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 19, 1995
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number             Serial Number                Issue Date

Re. 33,109                  07/179,223                   11/07/89
(4,656,305)                (07/789,277)                (04/07/87)
Re. 34,031                  07/532,224                   08/18/92
(4,656,142)                (06/798,984)                (04/07/87)
Re. 34,487                  07/822,437                   12/28/93
(5,005,735)                (07/194,803)                (04/09/91)
4,379,363                   06/257,220                   04/12/83
4,379,385                   06/265,645                   04/12/83
4,379,391                   06/270,353                   04/12/83
4,379,393                   06/243,997                   04/12/83
4,379,395                   06/234,405                   04/12/83
4,379,402                   06/227,332                   04/12/83
4,379,407                   06/259,775                   04/12/83
4,379,409                   06/299,049                   04/12/83
4,379,411                   06/234,304                   04/12/83
4,379,412                   06/332,705                   04/12/83
4,379,433                   06/302,404                   04/12/83
4,379,436                   06/294,474                   04/12/83
4,379,437                   06/294,769                   04/12/83
4,379,442                   06/299,253                   04/12/83
4,379,444                   06/253,423                   04/12/83
4,379,448                   06/350,564                   04/12/83
4,379,459                   06/252,537                   04/12/83
4,379,463                   06/253,047                   04/12/83
4,379,472                   06/282,908                   04/12/83
4,379,473                   06/236,526                   04/12/83
4,379,483                   06/293,185                   04/12/83
4,379,484                   06/224,709                   04/12/83
4,379,490                   06/256,430                   04/12/83
4,379,495                   06/258,212                   04/12/83
4,379,504                   06/216,711                   04/12/83
4,379,506                   06/250,239                   04/12/83
4,379,518                   06/293,824                   04/12/83
4,379,524                   06/245,166                   04/12/83
4,379,528                   06/254,565                   04/12/83
4,379,529                   06/237,149                   04/12/83
4,379,534                   06/239,305                   04/12/83
4,379,536                   06/241,673                   04/12/83
4,379,539                   06/217,783                   04/12/83
4,379,545                   06/241,436                   04/12/83
4,379,557                   06/240,700                   04/12/83
4,379,558                   06/259,454                   04/12/83
4,379,574                   06/218,836                   04/12/83
4,379,585                   06/252,148                   04/12/83
4,379,592                   06/223,242                   04/12/83
4,379,595                   06/277,741                   04/12/83
4,379,617                   06/251,903                   04/12/83
4,379,633                   06/282,036                   04/12/83
4,379,638                   06/252,358                   04/12/83
4,379,647                   06/297,037                   04/12/83
4,379,648                   06/225,028                   04/12/83
4,379,680                   06/274,787                   04/12/83
4,379,684                   06/272,679                   04/12/83
4,379,685                   06/288,405                   04/12/83
4,379,691                   06/310,960                   04/12/83
4,379,695                   06/267,609                   04/12/83
4,379,697                   06/312,094                   04/12/83
4,379,700                   06/264,467                   04/12/83
4,379,709                   06/274,388                   04/12/83
4,379,710                   06/235,969                   04/12/83
4,379,713                   06/131,331                   04/12/83
4,379,718                   06/264,496                   04/12/83
4,379,721                   06/241,523                   04/12/83
4,379,725                   06/346,503                   04/12/83
4,379,729                   06/253,845                   04/12/83
4,379,730                   06/323,942                   04/12/83
4,379,733                   06/307,986                   04/12/83
4,379,736                   06/333,604                   04/12/83
4,379,737                   06/322,456                   04/12/83
4,379,739                   06/259,316                   04/12/83
4,379,744                   06/299,917                   04/12/83
4,379,760                   06/320,650                   04/12/83
4,379,764                   06/300,416                   04/12/83
4,379,765                   06/286,122                   04/12/83
4,379,768                   06/296,363                   04/12/83
4,379,774                   06/303,775                   04/12/83
4,379,776                   06/282,465                   04/12/83
4,379,777                   06/310,726                   04/12/83
4,379,781                   06/241,809                   04/12/83
4,379,782                   06/309,536                   04/12/83
