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 February 4, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,736                  07/006,444                   08/23/88
(4,568,094)                (06/602,545)                (02/04/86)
Re. 32,803                  07/085,837                   12/20/88
(4,567,971)                (06/462,280)                (02/04/86)
4,567,614                   06/521,329                   02/04/86
4,567,619                   06/599,407                   02/04/86
4,567,624                   06/583,714                   02/04/86
4,567,631                   06/541,564                   02/04/86
4,567,635                   06/647,164                   02/04/86
4,567,641                   06/650,314                   02/04/86
4,567,644                   06/673,631                   02/04/86
4,567,645                   06/533,016                   02/04/86
4,567,648                   06/574,014                   02/04/86
4,567,655                   06/663,163                   02/04/86
4,567,659                   06/727,100                   02/04/86
4,567,660                   06/657,720                   02/04/86
4,567,661                   06/706,837                   02/04/86
4,567,666                   06/527,908                   02/04/86
4,567,667                   06/683,072                   02/04/86
4,567,672                   06/616,890                   02/04/86
4,567,676                   06/521,162                   02/04/86
4,567,677                   06/645,332                   02/04/86
4,567,684                   06/486,953                   02/04/86
4,567,685                   06/477,350                   02/04/86
4,567,692                   06/593,166                   02/04/86
4,567,696                   06/584,982                   02/04/86
4,567,701                   06/692,175                   02/04/86
4,567,703                   06/561,312                   02/04/86
4,567,708                   06/536,401                   02/04/86
4,567,716                   06/592,644                   02/04/86
4,567,723                   06/597,464                   02/04/86
4,567,725                   06/569,483                   02/04/86
4,567,726                   06/528,896                   02/04/86
4,567,729                   06/651,418                   02/04/86
4,567,733                   06/539,078                   02/04/86
4,567,735                   06/609,987                   02/04/86
4,567,744                   06/571,534                   02/04/86
4,567,755                   06/584,383                   02/04/86
4,567,757                   06/713,360                   02/04/86
4,567,767                   06/610,352                   02/04/86
4,567,769                   06/587,713                   02/04/86
4,567,775                   06/655,519                   02/04/86
4,567,781                   06/618,941                   02/04/86
4,567,784                   06/480,679                   02/04/86
4,567,785                   06/562,362                   02/04/86
4,567,786                   06/451,657                   02/04/86
4,567,792                   06/612,141                   02/04/86
4,567,794                   06/493,746                   02/04/86
4,567,807                   06/445,562                   02/04/86
4,567,809                   06/480,643                   02/04/86
4,567,814                   06/549,263                   02/04/86
4,567,816                   06/673,586                   02/04/86
4,567,817                   06/436,936                   02/04/86
4,567,828                   06/589,908                   02/04/86
4,567,831                   06/619,342                   02/04/86
4,567,837                   06/563,759                   02/04/86
4,567,846                   06/715,674                   02/04/86
4,567,847                   06/676,855                   02/04/86
4,567,848                   06/737,952                   02/04/86
4,567,860                   06/660,250                   02/04/86
4,567,864                   06/462,007                   02/04/86
4,567,865                   06/624,606                   02/04/86
4,567,866                   06/686,455                   02/04/86
4,567,893                   06/673,690                   02/04/86
4,567,895                   06/595,888                   02/04/86
4,567,898                   06/754,192                   02/04/86
4,567,904                   06/457,814                   02/04/86
4,567,907                   06/624,753                   02/04/86
4,567,912                   06/636,128                   02/04/86
4,567,914                   06/524,171                   02/04/86
4,567,920                   06/554,635                   02/04/86
4,567,921                   06/616,276                   02/04/86
4,567,932                   06/612,326                   02/04/86
4,567,934                   06/582,730                   02/04/86
4,567,936                   06/641,908                   02/04/86
4,567,937                   06/644,654                   02/04/86
4,567,955                   06/645,995                   02/04/86
4,567,958                   06/534,104                   02/04/86
4,567,965                   06/360,297                   02/04/86
4,567,967                   06/608,041                   02/04/86
4,567,978                   06/541,461                   02/04/86
