Notice of Expiration of Patents
                    Due to Failure to Pay Maintenance Fees

   35 U.S.C. 41 AND 37 CFR 1.362(g) provide that if the required
maintenance 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 applicable surcharge.

                     PATENTS WHICH EXPIRED April 26, 1995
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number                Issue Date

Re. 33,222                  07/340,854                   05/29/90
(4,658,760)                (06/745,444)                (04/21/87)
Re. 33,304                  07/341,745                   08/21/90
(4,659,107)                (06/662,903)                (04/21/87)
Re. 33,590                  07/276,431                   05/21/91
(4,658,828)                (06/728,905)                (04/21/87)
Re. 33,646                  07/340,537                   07/23/91
(4,659,496)                (06/698,043)                (04/21/87)
Re. 33,984                  07/740,782                   07/07/92
(5,009,301)                (07/531,612)                (04/23/91)
Re. 34,481                  07/641,604                   12/21/93
(4,658,691)                (06/788,669)                (04/21/87)
4,380,837                   06/249,747                   04/26/83
4,380,839                   06/278,211                   04/26/83
4,380,840                   06/335,725                   04/26/83
4,380,845                   06/245,892                   04/26/83
4,380,849                   06/244,735                   04/26/83
4,380,859                   06/223,058                   04/26/83
4,380,864                   06/286,821                   04/26/83
4,380,873                   06/242,865                   04/26/83
4,380,890                   06/290,518                   04/26/83
4,380,900                   06/267,322                   04/26/83
4,380,903                   06/247,434                   04/26/83
4,380,907                   06/281,737                   04/26/83
4,380,909                   06/284,379                   04/26/83
4,380,910                   06/292,367                   04/26/83
4,380,915                   06/251,155                   04/26/83
4,380,927                   06/285,504                   04/26/83
4,380,930                   06/259,773                   04/26/83
4,380,943                   06/265,509                   04/26/83
4,380,945                   06/228,261                   04/26/83
4,380,947                   06/272,334                   04/26/83
4,380,955                   06/247,315                   04/26/83
4,380,956                   06/300,359                   04/26/83
4,380,974                   06/247,031                   04/26/83
4,380,984                   06/278,396                   04/26/83
4,380,994                   06/377,663                   04/26/83
4,380,996                   06/259,141                   04/26/83
4,381,004                   06/225,309                   04/26/83
4,381,020                   06/288,325                   04/26/83
4,381,025                   06/333,254                   04/26/83
4,381,026                   06/224,374                   04/26/83
4,381,029                   06/298,552                   04/26/83
4,381,032                   06/256,841                   04/26/83
4,381,033                   06/250,541                   04/26/83
4,381,047                   06/281,359                   04/26/83
4,381,048                   06/302,192                   04/26/83
4,381,051                   06/238,677                   04/26/83
4,381,054                   06/223,936                   04/26/83
4,381,061                   06/266,783                   04/26/83
4,381,062                   06/248,503                   04/26/83
4,381,065                   06/268,262                   04/26/83
4,381,066                   06/376,570                   04/26/83
4,381,074                   06/317,865                   04/26/83
4,381,085                   06/251,614                   04/26/83
4,381,092                   06/259,777                   04/26/83
4,381,094                   06/223,271                   04/26/83
4,381,120                   06/256,509                   04/26/83
4,381,124                   06/223,896                   04/26/83
4,381,128                   06/236,008                   04/26/83
4,381,144                   06/283,557                   04/26/83
4,381,148                   06/246,350                   04/26/83
4,381,158                   06/220,988                   04/26/83
4,381,168                   06/225,830                   04/26/83
4,381,170                   06/293,183                   04/26/83
4,381,176                   06/292,461                   04/26/83
4,381,179                   06/272,989                   04/26/83
4,381,186                   06/244,923                   04/26/83
4,381,187                   06/325,413                   04/26/83
4,381,189                   06/315,418                   04/26/83
4,381,192                   06/258,316                   04/26/83
4,381,194                   06/232,647                   04/26/83
4,381,195                   06/255,590                   04/26/83
4,381,196                   06/255,924                   04/26/83
4,381,199                   06/312,013                   04/26/83
4,381,200                   06/249,037                   04/26/83
4,381,201                   06/240,130                   04/26/83
4,381,202                   06/247,376                   04/26/83