4,379,787                   06/307,985                   04/12/83
4,379,790                   06/337,355                   04/12/83
4,379,800                   06/374,098                   04/12/83
4,379,801                   06/370,318                   04/12/83
4,379,802                   06/370,319                   04/12/83
4,379,807                   06/243,587                   04/12/83
4,379,810                   06/409,151                   04/12/83
4,379,816                   06/313,312                   04/12/83
4,379,821                   06/269,941                   04/12/83
4,379,824                   06/255,294                   04/12/83
4,379,831                   06/261,164                   04/12/83
4,379,835                   06/218,559                   04/12/83
4,379,836                   06/295,641                   04/12/83
4,379,841                   06/308,210                   04/12/83
4,379,845                   06/286,111                   04/12/83
4,379,848                   06/306,621                   04/12/83
4,379,852                   06/241,235                   04/12/83
4,379,861                   06/325,539                   04/12/83
4,379,862                   06/282,219                   04/12/83
4,379,864                   06/240,739                   04/12/83
4,379,867                   06/290,438                   04/12/83
4,379,870                   06/279,235                   04/12/83
4,379,875                   06/221,751                   04/12/83
4,379,877                   06/314,648                   04/12/83
4,379,883                   06/289,847                   04/12/83
4,379,898                   06/233,267                   04/12/83
4,379,901                   06/306,352                   04/12/83
4,379,908                   06/355,082                   04/12/83
4,379,912                   06/407,401                   04/12/83
4,379,914                   06/332,813                   04/12/83
4,379,917                   06/334,409                   04/12/83
4,379,923                   06/297,214                   04/12/83
4,379,927                   06/349,416                   04/12/83
4,379,930                   06/301,686                   04/12/83
4,379,932                   06/332,174                   04/12/83
4,379,933                   06/332,175                   04/12/83
4,379,935                   06/288,419                   04/12/83
4,379,944                   06/232,062                   04/12/83
4,379,946                   06/265,484                   04/12/83
4,379,955                   06/353,831                   04/12/83
4,379,963                   06/222,704                   04/12/83
4,379,965                   06/252,643                   04/12/83
4,379,978                   06/245,796                   04/12/83
4,379,979                   06/232,444                   04/12/83
4,379,984                   06/250,011                   04/12/83
4,379,993                   06/220,932                   04/12/83
4,379,994                   06/244,175                   04/12/83
4,379,999                   06/316,905                   04/12/83
4,380,004                   06/245,593                   04/12/83
4,380,013                   06/234,830                   04/12/83
4,380,039                   06/310,242                   04/12/83
4,380,045                   06/290,698                   04/12/83
4,380,056                   06/236,415                   04/12/83
4,380,063                   06/272,143                   04/12/83
4,380,077                   06/232,543                   04/12/83
4,380,080                   06/221,248                   04/12/83
4,654,893                   06/779,103                   04/07/87
4,654,894                   06/885,682                   04/07/87
4,654,895                   06/896,849                   04/07/87
4,654,901                   06/767,762                   04/07/87
4,654,916                   06/705,338                   04/07/87
4,654,917                   06/745,672                   04/07/87
4,654,921                   06/820,423                   04/07/87
4,654,935                   06/679,737                   04/07/87
4,654,937                   06/817,477                   04/07/87
4,654,947                   06/803,325                   04/07/87
4,654,948                   06/803,331                   04/07/87
4,654,951                   06/827,124                   04/07/87
4,654,953                   06/646,992                   04/07/87
4,654,954                   06/660,133                   04/07/87
4,654,956                   06/725,415                   04/07/87
4,654,961                   06/703,903                   04/07/87
4,654,964                   06/816,438                   04/07/87
4,654,967                   06/770,029                   04/07/87
4,654,969                   06/862,966                   04/07/87
4,654,980                   06/721,942                   04/07/87
4,654,983                   06/813,752                   04/07/87
4,654,987                   06/773,634                   04/07/87
4,654,988                   06/724,012                   04/07/87
4,654,996                   06/864,087                   04/07/87
4,654,997                   06/890,339                   04/07/87
4,655,001                   06/786,687                   04/07/87
4,655,005                   06/864,267                   04/07/87