4,567,987                   06/644,364                   02/04/86
4,567,998                   06/576,086                   02/04/86
4,568,004                   06/563,634                   02/04/86
4,568,006                   06/667,409                   02/04/86
4,568,008                   06/513,156                   02/04/86
4,568,013                   06/448,152                   02/04/86
4,568,032                   06/633,888                   02/04/86
4,568,037                   06/598,693                   02/04/86
4,568,040                   06/446,728                   02/04/86
4,568,053                   06/510,396                   02/04/86
4,568,065                   06/461,459                   02/04/86
4,568,067                   06/531,508                   02/04/86
4,568,073                   06/694,894                   02/04/86
4,568,078                   06/524,446                   02/04/86
4,568,089                   06/584,916                   02/04/86
4,568,096                   06/601,858                   02/04/86
4,568,100                   06/605,653                   02/04/86
4,568,110                   06/464,441                   02/04/86
4,568,113                   06/481,797                   02/04/86
4,568,117                   06/655,107                   02/04/86
4,568,122                   06/665,888                   02/04/86
4,568,123                   06/636,286                   02/04/86
4,568,125                   06/591,499                   02/04/86
4,568,135                   06/724,934                   02/04/86
4,568,139                   06/680,139                   02/04/86
4,568,143                   06/375,016                   02/04/86
4,568,145                   06/678,362                   02/04/86
4,568,153                   06/518,325                   02/04/86
4,568,154                   06/580,816                   02/04/86
4,568,158                   06/593,711                   02/04/86
4,568,172                   06/541,612                   02/04/86
4,568,173                   06/681,574                   02/04/86
4,568,182                   06/335,141                   02/04/86
4,568,185                   06/496,684                   02/04/86
4,568,187                   06/504,437                   02/04/86
4,568,198                   06/498,546                   02/04/86
4,568,201                   06/502,727                   02/04/86
4,568,205                   06/703,882                   02/04/86
4,568,208                   06/662,910                   02/04/86
4,568,211                   06/637,185                   02/04/86
4,568,214                   06/564,640                   02/04/86
4,568,217                   06/591,706                   02/04/86
4,568,219                   06/616,680                   02/04/86
4,568,220                   06/587,245                   02/04/86
4,568,244                   06/477,696                   02/04/86
4,568,245                   06/477,708                   02/04/86
4,568,246                   06/477,709                   02/04/86
4,568,251                   06/586,798                   02/04/86
4,568,253                   06/756,921                   02/04/86
4,568,254                   06/618,362                   02/04/86
4,568,259                   06/761,715                   02/04/86
4,568,262                   06/657,186                   02/04/86
4,568,265                   06/675,932                   02/04/86
4,568,266                   06/664,107                   02/04/86
4,568,268                   06/719,593                   02/04/86
4,568,273                   06/590,555                   02/04/86
4,568,277                   06/563,434                   02/04/86
4,568,279                   06/708,519                   02/04/86
4,568,289                   06/489,452                   02/04/86
4,568,299                   06/457,460                   02/04/86
4,568,319                   06/706,063                   02/04/86
4,568,324                   06/669,853                   02/04/86
4,568,326                   06/603,832                   02/04/86
4,568,333                   06/511,256                   02/04/86
4,568,337                   06/601,310                   02/04/86
4,568,338                   06/534,774                   02/04/86
4,568,342                   06/686,439                   02/04/86
4,568,346                   06/544,853                   02/04/86
4,568,348                   06/474,801                   02/04/86
4,568,349                   06/408,189                   02/04/86
4,568,352                   06/613,667                   02/04/86
4,568,353                   06/472,224                   02/04/86
4,568,357                   06/685,385                   02/04/86
4,568,359                   06/713,159                   02/04/86
4,568,373                   06/497,064                   02/04/86
4,568,389                   06/532,510                   02/04/86
4,568,397                   06/649,650                   02/04/86
4,568,400                   06/648,800                   02/04/86
4,568,417                   06/569,647                   02/04/86
4,568,422                   06/537,360                   02/04/86
4,568,429                   06/585,713                   02/04/86
4,568,435                   06/676,046                   02/04/86
4,568,436                   06/411,221                   02/04/86
