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. 33,694                  07/221,568                   09/17/91
(4,658,377)                (06/634,898)                (04/14/87)
Re. 34,329                  07/849,292                   08/03/93
(5,008,144)                (07/442,890)                (04/16/91)
4,380,099                   06/287,847                   04/19/83
4,380,112                   06/301,480                   04/19/83
4,380,114                   06/236,258                   04/19/83
4,380,115                   06/293,200                   04/19/83
4,380,117                   06/267,104                   04/19/83
4,380,118                   06/292,564                   04/19/83
4,380,119                   06/255,200                   04/19/83
4,380,124                   06/217,183                   04/19/83
4,380,144                   06/289,165                   04/19/83
4,380,149                   06/232,320                   04/19/83
4,380,155                   06/238,521                   04/19/83
4,380,156                   06/330,005                   04/19/83
4,380,163                   06/300,323                   04/19/83
4,380,166                   06/355,188                   04/19/83
4,380,167                   06/245,108                   04/19/83
4,380,183                   06/265,572                   04/19/83
4,380,185                   06/321,627                   04/19/83
4,380,188                   06/229,300                   04/19/83
4,380,192                   06/292,740                   04/19/83
4,380,208                   06/281,233                   04/19/83
4,380,211                   06/299,188                   04/19/83
4,380,217                   06/264,976                   04/19/83
4,380,221                   06/231,654                   04/19/83
4,380,225                   06/235,566                   04/19/83
4,380,232                   06/263,496                   04/19/83
4,380,235                   06/259,436                   04/19/83
4,380,237                   06/293,198                   04/19/83
4,380,240                   06/289,413                   04/19/83
4,380,250                   06/247,022                   04/19/83
4,380,251                   06/328,934                   04/19/83
4,380,254                   06/299,848                   04/19/83
4,380,256                   06/221,392                   04/19/83
4,380,257                   06/230,386                   04/19/83
4,380,274                   06/256,677                   04/19/83
4,380,295                   06/251,190                   04/19/83
4,380,296                   06/225,732                   04/19/83
4,380,306                   06/234,097                   04/19/83
4,380,310                   06/337,392                   04/19/83
4,380,316                   06/283,228                   04/19/83
4,380,317                   06/344,145                   04/19/83
4,380,321                   06/228,365                   04/19/83
4,380,325                   06/221,461                   04/19/83
4,380,332                   06/243,357                   04/19/83
4,380,337                   06/323,222                   04/19/83
4,380,340                   06/301,027                   04/19/83
4,380,345                   06/255,076                   04/19/83
4,380,346                   06/257,285                   04/19/83
4,380,362                   06/256,634                   04/19/83
4,380,370                   06/261,052                   04/19/83
4,380,385                   06/228,806                   04/19/83
4,380,386                   06/283,811                   04/19/83
4,380,387                   06/312,709                   04/19/83
4,380,396                   06/220,432                   04/19/83
4,380,397                   06/225,774                   04/19/83
4,380,402                   06/288,900                   04/19/83
4,380,408                   06/281,751                   04/19/83
4,380,411                   06/245,250                   04/19/83
4,380,418                   06/238,141                   04/19/83
4,380,420                   06/309,395                   04/19/83
4,380,433                   06/267,007                   04/19/83
4,380,443                   06/271,844                   04/19/83
4,380,444                   06/257,526                   04/19/83
4,380,460                   06/332,912                   04/19/83
4,380,464                   06/345,738                   04/19/83
4,380,467                   06/243,008                   04/19/83
4,380,468                   06/307,922                   04/19/83
4,380,487                   06/227,551                   04/19/83
4,380,488                   06/317,582                   04/19/83
4,380,494                   06/254,545                   04/19/83
4,380,497                   06/263,376                   04/19/83
4,380,502                   06/239,247                   04/19/83
4,380,506                   06/247,249                   04/19/83
4,380,511                   06/292,236                   04/19/83
4,380,512                   06/271,744                   04/19/83
4,380,519                   06/371,472                   04/19/83
4,380,523                   06/283,976                   04/19/83
4,380,526                   06/230,474                   04/19/83
