,589,615                   06/402,464                   05/20/86
4,589,618                   06/435,599                   05/20/86
4,589,620                   06/563,441                   05/20/86
4,589,622                   06/676,164                   05/20/86
4,589,637                   06/593,717                   05/20/86
4,589,641                   06/726,425                   05/20/86
4,589,642                   06/631,593                   05/20/86
4,589,644                   06/755,185                   05/20/86
4,589,655                   06/657,981                   05/20/86
4,589,672                   06/589,771                   05/20/86
4,589,673                   06/471,168                   05/20/86
4,589,674                   06/748,386                   05/20/86
4,589,683                   06/585,080                   05/20/86
4,589,685                   06/637,154                   05/20/86
4,589,690                   06/705,534                   05/20/86
4,589,695                   06/594,313                   05/20/86
4,589,700                   06/582,049                   05/20/86
4,589,710                   06/601,846                   05/20/86
4,589,717                   06/565,794                   05/20/86
4,589,718                   06/758,012                   05/20/86
4,589,719                   06/649,137                   05/20/86
4,589,730                   06/517,651                   05/20/86
4,589,736                   06/674,436                   05/20/86
4,589,737                   06/605,736                   05/20/86
4,589,742                   06/643,911                   05/20/86
4,589,749                   06/709,853                   05/20/86
4,589,768                   06/667,445                   05/20/86
4,589,775                   06/554,549                   05/20/86
4,589,780                   06/787,699                   05/20/86
4,589,782                   06/618,961                   05/20/86
4,589,786                   06/520,772                   05/20/86
4,589,788                   06/678,357                   05/20/86
4,589,793                   06/614,663                   05/20/86
4,589,798                   06/616,673                   05/20/86
4,589,809                   06/529,158                   05/20/86
4,589,819                   06/615,635                   05/20/86
4,589,834                   06/763,591                   05/20/86
4,589,838                   06/721,324                   05/20/86
4,589,847                   06/638,635                   05/20/86
4,589,850                   06/651,848                   05/20/86
4,589,851                   06/732,113                   05/20/86
4,589,852                   06/671,625                   05/20/86
4,589,856                   06/706,670                   05/20/86
4,589,859                   06/658,272                   05/20/86
4,589,860                   06/615,779                   05/20/86
4,589,863                   06/603,202                   05/20/86
4,589,864                   06/668,420                   05/20/86
4,589,867                   06/671,965                   05/20/86
4,589,868                   06/588,282                   05/20/86
4,589,870                   06/581,801                   05/20/86
4,589,873                   06/614,620                   05/20/86
4,589,877                   06/749,598                   05/20/86
4,589,878                   06/593,920                   05/20/86
4,589,888                   06/658,306                   05/20/86
4,589,902                   06/771,355                   05/20/86
4,589,904                   06/769,058                   05/20/86
4,589,916                   06/704,242                   05/20/86
4,589,922                   06/555,277                   05/20/86
4,589,937                   06/421,634                   05/20/86
4,589,948                   06/531,760                   05/20/86
4,589,952                   06/670,463                   05/20/86
4,589,956                   06/606,006                   05/20/86
4,589,958                   06/697,935                   05/20/86
4,589,965                   06/671,475                   05/20/86
4,589,976                   06/692,945                   05/20/86
4,589,979                   06/768,530                   05/20/86
4,589,991                   06/749,989                   05/20/86
4,589,994                   06/682,656                   05/20/86
4,589,996                   06/645,097                   05/20/86
4,589,998                   06/529,190                   05/20/86
4,590,001                   06/593,725                   05/20/86
4,590,010                   06/724,474                   05/20/86
4,590,012                   06/735,148                   05/20/86
4,590,013                   06/735,151                   05/20/86
4,590,014                   06/647,918                   05/20/86
4,590,017                   06/703,063                   05/20/86
4,590,018                   06/701,029                   05/20/86
4,590,022                   06/662,507                   05/20/86
4,590,030                   06/617,814                   05/20/86
4,590,032                   06/624,086                   05/20/86