4,568,449                   06/700,041                   02/04/86
4,568,467                   06/574,493                   02/04/86
4,568,468                   06/695,604                   02/04/86
4,568,469                   06/697,291                   02/04/86
4,568,472                   06/597,965                   02/04/86
4,568,479                   06/651,315                   02/04/86
4,568,480                   06/552,643                   02/04/86
4,568,483                   06/504,724                   02/04/86
4,568,490                   06/743,738                   02/04/86
4,568,503                   06/607,181                   02/04/86
4,568,506                   06/500,229                   02/04/86
4,568,509                   06/522,243                   02/04/86
4,568,518                   06/557,209                   02/04/86
4,568,519                   06/509,082                   02/04/86
4,568,521                   06/592,915                   02/04/86
4,568,542                   06/269,557                   02/04/86
4,568,546                   06/498,145                   02/04/86
4,568,558                   06/697,776                   02/04/86
4,568,568                   06/688,204                   02/04/86
4,568,570                   06/661,007                   02/04/86
4,568,575                   06/603,023                   02/04/86
4,568,577                   06/336,518                   02/04/86
4,568,581                   06/649,680                   02/04/86
4,568,588                   06/542,559                   02/04/86
4,568,596                   06/632,096                   02/04/86
4,568,601                   06/663,017                   02/04/86
4,568,607                   06/660,359                   02/04/86
4,568,610                   06/672,700                   02/04/86
4,568,614                   06/625,058                   02/04/86
4,568,620                   06/630,630                   02/04/86
4,568,622                   06/621,087                   02/04/86
4,568,627                   06/511,331                   02/04/86
4,568,629                   06/553,765                   02/04/86
4,568,639                   06/703,759                   02/04/86
4,568,642                   06/685,894                   02/04/86
4,568,657                   06/657,150                   02/04/86
4,568,662                   06/677,230                   02/04/86
4,568,664                   06/362,383                   02/04/86
4,568,668                   06/572,914                   02/04/86
4,568,674                   06/700,366                   02/04/86
4,568,682                   06/504,789                   02/04/86
4,568,692                   06/610,522                   02/04/86
4,568,696                   06/718,270                   02/04/86
4,568,697                   06/622,935                   02/04/86
4,568,700                   06/525,619                   02/04/86
4,568,702                   06/722,913                   02/04/86
4,568,703                   06/635,351                   02/04/86
4,568,712                   06/281,723                   02/04/86
4,568,720                   06/704,997                   02/04/86
4,568,726                   06/713,160                   02/04/86
4,568,727                   06/710,878                   02/04/86
4,568,731                   06/532,340                   02/04/86
4,568,732                   06/689,828                   02/04/86
4,568,734                   06/588,636                   02/04/86
4,568,740                   06/594,318                   02/04/86
4,568,742                   06/669,191                   02/04/86
4,568,747                   06/316,613                   02/04/86
4,568,749                   06/700,795                   02/04/86
4,568,754                   06/587,043                   02/04/86
4,568,757                   06/574,741                   02/04/86
4,568,759                   06/587,476                   02/04/86
4,568,763                   06/627,382                   02/04/86
4,568,767                   06/333,942                   02/04/86
4,568,769                   06/622,865                   02/04/86
4,568,776                   06/677,232                   02/04/86
4,568,784                   06/703,007                   02/04/86
4,568,792                   06/576,727                   02/04/86
4,568,794                   06/633,788                   02/04/86
4,568,795                   06/524,864                   02/04/86
4,568,798                   06/550,706                   02/04/86
4,568,802                   06/606,278                   02/04/86
4,568,816                   06/486,405                   02/04/86
4,568,826                   06/494,406                   02/04/86
4,568,828                   06/255,384                   02/04/86
4,568,829                   06/413,282                   02/04/86
4,568,843                   06/505,175                   02/04/86
4,568,846                   06/546,210                   02/04/86
4,568,850                   06/700,573                   02/04/86
4,568,851                   06/649,382                   02/04/86
4,568,877                   06/531,989                   02/04/86
4,568,879                   06/369,979                   02/04/86
4,568,880                   06/526,277                   02/04/86
4,568,887                   06/578,461                   02/04/86