4,380,531                   06/313,416                   04/19/83
4,380,533                   06/281,534                   04/19/83
4,380,543                   06/318,928                   04/19/83
4,380,544                   06/361,682                   04/19/83
4,380,549                   06/246,364                   04/19/83
4,380,550                   06/383,080                   04/19/83
4,380,563                   06/353,430                   04/19/83
4,380,585                   06/285,930                   04/19/83
4,380,586                   06/310,451                   04/19/83
4,380,587                   06/294,584                   04/19/83
4,380,589                   06/334,117                   04/19/83
4,380,591                   06/345,393                   04/19/83
4,380,592                   06/413,975                   04/19/83
4,380,616                   06/263,647                   04/19/83
4,380,619                   06/366,744                   04/19/83
4,380,623                   06/250,797                   04/19/83
4,380,632                   06/286,432                   04/19/83
4,380,636                   06/387,587                   04/19/83
4,380,644                   06/291,105                   04/19/83
4,380,646                   06/229,433                   04/19/83
4,380,647                   06/240,043                   04/19/83
4,380,648                   06/247,361                   04/19/83
4,380,649                   06/324,193                   04/19/83
4,380,650                   06/222,199                   04/19/83
4,380,654                   06/349,804                   04/19/83
4,380,656                   06/287,395                   04/19/83
4,380,665                   06/299,892                   04/19/83
4,380,671                   06/288,428                   04/19/83
4,380,677                   06/262,366                   04/19/83
4,380,682                   06/351,219                   04/19/83
4,380,684                   06/369,458                   04/19/83
4,380,687                   06/248,129                   04/19/83
4,380,688                   06/283,114                   04/19/83
4,380,690                   06/278,459                   04/19/83
4,380,697                   06/278,785                   04/19/83
4,380,699                   06/278,144                   04/19/83
4,380,708                   06/286,233                   04/19/83
4,380,712                   06/254,612                   04/19/83
4,380,714                   06/216,106                   04/19/83
4,380,716                   06/309,947                   04/19/83
4,380,729                   06/275,256                   04/19/83
4,380,747                   06/237,997                   04/19/83
4,380,748                   06/216,751                   04/19/83
4,380,760                   06/247,878                   04/19/83
4,380,762                   06/236,367                   04/19/83
4,380,763                   06/222,845                   04/19/83
4,380,774                   06/217,977                   04/19/83
4,380,777                   06/216,703                   04/19/83
4,380,780                   06/243,438                   04/19/83
4,380,781                   06/244,058                   04/19/83
4,380,794                   06/274,055                   04/19/83
4,380,801                   06/320,728                   04/19/83
4,380,813                   06/249,808                   04/19/83
4,380,816                   06/270,301                   04/19/83
4,380,824                   06/233,869                   04/19/83
4,380,827                   06/304,391                   04/19/83
4,380,828                   06/267,136                   04/19/83
4,380,829                   06/264,499                   04/19/83
4,380,831                   06/286,405                   04/19/83
4,656,667                   06/715,621                   04/14/87
4,656,669                   06/880,588                   04/14/87
4,656,670                   06/764,184                   04/14/87
4,656,673                   06/828,378                   04/14/87
4,656,676                   06/846,071                   04/14/87
4,656,680                   06/733,092                   04/14/87
4,656,683                   06/769,743                   04/14/87
4,656,685                   06/746,511                   04/14/87
4,656,686                   06/795,764                   04/14/87
4,656,688                   06/780,514                   04/14/87
4,656,690                   06/787,528                   04/14/87
4,656,693                   06/848,571                   04/14/87
4,656,708                   06/792,462                   04/14/87
4,656,709                   06/804,287                   04/14/87
4,656,715                   06/884,438                   04/14/87
4,656,717                   06/780,995                   04/14/87
4,656,734                   06/741,916                   04/14/87
4,656,736                   06/817,078                   04/14/87
4,656,738                   06/761,155                   04/14/87
4,656,741                   06/786,300                   04/14/87
4,656,744                   06/696,251                   04/14/87
4,656,748                   06/831,482                   04/14/87
4,656,754                   06/798,037                   04/14/87