4,590,033                   06/695,153                   05/20/86
4,590,035                   06/698,446                   05/20/86
4,590,039                   06/420,436                   05/20/86
4,590,048                   06/678,420                   05/20/86
4,590,051                   06/666,932                   05/20/86
4,590,055                   06/525,702                   05/20/86
4,590,056                   06/707,258                   05/20/86
4,590,061                   06/732,651                   05/20/86
4,590,074                   06/787,547                   05/20/86
4,590,079                   06/688,144                   05/20/86
4,590,081                   06/672,252                   05/20/86
4,590,083                   06/538,266                   05/20/86
4,590,085                   06/713,770                   05/20/86
4,590,086                   06/729,192                   05/20/86
4,590,087                   06/574,498                   05/20/86
4,590,090                   06/402,706                   05/20/86
4,590,109                   06/713,811                   05/20/86
4,590,110                   06/610,242                   05/20/86
4,590,116                   06/577,221                   05/20/86
4,590,119                   06/622,771                   05/20/86
4,590,120                   06/691,855                   05/20/86
4,590,128                   06/704,380                   05/20/86
4,590,134                   06/733,030                   05/20/86
4,590,135                   06/733,028                   05/20/86
4,590,137                   06/595,531                   05/20/86
4,590,138                   06/729,453                   05/20/86
4,590,143                   06/584,546                   05/20/86
4,590,145                   06/750,703                   05/20/86
4,590,149                   06/672,763                   05/20/86
4,590,160                   06/469,947                   05/20/86
4,590,161                   06/583,325                   05/20/86
4,590,167                   06/634,685                   05/20/86
4,590,169                   06/553,209                   05/20/86
4,590,178                   06/590,428                   05/20/86
4,590,185                   06/718,085                   05/20/86
4,590,186                   06/690,251                   05/20/86
4,590,189                   06/478,478                   05/20/86
4,590,190                   06/510,133                   05/20/86
4,590,196                   06/643,614                   05/20/86
4,590,199                   06/635,308                   05/20/86
4,590,203                   06/548,753                   05/20/86
4,590,206                   06/606,542                   05/20/86
4,590,209                   06/522,546                   05/20/86
4,590,215                   06/622,598                   05/20/86
4,590,216                   06/648,028                   05/20/86
4,590,224                   06/642,451                   05/20/86
4,590,230                   06/647,070                   05/20/86
4,590,235                   06/721,215                   05/20/86
4,590,236                   06/703,093                   05/20/86
4,590,240                   06/685,601                   05/20/86
4,590,247                   06/656,454                   05/20/86
4,590,250                   06/754,409                   05/20/86
4,590,256                   06/775,706                   05/20/86
4,590,259                   06/677,114                   05/20/86
4,590,263                   06/428,455                   05/20/86
4,590,265                   06/724,747                   05/20/86
4,590,268                   06/490,288                   05/20/86
4,590,281                   06/587,166                   05/20/86
4,590,293                   06/592,739                   05/20/86
4,590,294                   06/765,164                   05/20/86
4,590,297                   06/709,613                   05/20/86
4,590,299                   06/700,370                   05/20/86
4,590,300                   06/689,891                   05/20/86
4,590,304                   06/734,299                   05/20/86
4,590,313                   06/384,318                   05/20/86
4,590,314                   06/671,886                   05/20/86
4,590,318                   06/674,192                   05/20/86
4,590,329                   06/692,948                   05/20/86
4,590,339                   06/702,575                   05/20/86
4,590,340                   06/696,143                   05/20/86
4,590,347                   06/548,824                   05/20/86
4,590,351                   06/715,110                   05/20/86
4,590,357                   06/472,288                   05/20/86
4,590,358                   06/657,556                   05/20/86
4,590,363                   06/497,200                   05/20/86
4,590,372                   06/586,129                   05/20/86
4,590,379                   06/418,794                   05/20/86
4,590,386                   06/652,841                   05/20/86
4,590,393                   06/503,944                   05/20/86
4,590,394                   06/589,269                   05/20/86