4,568,889                   06/528,208                   02/04/86
4,568,890                   06/558,657                   02/04/86
4,568,892                   06/591,979                   02/04/86
4,568,896                   06/688,528                   02/04/86
4,568,897                   06/505,666                   02/04/86
4,568,898                   06/644,795                   02/04/86
4,568,905                   06/531,798                   02/04/86
4,568,910                   06/450,777                   02/04/86
4,568,914                   06/536,064                   02/04/86
4,568,915                   06/550,853                   02/04/86
4,568,919                   06/552,903                   02/04/86
4,568,927                   06/433,684                   02/04/86
4,568,930                   06/459,892                   02/04/86
4,568,941                   06/393,334                   02/04/86
4,568,944                   06/516,164                   02/04/86
4,568,959                   06/500,502                   02/04/86
4,568,962                   06/440,117                   02/04/86
4,568,964                   06/558,062                   02/04/86
4,568,965                   06/484,527                   02/04/86
4,568,967                   06/552,614                   02/04/86
4,568,968                   06/750,976                   02/04/86
4,568,969                   06/500,340                   02/04/86
4,568,975                   06/637,150                   02/04/86
4,568,977                   06/509,831                   02/04/86
4,568,979                   06/589,339                   02/04/86
4,568,983                   06/559,142                   02/04/86
4,568,984                   06/497,509                   02/04/86
4,568,986                   06/518,688                   02/04/86
4,568,987                   06/563,433                   02/04/86
4,568,990                   06/442,420                   02/04/86
4,568,991                   06/447,816                   02/04/86
4,569,010                   06/576,491                   02/04/86
4,569,013                   06/507,493                   02/04/86
4,569,017                   06/564,132                   02/04/86
4,569,018                   06/441,967                   02/04/86
4,569,020                   06/498,252                   02/04/86
4,569,024                   06/531,646                   02/04/86
4,569,025                   06/494,234                   02/04/86
4,569,028                   06/507,472                   02/04/86
4,569,030                   06/445,347                   02/04/86
4,569,031                   06/477,576                   02/04/86
4,569,032                   06/564,929                   02/04/86
4,569,040                   06/571,442                   02/04/86
4,569,043                   06/773,083                   02/04/86
4,569,045                   06/501,661                   02/04/86
4,569,053                   06/444,132                   02/04/86
4,569,060                   06/528,356                   02/04/86
4,569,061                   06/588,184                   02/04/86
4,569,063                   06/506,562                   02/04/86
4,569,065                   06/645,963                   02/04/86
4,569,075                   06/399,385                   02/04/86
4,569,078                   06/419,260                   02/04/86
4,569,079                   06/471,715                   02/04/86
4,569,081                   06/567,309                   02/04/86
4,569,085                   06/474,622                   02/04/86
4,896,380                   07/296,780                   01/30/90
4,896,386                   07/167,387                   01/30/90
4,896,393                   07/275,950                   01/30/90
4,896,394                   07/204,500                   01/30/90
4,896,401                   07/181,488                   01/30/90
4,896,403                   07/207,074                   01/30/90
4,896,406                   07/328,782                   01/30/90
4,896,407                   07/318,252                   01/30/90
4,896,412                   07/316,093                   01/30/90
4,896,413                   07/248,938                   01/30/90
4,896,419                   07/322,846                   01/30/90
4,896,420                   07/105,876                   01/30/90
4,896,423                   07/218,281                   01/30/90
4,896,425                   07/230,191                   01/30/90
4,896,429                   07/238,214                   01/30/90
4,896,432                   07/260,441                   01/30/90
4,896,433                   07/323,805                   01/30/90
4,896,447                   07/292,360                   01/30/90
4,896,456                   07/268,874                   01/30/90
4,896,459                   07/191,682                   01/30/90
4,896,463                   07/181,773                   01/30/90
4,896,464                   07/207,085                   01/30/90
4,896,473                   07/335,440                   01/30/90
4,896,474                   07/105,780                   01/30/90
4,896,480                   07/301,807                   01/30/90
4,896,490                   07/214,954                   01/30/90
4,896,494                   07/276,372                   01/30/90
4,896,495                   07/294,003                   01/30/90