4,656,756                   06/817,171                   04/14/87
4,656,758                   06/765,112                   04/14/87
4,656,765                   06/546,102                   04/14/87
4,656,767                   06/830,264                   04/14/87
4,656,772                   06/917,700                   04/14/87
4,656,774                   06/808,259                   04/14/87
4,656,779                   06/498,098                   04/14/87
4,656,784                   06/799,633                   04/14/87
4,656,785                   06/851,122                   04/14/87
4,656,791                   06/654,975                   04/14/87
4,656,795                   06/676,450                   04/14/87
4,656,796                   06/787,387                   04/14/87
4,656,797                   06/818,015                   04/14/87
4,656,799                   06/856,461                   04/14/87
4,656,800                   06/901,284                   04/14/87
4,656,801                   06/792,065                   04/14/87
4,656,805                   06/808,028                   04/14/87
4,656,806                   06/809,501                   04/14/87
4,656,807                   06/811,337                   04/14/87
4,656,809                   06/793,689                   04/14/87
4,656,811                   06/714,126                   04/14/87
4,656,812                   06/766,812                   04/14/87
4,656,826                   06/761,684                   04/14/87
4,656,827                   06/788,588                   04/14/87
4,656,831                   06/733,886                   04/14/87
4,656,833                   06/597,517                   04/14/87
4,656,834                   06/813,114                   04/14/87
4,656,836                   06/732,760                   04/14/87
4,656,838                   06/906,191                   04/14/87
4,656,843                   06/672,794                   04/14/87
4,656,850                   06/683,320                   04/14/87
4,656,851                   06/856,065                   04/14/87
4,656,852                   06/752,531                   04/14/87
4,656,853                   06/871,084                   04/14/87
4,656,855                   06/785,403                   04/14/87
4,656,858                   06/623,225                   04/14/87
4,656,865                   06/774,107                   04/14/87
4,656,867                   06/788,649                   04/14/87
4,656,869                   06/747,924                   04/14/87
4,656,873                   06/767,176                   04/14/87
4,656,875                   06/752,188                   04/14/87
4,656,876                   06/874,857                   04/14/87
4,656,880                   06/777,596                   04/14/87
4,656,889                   06/835,377                   04/14/87
4,656,890                   06/810,626                   04/14/87
4,656,892                   06/676,704                   04/14/87
4,656,895                   06/700,496                   04/14/87
4,656,896                   06/853,725                   04/14/87
4,656,897                   06/857,002                   04/14/87
4,656,902                   06/794,673                   04/14/87
4,656,916                   06/697,219                   04/14/87
4,656,918                   06/703,583                   04/14/87
4,656,919                   06/689,736                   04/14/87
4,656,920                   06/820,956                   04/14/87
4,656,921                   06/733,365                   04/14/87
4,656,922                   06/797,213                   04/14/87
4,656,924                   06/809,650                   04/14/87
4,656,927                   06/806,520                   04/14/87
4,656,935                   06/747,360                   04/14/87
4,656,939                   06/317,238                   04/14/87
4,656,941                   06/659,980                   04/14/87
4,656,944                   06/805,688                   04/14/87
4,656,945                   06/714,205                   04/14/87
4,656,946                   06/619,343                   04/14/87
4,656,947                   06/810,774                   04/14/87
4,656,951                   06/737,267                   04/14/87
4,656,953                   06/812,464                   04/14/87
4,656,955                   06/858,598                   04/14/87
4,656,957                   06/790,398                   04/14/87
4,656,958                   06/898,163                   04/14/87
4,656,960                   06/816,639                   04/14/87
4,656,963                   06/745,876                   04/14/87
4,656,966                   06/893,426                   04/14/87
4,656,967                   06/766,952                   04/14/87
4,656,969                   06/808,950                   04/14/87
4,656,971                   06/862,874                   04/14/87
4,656,972                   06/773,116                   04/14/87
4,656,974                   06/758,221                   04/14/87
4,656,978                   06/847,229                   04/14/87
4,656,979                   06/773,987                   04/14/87
4,656,980                   06/753,721                   04/14/87
4,656,982                   06/735,578                   04/14/87
