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 MARCH 15, 1995
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number                Issue Date

Re. 33,173                  07/200,530                   02/27/90
(4,648,860)                (06/703,822)                (03/10/87)
4,376,315                   06/278,259                   03/15/83
4,376,326                   06/281,310                   03/15/83
4,376,338                   06/291,522                   03/15/83
4,376,340                   06/261,679                   03/15/83
4,376,347                   06/303,500                   03/15/83
4,376,350                   06/226,930                   03/15/83
4,376,380                   06/226,717                   03/15/83
4,376,407                   06/217,596                   03/15/83
4,376,411                   06/353,287                   03/15/83
4,376,414                   06/260,686                   03/15/83
4,376,415                   06/259,143                   03/15/83
4,376,423                   06/271,363                   03/15/83
4,376,426                   06/216,181                   03/15/83
4,376,443                   06/295,296                   03/15/83
4,376,445                   06/287,430                   03/15/83
4,376,457                   06/357,906                   03/15/83
4,376,463                   06/293,754                   03/15/83
4,376,466                   06/250,078                   03/15/83
4,376,471                   06/226,906                   03/15/83
4,376,473                   06/247,704                   03/15/83
4,376,480                   06/233,583                   03/15/83
4,376,483                   06/221,414                   03/15/83
4,376,484                   06/245,955                   03/15/83
4,376,486                   06/226,747                   03/15/83
4,376,499                   06/296,838                   03/15/83
4,376,501                   06/254,149                   03/15/83
4,376,511                   06/249,897                   03/15/83
4,376,519                   06/271,867                   03/15/83
4,376,537                   06/221,292                   03/15/83
4,376,540                   06/326,343                   03/15/83
4,376,543                   06/268,402                   03/15/83
4,376,552                   06/231,154                   03/15/83
4,376,553                   06/233,257                   03/15/83
4,376,560                   06/216,727                   03/15/83
4,376,562                   06/226,264                   03/15/83
4,376,566                   06/323,531                   03/15/83
4,376,572                   06/229,419                   03/15/83
4,376,577                   06/237,947                   03/15/83
4,376,585                   06/250,116                   03/15/83
4,376,587                   06/289,584                   03/15/83
4,376,600                   06/261,549                   03/15/83
4,376,612                   06/263,097                   03/15/83
4,376,628                   06/230,948                   03/15/83
4,376,632                   06/335,419                   03/15/83
4,376,634                   06/241,859                   03/15/83
4,376,638                   06/310,132                   03/15/83
4,376,639                   06/329,144                   03/15/83
4,376,640                   06/329,145                   03/15/83
4,376,641                   06/330,343                   03/15/83
4,376,645                   06/322,674                   03/15/83
4,376,653                   06/347,197                   03/15/83
4,376,659                   06/292,755                   03/15/83
4,376,683                   06/249,028                   03/15/83
4,376,684                   06/295,714                   03/15/83
4,376,692                   06/215,805                   03/15/83
4,376,693                   06/282,769                   03/15/83
4,376,694                   06/281,344                   03/15/83
4,376,695                   06/256,855                   03/15/83
4,376,696                   06/246,751                   03/15/83
4,376,702                   06/237,121                   03/15/83
4,376,708                   06/262,249                   03/15/83
4,376,710                   06/249,243                   03/15/83
4,376,723                   06/274,135                   03/15/83
4,376,726                   06/244,322                   03/15/83
4,376,727                   06/225,182                   03/15/83
4,376,732                   06/281,611                   03/15/83
4,376,734                   06/319,912                   03/15/83
4,376,738                   06/301,153                   03/15/83
4,376,744                   06/323,725                   03/15/83
4,376,748                   06/276,370                   03/15/83
4,376,751                   06/268,425                   03/15/83
4,376,759                   06/233,177                   03/15/83
4,376,761                   06/281,800                   03/15/83
4,376,762                   06/307,272                   03/15/83
4,376,763                   06/307,273                   03/15/83
4,376,765                   06/249,487                   03/15/83
4,376,767                   06/222,030                   03/15/83
4,376,768                   06/274,229                   03/15/83