4,381,203                   06/325,565                   04/26/83
4,381,204                   06/328,050                   04/26/83
4,381,210                   06/238,270                   04/26/83
4,381,213                   06/216,873                   04/26/83
4,381,216                   06/289,579                   04/26/83
4,381,217                   06/317,637                   04/26/83
4,381,219                   06/368,909                   04/26/83
4,381,220                   06/331,205                   04/26/83
4,381,224                   06/258,185                   04/26/83
4,381,226                   06/333,585                   04/26/83
4,381,229                   06/319,120                   04/26/83
4,381,230                   06/276,095                   04/26/83
4,381,231                   06/321,510                   04/26/83
4,381,237                   06/285,107                   04/26/83
4,381,246                   06/306,006                   04/26/83
4,381,248                   06/293,872                   04/26/83
4,381,250                   06/344,911                   04/26/83
4,381,253                   06/313,542                   04/26/83
4,381,254                   06/335,311                   04/26/83
4,381,255                   06/225,075                   04/26/83
4,381,256                   06/225,076                   04/26/83
4,381,257                   06/301,069                   04/26/83
4,381,258                   06/321,074                   04/26/83
4,381,260                   06/284,388                   04/26/83
4,381,262                   06/349,574                   04/26/83
4,381,265                   06/286,731                   04/26/83
4,381,271                   06/230,219                   04/26/83
4,381,278                   06/331,507                   04/26/83
4,381,283                   06/279,396                   04/26/83
4,381,284                   06/217,059                   04/26/83
4,381,290                   06/344,304                   04/26/83
4,381,297                   06/260,659                   04/26/83
4,381,318                   06/289,465                   04/26/83
4,381,323                   06/358,384                   04/26/83
4,381,328                   06/301,221                   04/26/83
4,381,333                   06/308,007                   04/26/83
4,381,334                   06/283,917                   04/26/83
4,381,339                   06/252,572                   04/26/83
4,381,340                   06/298,051                   04/26/83
4,381,341                   06/344,467                   04/26/83
4,381,342                   06/258,154                   04/26/83
4,381,343                   06/248,408                   04/26/83
4,381,345                   06/261,996                   04/26/83
4,381,347                   06/281,143                   04/26/83
4,381,357                   06/304,185                   04/26/83
4,381,360                   06/225,064                   04/26/83
4,381,361                   06/315,620                   04/26/83
4,381,362                   06/295,188                   04/26/83
4,381,363                   06/300,838                   04/26/83
4,381,371                   06/302,567                   04/26/83
4,381,373                   06/323,078                   04/26/83
4,381,382                   06/269,233                   04/26/83
4,381,384                   06/293,333                   04/26/83
4,381,385                   06/227,483                   04/26/83
4,381,390                   06/311,360                   04/26/83
4,381,391                   06/239,961                   04/26/83
4,381,392                   06/247,206                   04/26/83
4,381,399                   06/332,644                   04/26/83
4,381,401                   06/309,959                   04/26/83
4,381,404                   06/306,070                   04/26/83
4,381,409                   06/301,979                   04/26/83
4,381,410                   06/231,791                   04/26/83
4,381,414                   06/261,256                   04/26/83
4,381,415                   06/368,177                   04/26/83
4,381,431                   06/257,258                   04/26/83
4,381,437                   06/223,404                   04/26/83
4,381,438                   06/270,141                   04/26/83
4,381,453                   06/221,661                   04/26/83
4,381,456                   06/245,684                   04/26/83
4,381,459                   06/305,559                   04/26/83
4,381,461                   06/224,860                   04/26/83
4,381,465                   06/274,377                   04/26/83
4,381,468                   06/274,380                   04/26/83
4,381,470                   06/219,633                   04/26/83
4,381,477                   06/314,937                   04/26/83
4,381,479                   06/225,227                   04/26/83
4,381,487                   06/319,494                   04/26/83
4,381,488                   06/235,514                   04/26/83
4,381,500                   06/233,647                   04/26/83
4,381,502                   06/278,778                   04/26/83
4,381,510                   06/294,046                   04/26/83
4,381,520                   06/269,126                   04/26/83
4,381,521                   06/337,747                   04/26/83