4,656,988                   06/846,946                   04/14/87
4,656,991                   06/804,676                   04/14/87
4,656,995                   06/737,535                   04/14/87
4,656,996                   06/736,780                   04/14/87
4,657,001                   06/634,205                   04/14/87
4,657,002                   06/731,024                   04/14/87
4,657,007                   06/392,490                   04/14/87
4,657,012                   06/718,505                   04/14/87
4,657,015                   06/701,576                   04/14/87
4,657,016                   06/723,690                   04/14/87
4,657,017                   06/769,622                   04/14/87
4,657,018                   06/660,594                   04/14/87
4,657,022                   06/794,625                   04/14/87
4,657,026                   06/885,176                   04/14/87
4,657,027                   06/694,337                   04/14/87
4,657,032                   06/791,533                   04/14/87
4,657,033                   06/869,373                   04/14/87
4,657,034                   06/920,217                   04/14/87
4,657,039                   06/646,641                   04/14/87
4,657,040                   06/801,540                   04/14/87
4,657,043                   06/802,433                   04/14/87
4,657,044                   06/751,691                   04/14/87
4,657,045                   06/695,244                   04/14/87
4,657,047                   06/680,351                   04/14/87
4,657,050                   06/634,342                   04/14/87
4,657,054                   06/893,035                   04/14/87
4,657,056                   06/799,653                   04/14/87
4,657,062                   06/709,703                   04/14/87
4,657,065                   06/884,123                   04/14/87
4,657,067                   06/746,586                   04/14/87
4,657,073                   06/731,694                   04/14/87
4,657,074                   06/830,883                   04/14/87
4,657,076                   06/706,129                   04/14/87
4,657,089                   06/743,580                   04/14/87
4,657,090                   06/823,344                   04/14/87
4,657,095                   06/785,380                   04/14/87
4,657,101                   06/744,592                   04/14/87
4,657,109                   06/653,589                   04/14/87
4,657,119                   06/874,881                   04/14/87
4,657,123                   06/693,712                   04/14/87
4,657,135                   06/771,478                   04/14/87
4,657,137                   06/266,564                   04/14/87
4,657,138                   06/850,611                   04/14/87
4,657,145                   06/742,006                   04/14/87
4,657,146                   06/795,601                   04/14/87
4,657,147                   06/751,253                   04/14/87
4,657,154                   06/866,070                   04/14/87
4,657,163                   06/764,129                   04/14/87
4,657,164                   06/640,035                   04/14/87
4,657,165                   06/782,119                   04/14/87
4,657,167                   06/691,926                   04/14/87
4,657,169                   06/619,438                   04/14/87
4,657,170                   06/787,552                   04/14/87
4,657,173                   06/790,947                   04/14/87
4,657,178                   06/314,872                   04/14/87
4,657,180                   06/595,537                   04/14/87
4,657,183                   06/800,133                   04/14/87
4,657,184                   06/824,761                   04/14/87
4,657,192                   06/616,119                   04/14/87
4,657,194                   06/844,815                   04/14/87
4,657,201                   06/794,255                   04/14/87
4,657,202                   06/843,301                   04/14/87
4,657,210                   06/735,069                   04/14/87
4,657,211                   06/673,484                   04/14/87
4,657,214                   06/799,418                   04/14/87
4,657,219                   06/378,738                   04/14/87
4,657,222                   06/802,236                   04/14/87
4,657,225                   06/887,873                   04/14/87
4,657,226                   06/776,441                   04/14/87
4,657,227                   06/799,541                   04/14/87
4,657,229                   06/684,486                   04/14/87
4,657,231                   06/848,407                   04/14/87
4,657,234                   06/832,822                   04/14/87
4,657,243                   06/764,409                   04/14/87
4,657,250                   06/715,249                   04/14/87
4,657,251                   06/701,865                   04/14/87
4,657,257                   06/715,646                   04/14/87
4,657,258                   06/792,549                   04/14/87
4,657,262                   06/714,458                   04/14/87
4,657,265                   06/808,927                   04/14/87
4,657,267                   06/777,168                   04/14/87