4,896,496                   07/223,564                   01/30/90
4,896,505                   07/293,183                   01/30/90
4,896,514                   07/264,875                   01/30/90
4,896,520                   07/237,383                   01/30/90
4,896,527                   07/380,087                   01/30/90
4,896,528                   07/121,662                   01/30/90
4,896,530                   07/006,554                   01/30/90
4,896,532                   07/269,195                   01/30/90
4,896,545                   07/184,797                   01/30/90
4,896,547                   07/272,951                   01/30/90
4,896,553                   07/198,825                   01/30/90
4,896,554                   07/342,416                   01/30/90
4,896,555                   07/260,161                   01/30/90
4,896,559                   07/198,856                   01/30/90
4,896,567                   07/107,359                   01/30/90
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4,896,585                   07/187,388                   01/30/90
4,896,590                   07/327,048                   01/30/90
4,896,591                   07/273,970                   01/30/90
4,896,598                   07/316,480                   01/30/90
4,896,602                   07/213,618                   01/30/90
4,896,604                   07/145,318                   01/30/90
4,896,611                   07/266,874                   01/30/90
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4,896,632                   06/786,067                   01/30/90
4,896,635                   07/290,114                   01/30/90
4,896,645                   07/389,487                   01/30/90
4,896,646                   07/272,827                   01/30/90
4,896,657                   07/356,765                   01/30/90
4,896,660                   07/245,344                   01/30/90
4,896,668                   07/036,305                   01/30/90
4,896,672                   07/173,759                   01/30/90
4,896,676                   07/263,989                   01/30/90
4,896,679                   07/355,640                   01/30/90
4,896,682                   07/241,663                   01/30/90
4,896,685                   07/212,602                   01/30/90
4,896,689                   07/270,315                   01/30/90
4,896,691                   07/162,208                   01/30/90
4,896,694                   07/324,565                   01/30/90
4,896,698                   07/190,507                   01/30/90
4,896,700                   07/316,469                   01/30/90
4,896,703                   07/244,353                   01/30/90
4,896,711                   07/247,862                   01/30/90
4,896,713                   07/206,320                   01/30/90
4,896,718                   07/190,453                   01/30/90
4,896,724                   07/185,666                   01/30/90
4,896,727                   07/206,840                   01/30/90
4,896,728                   07/249,129                   01/30/90
4,896,729                   07/209,068                   01/30/90
4,896,733                   07/260,792                   01/30/90
4,896,735                   07/330,006                   01/30/90
4,896,737                   07/184,982                   01/30/90
4,896,740                   07/134,633                   01/30/90
4,896,747                   07/225,501                   01/30/90
4,896,749                   07/148,675                   01/30/90
4,896,750                   07/277,665                   01/30/90
4,896,755                   07/093,465                   01/30/90
4,896,757                   07/242,287                   01/30/90
4,896,759                   07/337,192                   01/30/90
4,896,768                   06/916,074                   01/30/90
4,896,771                   07/387,865                   01/30/90
4,896,780                   07/271,141                   01/30/90
4,896,785                   07/243,137                   01/30/90
4,896,788                   07/173,645                   01/30/90
4,896,791                   07/273,161                   01/30/90
4,896,792                   07/224,569                   01/30/90
4,896,795                   07/144,187                   01/30/90
4,896,798                   06/919,889                   01/30/90
4,896,801                   07/049,703                   01/30/90
4,896,802                   07/212,635                   01/30/90
4,896,805                   07/227,042                   01/30/90
4,896,807                   07/181,980                   01/30/90
4,896,814                   07/225,429                   01/30/90
4,896,817                   07/258,524                   01/30/90
4,896,819                   07/295,652                   01/30/90
4,896,824                   07/313,607                   01/30/90
4,896,834                   06/645,560                   01/30/90
4,896,839                   07/146,881                   01/30/90
4,896,840                   07/152,659                   01/30/90
4,896,841                   07/310,331                   01/30/90
4,896,847                   07/265,990                   01/30/90
4,896,851                   07/205,080                   01/30/90
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