4,381,531                   06/280,161                   04/26/83
4,381,535                   06/241,002                   04/26/83
4,381,538                   06/310,445                   04/26/83
4,381,539                   06/266,146                   04/26/83
4,381,563                   06/217,966                   04/26/83
4,658,441                   06/808,632                   04/21/87
4,658,445                   06/877,787                   04/21/87
4,658,447                   06/748,055                   04/21/87
4,658,449                   06/777,748                   04/21/87
4,658,452                   06/661,906                   04/21/87
4,658,453                   06/851,106                   04/21/87
4,658,455                   06/853,222                   04/21/87
4,658,456                   06/788,128                   04/21/87
4,658,457                   06/852,722                   04/21/87
4,658,461                   06/783,140                   04/21/87
4,658,462                   06/838,911                   04/21/87
4,658,467                   06/815,939                   04/21/87
4,658,470                   06/788,647                   04/21/87
4,658,471                   06/804,300                   04/21/87
4,658,472                   06/892,470                   04/21/87
4,658,476                   06/675,803                   04/21/87
4,658,482                   06/769,412                   04/21/87
4,658,483                   06/727,679                   04/21/87
4,658,484                   06/785,891                   04/21/87
4,658,493                   06/762,836                   04/21/87
4,658,503                   06/646,949                   04/21/87
4,658,512                   06/652,891                   04/21/87
4,658,513                   06/771,697                   04/21/87
4,658,516                   06/841,243                   04/21/87
4,658,517                   06/821,483                   04/21/87
4,658,518                   06/572,395                   04/21/87
4,658,521                   06/837,042                   04/21/87
4,658,524                   06/692,779                   04/21/87
4,658,525                   06/557,456                   04/21/87
4,658,526                   06/628,458                   04/21/87
4,658,531                   06/830,123                   04/21/87
4,658,540                   06/767,585                   04/21/87
4,658,541                   06/826,441                   04/21/87
4,658,547                   06/769,812                   04/21/87
4,658,550                   06/743,430                   04/21/87
4,658,551                   06/725,308                   04/21/87
4,658,552                   06/682,163                   04/21/87
4,658,555                   06/754,459                   04/21/87
4,658,556                   06/642,143                   04/21/87
4,658,557                   06/682,169                   04/21/87
4,658,561                   06/737,487                   04/21/87
4,658,565                   06/839,073                   04/21/87
4,658,572                   06/745,248                   04/21/87
4,658,574                   06/817,576                   04/21/87
4,658,575                   06/651,717                   04/21/87
4,658,580                   06/782,387                   04/21/87
4,658,583                   06/619,291                   04/21/87
4,658,585                   06/906,560                   04/21/87
4,658,587                   06/767,988                   04/21/87
4,658,588                   06/617,986                   04/21/87
4,658,591                   06/770,301                   04/21/87
4,658,598                   06/851,124                   04/21/87
4,658,599                   06/808,688                   04/21/87
4,658,602                   06/812,891                   04/21/87
4,658,604                   06/894,096                   04/21/87
4,658,605                   06/709,374                   04/21/87
4,658,608                   06/670,283                   04/21/87
4,658,619                   06/842,094                   04/21/87
4,658,622                   06/796,862                   04/21/87
4,658,629                   06/770,864                   04/21/87
4,658,630                   06/787,557                   04/21/87
4,658,635                   06/838,612                   04/21/87
4,658,637                   06/790,592                   04/21/87
4,658,642                   06/606,969                   04/21/87
4,658,644                   06/779,931                   04/21/87
4,658,645                   06/827,709                   04/21/87
4,658,646                   06/783,401                   04/21/87
4,658,647                   06/745,642                   04/21/87
4,658,648                   06/763,810                   04/21/87
4,658,649                   06/741,699                   04/21/87
4,658,651                   06/732,946                   04/21/87
4,658,662                   06/867,939                   04/21/87
4,658,668                   06/649,110                   04/21/87
4,658,671                   06/622,747                   04/21/87
4,658,675                   06/578,930                   04/21/87
4,658,677                   06/753,038                   04/21/87
4,658,687                   06/785,429                   04/21/87
4,658,693                   06/856,838                   04/21/87
4,658,694                   06/769,454                   04/21/87