4,376,771                   06/224,939                   03/15/83
4,376,773                   06/237,964                   03/15/83
4,376,778                   06/218,975                   03/15/83
4,376,785                   06/272,045                   03/15/83
4,376,789                   06/240,606                   03/15/83
4,376,790                   06/232,492                   03/15/83
4,376,796                   06/315,572                   03/15/83
4,376,797                   06/289,646                   03/15/83
4,376,800                   06/253,481                   03/15/83
4,376,801                   06/379,616                   03/15/83
4,376,803                   06/296,957                   03/15/83
4,376,804                   06/296,958                   03/15/83
4,376,814                   06/359,455                   03/15/83
4,376,816                   06/276,870                   03/15/83
4,376,817                   06/287,323                   03/15/83
4,376,820                   06/351,582                   03/15/82
4,376,821                   06/255,138                   03/15/83
4,376,822                   06/255,139                   03/15/83
4,376,830                   06/291,587                   03/15/83
4,376,831                   06/364,570                   03/15/83
4,376,836                   06/282,504                   03/15/83
4,376,842                   06/233,794                   03/15/83
4,376,843                   06/270,802                   03/15/83
4,376,853                   06/355,080                   03/15/83
4,376,854                   06/365,790                   03/15/83
4,376,864                   06/320,131                   03/15/83
4,376,867                   06/280,965                   03/15/83
4,376,872                   06/359,388                   03/15/83
4,376,873                   06/261,607                   03/15/83
4,376,878                   06/284,537                   03/15/83
4,376,879                   06/315,044                   03/15/83
4,376,881                   06/227,047                   03/15/83
4,376,894                   06/344,700                   03/15/83
4,376,905                   06/231,237                   03/15/83
4,376,910                   06/247,538                   03/15/83
4,376,914                   06/242,239                   03/15/83
4,376,921                   06/258,348                   03/15/83
4,376,923                   06/240,286                   03/15/83
4,376,924                   06/385,130                   03/15/83
4,376,927                   06/268,011                   03/15/83
4,376,930                   06/228,351                   03/15/83
4,376,961                   06/269,672                   03/15/83
4,376,968                   06/234,t42                   03/15/83
4,376,969                   06/242,783                   03/15/83
4,376,970                   06/218,488                   03/15/83
4,376,989                   06/247,283                   03/15/83
4,377,001                   06/234,470                   03/15/83
4,377,002                   06/288,938                   03/15/83
4,648,138                   06/763,403                   03/10/87
4,648,142                   06/660,716                   03/10/87
4,648,143                   06/740,879                   03/10/87
4,648,152                   06/818,392                   03/10/87
4,648,155                   06/840,731                   03/10/87
4,648,156                   06/751,036                   03/10/87
4,648,157                   06/587,256                   03/10/87
4,648,163                   06/766,696                   03/10/87
4,648,165                   06/669,881                   03/10/87
4,648,167                   06/724,826                   03/10/87
4,648,169                   06/825,634                   03/10/87
4,648,176                   06/738,871                   03/10/87
4,648,183                   06/788,399                   03/10/87
4,648,187                   06/756,250                   03/10/87
4,648,188                   06/768,813                   03/10/87
4,648,191                   06/801,223                   03/10/87
4,648,194                   06/290,889                   03/10/87
4,648,201                   06/840,066                   03/10/87
4,648,210                   06/749,959                   03/10/87
4,648,211                   06/772,269                   03/10/87
4,648,212                   06/772,267                   03/10/87
4,648,220                   06/740,061                   03/10/87
4,648,221                   06/574,239                   03/10/87
4,648,225                   06/742,725                   03/10/87
4,648,226                   06/555,953                   03/10/87
4,648,227                   06/779,246                   03/10/87
4,648,228                   06/774,663                   03/10/87
4,648,231                   06/767,608                   03/10/87
4,648,234                   06/225,260                   03/10/87
4,648,238                   06/712,848                   03/10/87
4,648,239                   06/858,467                   03/10/87
4,648,245                   06/729,061                   03/10/87
4,648,246                   06/689,327                   03/10/87
4,648,248                   06/756,683                   03/10/87
4,648,252                   06/730,191                   03/10/87