4,655,009                   06/775,837                   04/07/87
4,655,014                   06/702,040                   04/07/87
4,655,017                   06/795,545                   04/07/87
4,655,019                   06/779,704                   04/07/87
4,655,021                   06/791,103                   04/07/87
4,655,023                   06/693,977                   04/07/87
4,655,026                   06/807,754                   04/07/87
4,655,033                   06/825,142                   04/07/87
4,655,036                   06/837,368                   04/07/87
4,655,043                   06/827,981                   04/07/87
4,655,045                   06/819,856                   04/07/87
4,655,054                   06/717,382                   04/07/87
4,655,062                   06/456,865                   04/07/87
4,655,065                   06/820,729                   04/07/87
4,655,072                   06/798,087                   04/07/87
4,655,075                   06/830,436                   04/07/87
4,655,077                   06/739,899                   04/07/87
4,655,082                   06/761,043                   04/07/87
4,655,083                   06/845,272                   04/07/87
4,655,084                   06/858,105                   04/07/87
4,655,089                   06/797,980                   04/07/87
4,655,091                   06/594,166                   04/07/87
4,655,093                   06/755,459                   04/07/87
4,655,096                   06/646,420                   04/07/87
4,655,100                   06/645,872                   04/07/87
4,655,102                   06/784,997                   04/07/87
4,655,105                   06/646,898                   04/07/87
4,655,118                   06/801,625                   04/07/87
4,655,121                   06/800,775                   04/07/87
4,655,128                   06/762,285                   04/07/87
4,655,129                   06/787,211                   04/07/87
4,655,137                   06/831,768                   04/07/87
4,655,139                   06/655,702                   04/07/87
4,655,150                   06/871,404                   04/07/87
4,655,153                   06/716,558                   04/07/87
4,655,154                   06/822,997                   04/07/87
4,655,155                   06/695,510                   04/07/87
4,655,156                   06/701,997                   04/07/87
4,655,157                   06/720,290                   04/07/87
4,655,160                   06/873,269                   04/07/87
4,655,163                   06/807,103                   04/07/87
4,655,164                   06/804,391                   04/07/87
4,655,165                   06/796,872                   04/07/87
4,655,169                   06/833,645                   04/07/87
4,655,172                   06/727,095                   04/07/87
4,655,175                   06/822,500                   04/07/87
4,655,183                   06/775,125                   04/07/87
4,655,190                   06/827,033                   04/07/87
4,655,192                   06/734,938                   04/07/87
4,655,194                   06/852,134                   04/07/87
4,655,196                   06/865,764                   04/07/87
4,655,201                   06/630,648                   04/07/87
4,655,202                   06/639,914                   04/07/87
4,655,207                   06/789,742                   04/07/87
4,655,209                   06/859,425                   04/07/87
4,655,213                   06/539,723                   04/07/87
4,655,217                   06/786,658                   04/07/87
4,655,218                   06/786,246                   04/07/87
4,655,224                   06/806,067                   04/07/87
4,655,232                   06/641,711                   04/07/87
4,655,234                   06/740,538                   04/07/87
4,655,235                   06/661,986                   04/07/87
4,655,239                   06/866,627                   04/07/87
4,655,244                   06/807,267                   04/07/87
4,655,254                   06/810,844                   04/07/87
4,655,258                   06/825,135                   04/07/87
4,655,266                   06/759,417                   04/07/87
4,655,268                   06/833,171                   04/07/87
4,655,271                   06/850,102                   04/07/87
4,655,276                   06/869,260                   04/07/87
4,655,283                   06/876,631                   04/07/87
4,655,290                   06/809,356                   04/07/87
4,655,291                   06/778,790                   04/07/87
4,655,292                   06/886,012                   04/07/87
4,655,294                   06/700,390                   04/07/87
4,655,298                   06/773,773                   04/07/87
4,655,300                   06/781,198                   04/07/87
4,655,301                   06/797,890                   04/07/87
4,655,303                   06/801,178                   04/07/87
4,655,307                   06/731,104                   04/07/87
4,655,314                   06/830,340                   04/07/87
4,655,315                   06/755,785                   04/07/87