4,590,395                   06/632,578                   05/20/86
4,590,397                   06/677,031                   05/20/86
4,590,400                   06/665,237                   05/20/86
4,590,404                   06/595,522                   05/20/86
4,590,405                   06/750,663                   05/20/86
4,590,407                   06/576,591                   05/20/86
4,590,418                   06/668,427                   05/20/86
4,590,421                   06/549,457                   05/20/86
4,590,422                   06/288,454                   05/20/86
4,590,424                   06/535,307                   05/20/86
4,590,429                   06/552,251                   05/20/86
4,590,431                   06/564,129                   05/20/86
4,590,441                   06/679,970                   05/20/86
4,590,445                   06/620,623                   05/20/86
4,590,452                   06/640,607                   05/20/86
4,590,460                   06/657,161                   05/20/86
4,590,461                   06/658,392                   05/20/86
4,590,466                   06/505,996                   05/20/86
4,590,468                   06/474,135                   05/20/86
4,590,478                   06/504,566                   05/20/86
4,590,498                   06/583,019                   05/20/86
4,590,506                   06/539,447                   05/20/86
4,590,509                   06/539,448                   05/20/86
4,590,511                   06/567,710                   05/20/86
4,590,516                   06/383,604                   05/20/86
4,590,519                   06/491,416                   05/20/86
4,590,520                   06/555,509                   05/20/86
4,590,522                   06/487,770                   05/20/86
4,590,524                   06/553,234                   05/20/86
4,590,528                   06/601,495                   05/20/86
4,590,531                   06/641,256                   05/20/86
4,590,541                   06/720,304                   05/20/86
4,590,542                   06/713,262                   05/20/86
4,590,549                   06/498,860                   05/20/86
4,590,551                   06/608,272                   05/20/86
4,590,567                   06/709,477                   05/20/86
4,590,568                   06/539,188                   05/20/86
4,590,569                   06/542,165                   05/20/86
4,590,573                   06/419,319                   05/20/86
4,590,574                   06/489,930                   05/20/86
4,590,575                   06/537,641                   05/20/86
4,590,578                   06/512,829                   05/20/86
4,590,586                   06/630,140                   05/20/86
4,590,590                   06/555,979                   05/20/86
4,590,597                   06/612,291                   05/20/86
4,590,598                   06/620,344                   05/20/86
4,590,600                   06/664,623                   05/20/86
4,590,601                   06/685,702                   05/20/86
4,590,604                   06/457,788                   05/20/86
4,590,607                   06/755,706                   05/20/86
4,590,614                   06/571,078                   05/20/86
4,590,618                   06/589,270                   05/20/86
4,590,620                   06/788,365                   05/20/86
4,924,525                   07/194,468                   05/15/90
4,924,526                   07/179,735                   05/15/90
4,924,536                   07/361,650                   05/15/90
4,924,537                   07/320,065                   05/15/90
4,924,542                   07/347,687                   05/15/90
4,924,550                   07/259,718                   05/15/90
4,924,551                   07/314,125                   05/15/90
4,924,552                   07/374,266                   05/15/90
4,924,554                   07/281,811                   05/15/90
4,924,555                   07/384,424                   05/15/90
4,924,556                   07/184,973                   05/15/90
4,924,564                   07/384,783                   05/15/90
4,924,569                   06/941,705                   05/15/90
4,924,576                   07/319,272                   05/15/90
4,924,577                   07/204,283                   05/15/90
4,924,578                   07/295,978                   05/15/90
4,924,579                   07/198,770                   05/15/90
4,924,586                   07/279,009                   05/15/90
4,924,587                   07/258,720                   05/15/90
4,924,588                   06/941,087                   05/15/90
4,924,595                   07/106,112                   05/15/90
4,924,598                   07/204,389                   05/15/90
4,924,601                   07/385,500                   05/15/90
4,924,602                   07/171,480                   05/15/90
4,924,605                   07/011,409                   05/15/90
4,924,607                   07/332,164                   05/15/90
4,924,610                   07/355,293                   05/15/90