4,648,256                   06/727,143                   03/10/87
4,648,261                   06/797,107                   03/10/87
4,648,265                   06/743,541                   03/10/87
4,648,269                   06/751,553                   03/10/87
4,648,272                   06/799,600                   03/10/87
4,648,275                   06/728,899                   03/10/87
4,648,278                   06/730,854                   03/10/87
4,648,279                   06/748,153                   03/10/87
4,648,280                   06/823,998                   03/10/87
4,648,281                   06/748,497                   03/10/87
4,648,284                   06/617,228                   03/10/87
4,648,289                   06/769,324                   03/10/87
4,648,294                   06/763,756                   03/10/87
4,648,297                   06/746,056                   03/10/87
4,648,298                   06/735,843                   03/10/87
4,648,301                   06/735,615                   03/10/87
4,648,303                   06/748,202                   03/10/87
4,648,308                   06/708,397                   03/10/87
4,648,314                   06/616,430                   03/10/87
4,648,315                   06/799,488                   03/10/87
4,648,317                   06/731,856                   03/10/87
4,648,318                   06/780,394                   03/10/87
4,648,319                   06/733,831                   03/10/87
4,648,320                   06/715,901                   03/10/87
4,648,321                   06/720,204                   03/10/87
4,648,333                   06/752,835                   03/10/87
4,648,337                   06/865,554                   03/10/87
4,648,339                   06/739,259                   03/10/87
4,648,344                   06/752,486                   03/10/87
4,648,345                   06/774,565                   03/10/87
4,648,346                   06/845,617                   03/10/87
4,648,347                   06/738,739                   03/10/87
4,648,349                   06/757,617                   03/10/87
4,648,351                   06/740,877                   03/10/87
4,648,352                   06/822,281                   03/10/87
4,648,353                   06/739,643                   03/10/87
4,648,355                   06/798,923                   03/10/87
4,648,356                   06/742,318                   03/10/87
4,648,363                   06/797,157                   03/10/87
4,648,364                   06/752,801                   03/10/87
4,648,369                   06/720,771                   03/10/87
4,648,376                   06/749,808                   03/10/87
4,648,378                   06/816,877                   03/10/87
4,648,379                   06/807,447                   03/10/87
4,648,387                   06/740,582                   03/10/87
4,648,390                   06/735,376                   03/10/87
4,648,393                   06/667,544                   03/10/87
4,648,397                   06/791,959                   03/10/87
4,648,400                   06/731,121                   03/10/87
4,648,401                   06/665,723                   03/10/87
4,648,403                   06/734,500                   03/10/87
4,648,407                   06/874,808                   03/10/87
4,648,409                   06/813,680                   03/10/87
4,648,412                   06/724,198                   03/10/87
4,648,413                   06/587,325                   03/10/87
4,648,415                   06/640,162                   03/10/87
4,648,418                   06/836,543                   03/10/87
4,648,419                   06/794,996                   03/10/87
4,648,420                   06/733,716                   03/10/87
4,648,422                   06/726,582                   03/10/87
4,648,423                   06/757,565                   03/10/87
4,648,431                   06/776,381                   03/10/87
4,648,432                   06/754,856                   03/10/87
4,648,434                   06/653,936                   03/10/87
4,648,436                   06/580,681                   03/10/87
4,648,440                   06/410,885                   03/10/87
4,648,441                   06/728,437                   03/10/87
4,648,443                   06/815,755                   03/10/87
4,648,444                   06/724,365                   03/10/87
4,648,450                   06/802,800                   03/10/87
4,648,451                   06/696,906                   03/10/87
4,648,452                   06/729,451                   03/10/87
4,648,453                   06/799,072                   03/10/87
4,648,455                   06/852,571                   03/10/87
4,648,457                   06/790,876                   03/10/87
4,648,460                   06/634,622                   03/10/87
4,648,461                   06/749,976                   03/10/87
4,648,467                   06/661,563                   03/10/87
4,848,470                   06/868,966                   03/10/87
4,648,472                   06/715,208                   03/10/87
4,648,474                   06/536,245                   03/10/87
4,648,476                   06/694,120                   03/10/87
4,648,483                   06/794,002                   03/10/87