4,655,317                   06/734,649                   04/07/87
4,655,320                   06/807,340                   04/07/87
4,655,323                   06/816,132                   04/07/87
4,655,327                   06/666,764                   04/07/87
4,655,328                   06/708,990                   04/07/87
4,655,341                   06/721,314                   04/07/87
4,655,345                   06/797,911                   04/07/87
4,655,347                   06/854,054                   04/07/87
4,655,357                   06/820,630                   04/07/87
4,655,358                   06/242,325                   04/07/87
4,655,359                   06/863,302                   04/07/87
4,655,364                   06/815,851                   04/07/87
4,655,366                   06/871,370                   04/07/87
4,655,370                   06/681,000                   04/07/87
4,655,374                   06/713,670                   04/07/87
4,655,375                   06/761,474                   04/07/87
4,655,376                   06/810,214                   04/07/87
4,655,384                   06/789,209                   04/07/87
4,655,385                   06/816,156                   04/07/87
4,655,390                   06/904,455                   04/07/87
4,655,394                   06/683,648                   04/07/87
4,655,395                   06/600,623                   04/07/87
4,655,397                   06/687,559                   04/07/87
4,655,398                   06/808,384                   04/07/87
4,655,401                   06/768,495                   04/07/87
4,655,403                   06/720,598                   04/07/87
4,655,405                   06/736,698                   04/07/87
4,655,408                   06/842,368                   04/07/87
4,655,417                   06/655,892                   04/07/87
4,655,420                   06/502,818                   04/07/87
4,655,421                   06/674,928                   04/07/87
4,655,425                   06/800,712                   04/07/87
4,655,427                   06/787,163                   04/07/87
4,655,430                   06/694,558                   04/07/87
4,655,432                   06/738,538                   04/07/87
4,655,435                   06/686,297                   04/07/87
4,655,438                   06/812,835                   04/07/87
4,655,441                   06/800,795                   04/07/87
4,655,449                   06/772,014                   04/07/87
4,655,450                   06/639,721                   04/07/87
4,655,457                   06/785,748                   04/07/87
4,655,459                   06/804,394                   04/07/87
4,655,464                   06/736,473                   04/07/87
4,655,465                   06/803,602                   04/07/87
4,655,467                   06/713,699                   04/07/87
4,655,468                   06/839,116                   04/07/87
4,655,474                   06/852,568                   04/07/87
4,655,475                   06/782,622                   04/07/87
4,655,476                   06/802,254                   04/07/87
4,655,477                   06/811,947                   04/07/87
4,655,478                   06/765,721                   04/07/87
4,655,481                   06/744,835                   04/07/87
4,655,482                   06/853,361                   04/07/87
4,655,485                   06/831,050                   04/07/87
4,655,490                   06/812,331                   04/07/87
4,655,492                   06/787,629                   04/07/87
4,655,493                   06/810,062                   04/07/87
4,655,495                   06/889,706                   04/07/87
4,655,498                   06/863,231                   04/07/87
4,655,499                   06/704,483                   04/07/87
4,655,500                   06/795,095                   04/07/87
4,655,502                   06/676,325                   04/07/87
4,655,503                   06/682,595                   04/07/87
4,655,504                   06/759,867                   04/07/87
4,655,509                   06/873,849                   04/07/87
4,655,513                   06/750,883                   04/07/87
4,655,521                   06/798,860                   04/07/87
4,655,523                   06/754,434                   04/07/87
4,655,536                   06/786,574                   04/07/87
4,655,543                   06/731,848                   04/07/87
4,655,546                   06/586,089                   04/07/87
4,655,547                   06/721,320                   04/07/87
4,655,554                   06/708,926                   04/07/87
4,655,562                   06/723,117                   04/07/87
4,655,564                   06/667,966                   04/07/87
4,655,566                   06/880,149                   04/07/87
4,655,570                   06/789,570                   04/07/87
4,655,574                   06/818,163                   04/07/87
4,655,575                   06/841,772                   04/07/87
4,655,579                   06/768,955                   04/07/87
4,655,588                   06/704,816                   04/07/87
4,655,589                   06/698,598                   04/07/87
4,655,591                   06/822,955                   04/07/87