4,658,696                   06/671,912                   04/21/87
4,658,697                   06/890,921                   04/21/87
4,658,698                   06/716,842                   04/21/87
4,658,703                   06/717,776                   04/21/87
4,658,707                   06/781,144                   04/21/87
4,658,710                   06/822,398                   04/21/87
4,658,714                   06/792,578                   04/21/87
4,659,717                   06/792,189                   04/21/87
4,658,724                   06/779,143                   04/21/87
4,658,727                   06/655,703                   04/21/87
4,658,728                   06/790,809                   04/21/87
4,658,729                   06/652,405                   04/21/87
4,658,731                   06/882,013                   04/21/87
4,658,733                   06/766,710                   04/21/87
4,658,734                   06/710,368                   04/21/87
4,658,741                   06/884,402                   04/21/87
4,658,742                   06/662,403                   04/21/87
4,658,745                   06/276,099                   04/21/87
4,658,746                   06/763,993                   04/21/87
4,658,750                   06/806,386                   04/21/87
4,658,754                   06/744,006                   04/21/87
4,658,758                   06/844,851                   04/21/87
4,658,759                   06/754,011                   04/21/87
4,658,764                   06/770,989                   04/21/87
4,658,765                   06/852,158                   04/21/87
4,658,766                   06/779,396                   04/21/87
4,658,770                   06/781,120                   04/21/87
4,658,776                   06/825,641                   04/21/87
4,658,784                   06/744,994                   04/21/87
4,658,785                   06/767,634                   04/21/87
4,658,792                   06/725,671                   04/21/87
4,658,797                   06/683,863                   04/21/87
4,658,801                   06/849,496                   04/21/87
4,658,802                   06/729,720                   04/21/87
4,658,805                   06/649,424                   04/21/87
4,658,807                   06/436,649                   04/21/87
4,658,810                   06/726,911                   04/21/87
4,658,815                   06/819,468                   04/21/87
4,658,824                   06/763,822                   04/21/87
4,658,838                   06/808,989                   04/21/87
4,658,840                   06/238,752                   04/21/87
4,658,841                   06/758,438                   04/21/87
4,658,843                   06/788,060                   04/21/87
4,658,846                   06/903,508                   04/21/87
4,658,849                   06/746,654                   04/21/87
4,658,850                   06/800,482                   04/21/87
4,658,858                   06/791,955                   04/21/87
4,658,859                   06/679,212                   04/21/87
4,658,862                   06/736,784                   04/21/87
4,658,863                   06/838,913                   04/21/87
4,658,868                   06/275,878                   04/21/87
4,658,869                   06/860,611                   04/21/87
4,658,876                   06/758,188                   04/21/87
4,658,877                   06/710,604                   04/21/87
4,658,879                   06/646,647                   04/21/87
4,658,881                   06/835,450                   04/21/87
4,658,883                   06/727,420                   04/21/87
4,658,884                   06/709,499                   04/21/87
4,658,895                   06/841,491                   04/21/87
4,658,900                   06/742,096                   04/21/87
4,658,906                   06/796,804                   04/21/87
4,658,918                   06/758,888                   04/21/87
4,658,919                   06/668,894                   04/21/87
4,658,923                   06/660,847                   04/21/87
4,658,924                   06/867,522                   04/21/87
4,658,926                   06/700,151                   04/21/87
4,658,932                   06/830,468                   04/21/87
4,658,936                   06/758,945                   04/21/87
4,658,938                   06/738,033                   04/21/87
4,658,942                   06/599,803                   04/21/87
4,658,944                   06/726,080                   04/21/87
4,658,950                   06/803,776                   04/21/87
4,658,952                   06/626,455                   04/21/87
4,658,957                   06/859,968                   04/21/87
4,658,966                   06/845,515                   04/21/87
4,658,972                   06/624,914                   04/21/87
4,658,979                   06/818,563                   04/21/87
4,658,982                   06/593,042                   04/21/87
4,658,986                   06/754,338                   04/21/87
4,658,992                   06/843,847                   04/21/87
4,658,996                   06/774,903                   04/21/87
4,658,997                   06/833,983                   04/21/87
4,658,998                   06/766,120                   04/21/87