4,648,486                   06/659,365                   03/10/87
4,648,500                   06/709,515                   03/10/87
4,648,502                   06/743,538                   03/10/87
4,648,504                   06/628,990                   03/10/87
4,648,505                   06/810,757                   03/10/87
4,648,508                   06/746,308                   03/10/87
4,648,510                   06/818,570                   03/10/87
4,648,512                   06/723,444                   03/10/87
4,648,515                   06/504,957                   03/10/87
4,648,516                   06/691,403                   03/10/87
4,648,517                   06/779,669                   03/10/87
4,648,518                   06/735,165                   03/10/87
4,648,523                   06/673,420                   03/10/87
4,648,528                   06/792,106                   03/10/87
4,648,531                   06/708,464                   03/10/87
4,648,533                   06/725,369                   03/10/87
4,648,536                   06/739,735                   03/10/87
4,648,537                   06/778,956                   03/10/87
4,648,538                   06/845,624                   03/10/87
4,648,543                   06/620,128                   03/10/87
4,648,547                   06/749,045                   03/10/87
4,648,550                   06/770,407                   03/10/87
4,648,555                   06/798,877                   03/10/87
4,648,556                   06/630,908                   03/10/87
4,648,557                   06/737,350                   03/10/87
4,648,561                   06/761,996                   03/10/87
4,648,569                   06/790,556                   03/10/87
4,648,574                   06/802,708                   03/10/87
4,648,576                   06/803,296                   03/10/87
4,648,585                   06/742,599                   03/10/87
4,648,588                   06/743,827                   03/10/87
4,648,595                   06/744,541                   03/10/87
4,648,606                   06/752,748                   03/10/87
4,648,616                   06/784,420                   03/10/87
4,648,617                   06/741,768                   03/10/87
4,648,618                   06/743,358                   03/10/87
4,648,619                   06/783,440                   03/10/87
4,648,621                   06/729,555                   03/10/87
4,648,623                   06/834,396                   03/10/87
4,648,624                   06/795,598                   03/10/87
4,648,629                   06/729,460                   03/10/87
4,648,632                   06/506,698                   03/10/87
4,648,635                   06/835,452                   03/10/87
4,648,639                   06/752,369                   03/10/87
4,648,640                   06/754,540                   03/10/87
4,648,645                   06/729,796                   03/10/87
4,648,651                   06/744,553                   03/10/87
4,648,652                   06/877,180                   03/10/87
4,648,654                   06/581,846                   03/10/87
4,648,661                   06/745,784                   03/10/87
4,648,664                   06/707,438                   03/10/87
4,648,666                   06/751,760                   03/10/87
4,648,667                   06/756,507                   03/10/87
4,648,671                   06/868,980                   03/10/87
4,648,675                   06/881,578                   03/10/87
4,648,677                   06/740,096                   03/10/87
4,648,686                   06/437,451                   03/10/87
4,648,690                   06/729,361                   03/10/87
4,648,691                   06/218,582                   03/10/87
4,648,692                   06/879,491                   03/10/87
4,648,693                   06/698,374                   03/10/87
4,648,695                   06/636,838                   03/10/87
4,648,718                   06/757,736                   03/10/87
4,648,721                   06/747,857                   03/10/87
4,648,732                   06/758,549                   03/10/87
4,648,733                   06/754,519                   03/10/87
4,648,734                   06/641,710                   03/10/87
4,648,737                   06/748,194                   03/10/87
4,648,740                   06/835,370                   03/10/87
4,648,743                   06/790,470                   03/10/87
4,648,744                   06/730,281                   03/10/87
4,648,747                   06/748,786                   03/10/87
4,648,750                   06/715,931                   03/10/87
4,648,751                   06/797,371                   03/10/87
4,648,759                   06/770,387                   03/10/87
4,648,762                   06/625,352                   03/10/87
4,648,763                   06/897,794                   03/10/87
4,648,764                   06/385,697                   03/10/87
4,648,774                   06/778,078                   03/10/87
4,648,777                   06/704,661                   03/10/87
4,648,778                   06/717,671                   03/10/87
4,648,780                   06/769,035                   03/10/87