4,655,593                   06/697,524                   04/07/87
4,655,602                   06/810,508                   04/07/87
4,655,604                   06/765,991                   04/07/87
4,655,607                   06/793,496                   04/07/87
4,655,609                   06/823,675                   04/07/87
4,655,612                   06/831,145                   04/07/87
4,655,621                   06/643,007                   04/07/87
4,655,623                   06/807,409                   04/07/87
4,655,627                   06/735,455                   04/07/87
4,655,628                   06/837,299                   04/07/87
4,655,630                   06/815,159                   04/07/87
4,655,631                   06/699,529                   04/07/87
4,655,634                   06/778,867                   04/07/87
4,655,637                   06/746,999                   04/07/87
4,655,642                   06/697,239                   04/07/87
4,655,643                   06/648,963                   04/07/87
4,655,647                   06/730,383                   04/07/87
4,655,650                   06/782,948                   04/07/87
4,655,652                   06/592,179                   04/07/87
4,655,653                   06/652,001                   04/07/87
4,655,655                   06/775,180                   04/07/87
4,655,656                   06/897,874                   04/07/87
4,655,659                   06/808,220                   04/07/87
4,655,660                   06/704,124                   04/07/87
4,655,664                   06/696,043                   04/07/87
4,655,665                   06/698,628                   04/07/87
4,655,670                   06/671,895                   04/07/87
4,655,674                   06/636,924                   04/07/87
4,655,675                   06/571,970                   04/07/87
4,655,676                   06/629,481                   04/07/87
4,655,677                   06/809,038                   04/07/87
4,655,681                   06/744,725                   04/07/87
4,655,686                   06/767,050                   04/07/87
4,655,689                   06/778,208                   04/07/87
4,655,698                   06/759,567                   04/07/87
4,655,702                   06/771,711                   04/07/87
4,655,706                   06/775,824                   04/07/87
4,655,711                   06/865,280                   04/07/87
4,655,712                   06/761,491                   04/07/87
4,655,715                   06/805,863                   04/07/87
4,655,717                   06/561,748                   04/07/87
4,655,718                   06/789,380                   04/07/87
4,655,719                   06/788,042                   04/07/87
4,655,721                   06/710,056                   04/07/87
4,655,725                   06/786,558                   04/07/87
4,655,728                   06/725,541                   04/07/87
4,655,729                   06/625,601                   04/07/87
4,655,731                   06/742,728                   04/07/87
4,655,733                   06/783,439                   04/07/87
4,655,734                   06/750,286                   04/07/87
4,655,738                   06/740,267                   04/07/87
4,655,739                   06/599,524                   04/07/87
4,655,743                   06/730,803                   04/07/87
4,655,744                   06/804,219                   04/07/87
4,655,745                   06/760,168                   04/07/87
4,655,750                   06/800,817                   04/07/87
4,655,755                   06/790,098                   04/07/87
4,655,763                   06/605,584                   04/07/87
4,655,768                   06/788,086                   04/07/87
4,655,773                   06/746,970                   04/07/87
4,655,774                   06/841,264                   04/07/87
4,655,777                   06/563,191                   04/07/87
4,655,779                   06/793,217                   04/07/87
4,655,780                   06/815,423                   04/07/87
4,655,782                   06/805,531                   04/07/87
4,655,786                   06/669,415                   04/07/87
4,655,787                   06/731,526                   04/07/87
4,655,791                   06/714,885                   04/07/87
4,655,795                   06/470,129                   04/07/87
4,655,796                   06/537,850                   04/07/87
4,655,797                   06/649,044                   04/07/87
4,655,801                   06/766,105                   04/07/87
4,655,802                   06/601,151                   04/07/87
4,655,805                   06/800,128                   04/07/87
4,655,806                   06/812,133                   04/07/87
4,655,807                   06/829,868                   04/07/87
4,655,809                   06/818,416                   04/07/87
4,655,814                   06/742,535                   04/07/87
4,655,817                   06/756,538                   04/07/87
4,655,818                   06/713,690                   04/07/87
4,655,821                   06/754,141                   04/07/87
4,655,822                   06/671,875                   04/07/87
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