4,924,617                   07/385,660                   05/15/90
4,924,619                   07/223,299                   05/15/90
4,924,628                   07/234,312                   05/15/90
4,924,634                   07/212,448                   05/15/90
4,924,639                   07/186,394                   05/15/90
4,924,643                   07/307,128                   05/15/90
4,924,645                   07/318,600                   05/15/90
4,924,647                   07/393,377                   05/15/90
4,924,657                   07/190,384                   05/15/90
4,924,658                   07/306,446                   05/15/90
4,924,665                   07/286,033                   05/15/90
4,924,670                   07/229,840                   05/15/90
4,924,673                   07/156,820                   05/15/90
4,924,675                   07/371,510                   05/15/90
4,924,678                   07/375,440                   05/15/90
4,924,681                   07/354,901                   05/15/90
4,924,689                   07/163,088                   05/15/90
4,924,693                   07/285,465                   05/15/90
4,924,696                   07/384,375                   05/15/90
4,924,701                   07/240,707                   05/15/90
4,924,708                   07/308,291                   05/15/90
4,924,711                   07/308,676                   05/15/90
4,924,716                   07/352,277                   05/15/90
4,924,721                   07/115,326                   05/15/90
4,924,722                   07/297,895                   05/15/90
4,924,725                   07/321,681                   05/15/90
4,924,728                   07/325,318                   05/15/90
4,924,730                   07/230,787                   05/15/90
4,924,731                   07/293,266                   05/15/90
4,924,736                   07/347,059                   05/15/90
4,924,739                   06/623,361                   05/15/90
4,924,740                   07/229,057                   05/15/90
4,924,741                   07/223,113                   05/15/90
4,924,749                   07/006,001                   05/15/90
4,924,765                   07/267,084                   05/15/90
4,924,769                   07/333,823                   05/15/90
4,924,779                   07/312,957                   05/15/90
4,924,780                   07/218,576                   05/15/90
4,924,785                   07/280,014                   05/15/90
4,924,789                   07/369,640                   05/15/90
4,924,790                   07/311,625                   05/15/90
4,924,794                   07/265,541                   05/15/90
4,924,795                   07/273,460                   05/15/90
4,924,799                   07/248,922                   05/15/90
4,924,818                   07/177,532                   05/15/90
4,924,819                   07/351,608                   05/15/90
4,924,821                   07/288,290                   05/15/90
4,924,825                   07/324,409                   05/15/90
4,924,828                   07/315,403                   05/15/90
4,924,838                   07/343,989                   05/15/90
4,924,841                   07/389,677                   05/15/90
4,924,857                   07/288,899                   05/15/90
4,924,862                   07/087,154                   05/15/90
4,924,872                   07/341,822                   05/15/90
4,924,873                   07/172,287                   05/15/90
4,924,878                   07/268,729                   05/15/90
4,924,887                   06/825,704                   05/15/90
4,924,890                   06/864,633                   05/15/90
4,924,891                   07/173,529                   05/15/90
4,924,898                   07/062,625                   05/15/90
4,924,903                   07/333,301                   05/15/90
4,924,905                   07/004,906                   05/15/90
4,924,907                   07/327,598                   05/15/90
4,924,912                   07/447,776                   05/15/90
4,924,913                   07/150,959                   05/15/90
4,924,919                   07/266,709                   05/15/90
4,924,923                   07/353,272                   05/15/90
4,924,930                   07/234,007                   05/15/90
4,924,931                   07/144,166                   05/15/90
4,924,932                   07/224,941                   05/15/90
4,924,938                   07/113,177                   05/15/90
4,924,941                   07/428,871                   05/15/90
4,924,942                   07/317,004                   05/15/90
4,924,945                   07/257,393                   05/15/90
4,924,946                   07/304,795                   05/15/90
4,924,953                   07/341,206                   05/15/90
4,924,954                   07/380,623                   05/15/90
4,924,957                   07/195,984                   05/15/90
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5,312,252                   08/075,050                   05/17/94
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