4,648,781                   06/738,873                   03/10/87
4,648,783                   06/668,747                   03/10/87
4,648,784                   06/735,343                   03/10/87
4,648,786                   06/448,173                   03/10/87
4,648,787                   06/777,981                   03/10/87
4,648,790                   06/623,199                   03/10/87
4,648,793                   06/739,728                   03/10/87
4,648,795                   06/805,799                   03/10/87
4,648,796                   06/625,917                   03/10/87
4,648,802                   06/648,010                   03/10/87
4,648,803                   06/779,368                   03/10/87
4,648,807                   06/734,003                   03/10/87
4,648,811                   06/776,796                   03/10/87
4,648,818                   06/777,877                   03/10/87
4,648,820                   06/797,925                   03/10/87
4,648,821                   06/646,683                   03/10/87
4,648,823                   06/709,064                   03/10/87
4,648,835                   06/753,800                   03/10/87
4,648,836                   06/801,834                   03/10/87
4,648,841                   06/824,673                   03/10/87
4,648,847                   06/711,161                   03/10/87
4,648,852                   06/746,286                   03/10/87
4,648,855                   06/830,647                   03/10/87
4,648,857                   06/873,307                   03/10/87
4,648,859                   06/451,953                   03/10/87
4,648,863                   06/698,573                   03/10/87
4,648,867                   06/842,377                   03/10/87
4,648,871                   06/711,505                   03/10/87
4,648,873                   06/731,013                   03/10/87
4,648,874                   06/704,280                   03/10/87
4,648,882                   06/807,390                   03/10/87
4,648,883                   06/755,381                   03/10/87
4,648,888                   06/793,205                   03/10/87
4,648,894                   06/649,779                   03/10/87
4,648,900                   06/639,621                   03/10/87
4,648,905                   06/706,102                   03/10/87
4,648,914                   06/662,855                   03/10/87
4,648,917                   06/769,909                   03/10/87
4,648,923                   06/697,474                   03/10/87
4,648,931                   06/733,702                   03/10/87
4,648,933                   06/782,137                   03/10/87
4,648,934                   06/607,427                   03/10/87
4,648,936                   06/786,563                   03/10/87
4,648,938                   06/786,560                   03/10/87
4,648,939                   06/845,585                   03/10/87
4,648,940                   06/806,802                   03/10/87
4,648,941                   06/826,120                   03/10/87
4,648,942                   06/719,280                   03/10/87
4,648,945                   06/714,650                   03/10/87
4,648,947                   06/729,216                   03/10/87
4,648,948                   06/858,342                   03/10/87
4,648,950                   06/786,993                   03/10/87
4,648,952                   06/802,211                   03/10/87
4,648,953                   06/588,102                   03/10/87
4,648,954                   06/792,955                   03/10/87
4,648,962                   06/830,906                   03/10/87
4,648,964                   06/771,204                   03/10/87
4,648,966                   06/803,690                   03/10/87
4,648,967                   06/778,323                   03/10/87
4,648,976                   06/709,738                   03/10/87
4,648,977                   06/814,897                   03/10/87
4,648,978                   06/726,422                   03/10/87
4,648,985                   06/882,040                   03/10/87
4,648,991                   06/615,203                   03/10/87
4,648,992                   06/700,203                   03/10/87
4,648,993                   06/752,598                   03/10/87
4,648,994                   06/822,178                   03/10/87
4,648,998                   06/710,221                   03/10/87
4,648,999                   06/758,210                   03/10/87
4,649,002                   06/718,374                   03/10/87
4,649,004                   06/686,507                   03/10/87
4,649,005                   06/754,492                   03/10/87
4,649,006                   06/673,755                   03/10/87
4,649,013                   06/469,249                   03/10/87
4,649,015                   06/632,743                   03/10/87
4,649,016                   06/785,814                   03/10/87
4,649,017                   06/686,171                   03/10/87
4,649,018                   06/587,916                   03/10/87
4,649,019                   06/873,145                   03/10/87
4,649,032                   06/690,545                   03/10/87
4,649,042                   06/719,195                   03/10/87
4,649,044                   06/509,668                   03/10/87
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