4,658,999                   06/750,748                   04/21/87
4,659,001                   06/599,176                   04/21/87
4,659,002                   06/763,704                   04/21/87
4,659,004                   06/649,065                   04/21/87
4,659,005                   06/641,705                   04/21/87
4,659,010                   06/702,205                   04/21/87
4,659,012                   06/726,891                   04/21/87
4,659,014                   06/772,753                   04/21/87
4,659,017                   06/786,648                   04/21/87
4,659,018                   06/739,939                   04/21/87
4,659,020                   06/790,022                   04/21/87
4,659,022                   06/795,188                   04/21/87
4,659,024                   06/789,897                   04/21/87
4,659,026                   06/824,747                   04/21/87
4,659,030                   06/786,570                   04/21/87
4,659,032                   06/768,153                   04/21/87
4,659,033                   06/626,101                   04/21/87
4,659,035                   06/695,103                   04/21/87
4,659,036                   06/535,422                   04/21/87
4,659,040                   06/700,882                   04/21/87
4,659,042                   06/622,108                   04/21/87
4,659,043                   06/609,938                   04/21/87
4,659,044                   06/781,066                   04/21/87
4,659,049                   06/800,423                   04/21/87
4,659,054                   06/665,168                   04/21/87
4,659,055                   06/806,407                   04/21/87
4,659,057                   06/748,931                   04/21/87
4,659,065                   06/694,159                   04/21/87
4,659,067                   06/774,586                   04/21/87
4,659,068                   06/868,894                   04/21/87
4,659,069                   06/714,188                   04/21/87
4,659,073                   06/553,846                   04/21/87
4,659,077                   06/781,668                   04/21/87
4,659,080                   06/505,779                   04/21/87
4,659,084                   06/766,911                   04/21/87
4,659,088                   06/725,395                   04/21/87
4,659,090                   06/767,914                   04/21/87
4,659,092                   06/735,083                   04/21/87
4,659,102                   06/797,713                   04/21/87
4,659,105                   06/819,666                   04/21/87
4,659,111                   06/778,892                   04/21/87
4,659,114                   06/521,518                   04/21/87
4,659,119                   06/566,572                   04/21/87
4,659,123                   06/835,721                   04/21/87
4,659,124                   06/823,457                   04/21/87
4,659,125                   06/737,345                   04/21/87
4,659,127                   06/834,398                   04/21/87
4,659,130                   06/555,021                   04/21/87
4,659,136                   06/862,327                   04/21/87
4,659,138                   06/776,767                   04/21/87
4,659,142                   06/868,523                   04/21/87
4,659,144                   06/748,576                   04/21/87
4,659,145                   06/679,086                   04/21/87
4,659,147                   06/794,050                   04/21/87
4,659,150                   06/760,561                   04/21/87
4,659,153                   06/776,418                   04/21/87
4,659,154                   06/647,702                   04/21/87
4,659,159                   06/706,270                   04/21/87
4,659,160                   06/563,558                   04/21/87
4,659,168                   06/647,956                   04/21/87
4,659,169                   06/706,902                   04/21/87
4,659,172                   06/736,230                   04/21/87
4,659,177                   06/797,465                   04/21/87
4,659,182                   06/705,568                   04/21/87
4,659,185                   06/831,673                   04/21/87
4,659,190                   06/718,705                   04/21/87
4,659,195                   06/824,846                   04/21/87
4,659,199                   06/802,586                   04/21/87
4,659,205                   06/483,247                   04/21/87
4,659,207                   06/757,783                   04/21/87
4,659,232                   06/704,495                   04/21/87
4,659,233                   06/599,151                   04/21/87
4,659,242                   06/301,971                   04/21/87
4,659,247                   06/783,543                   04/21/87
4,659,250                   06/758,026                   04/21/87
4,659,253                   06/721,843                   04/21/87
4,659,254                   06/766,131                   04/21/87
4,659,259                   06/658,959                   04/21/87
4,659,260                   06/855,327                   04/21/87
4,659,262                   06/707,700                   04/21/87
4,659,270                   06/809,945                   04/21/87
4,659,271                   06/768,168                   04/21/87
4,659,272                   06/884,875                   04/21/87
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