4,657,268                   06/754,593                   04/14/87
4,657,270                   06/603,877                   04/14/87
4,657,272                   06/774,993                   04/14/87
4,657,274                   06/776,524                   04/14/87
4,657,275                   06/849,215                   04/14/87
4,657,277                   06/666,221                   04/14/87
4,657,279                   06/816,377                   04/14/87
4,657,282                   06/795,401                   04/14/87
4,657,287                   06/785,133                   04/14/87
4,657,292                   06/780,865                   04/14/87
4,657,295                   06/803,737                   04/14/87
4,657,301                   06/788,583                   04/14/87
4,657,304                   06/871,449                   04/14/87
4,657,305                   06/904,413                   04/14/87
4,657,306                   06/790,234                   04/14/87
4,657,307                   06/809,044                   04/14/87
4,657,309                   06/855,014                   04/14/87
4,657,312                   06/734,856                   04/14/87
4,657,315                   06/744,799                   04/14/87
4,657,316                   06/898,722                   04/14/87
4,657,319                   06/724,562                   04/14/87
4,657,325                   06/835,834                   04/14/87
4,657,332                   06/752,135                   04/14/87
4,657,333                   06/230,444                   04/14/87
4,657,334                   06/789,466                   04/14/87
4,657,341                   06/634,468                   04/14/87
4,657,347                   06/896,117                   04/14/87
4,657,348                   06/683,267                   04/14/87
4,657,349                   06/640,718                   04/14/87
4,657,350                   06/830,242                   04/14/87
4,657,362                   06/705,099                   04/14/87
4,657,373                   06/755,949                   04/14/87
4,657,378                   06/739,187                   04/14/87
4,657,379                   06/729,970                   04/14/87
4,657,380                   06/839,780                   04/14/87
4,657,381                   06/251,054                   04/14/87
4,657,383                   06/666,357                   04/14/87
4,657,384                   06/478,917                   04/14/87
4,657,388                   06/740,968                   04/14/87
4,657,389                   06/749,051                   04/14/87
4,657,398                   06/742,775                   04/14/87
4,657,407                   06/651,573                   04/14/87
4,657,413                   06/745,251                   04/14/87
4,657,424                   06/813,369                   04/14/87
4,657,425                   06/832,966                   04/14/87
4,657,426                   06/846,893                   04/14/87
4,657,428                   06/774,331                   04/14/87
4,657,429                   06/823,815                   04/14/87
4,657,430                   06/618,328                   04/14/87
4,657,431                   06/841,239                   04/14/87
4,657,435                   06/814,047                   04/14/87
4,657,440                   06/685,495                   04/14/87
4,657,441                   06/660,917                   04/14/87
4,657,442                   06/749,572                   04/14/87
4,657,444                   06/758,343                   04/14/87
4,657,445                   06/588,230                   04/14/87
4,657,448                   06/728,695                   04/14/87
4,657,450                   06/840,936                   04/14/87
4,657,452                   06/698,609                   04/14/87
4,657,458                   06/883,458                   04/14/87
4,657,461                   06/665,460                   04/14/87
4,657,463                   06/827,186                   04/14/87
4,657,464                   06/720,188                   04/14/87
4,657,465                   06/703,491                   04/14/87
4,657,466                   06/723,085                   04/14/87
4,657,468                   06/802,090                   04/14/87
4,657,469                   06/820,951                   04/14/87
4,657,470                   06/861,623                   04/14/87
4,657,474                   06/572,290                   04/14/87
4,657,477                   06/784,700                   04/14/87
4,657,478                   06/803,432                   04/14/87
4,657,480                   06/629,601                   04/14/87
4,657,491                   06/776,955                   04/14/87
4,657,493                   06/697,591                   04/14/87
4,657,494                   06/758,452                   04/14/87
4,657,495                   06/792,249                   04/14/87
4,657,498                   06/843,426                   04/14/87
4,657,502                   06/601,671                   04/14/87
4,657,503                   06/763,818                   04/14/87
4,657,507                   06/833,023                   04/14/87
4,657,509                   06/765,818                   04/14/87
4,657,511                   06/680,396                   04/14/87
4,657,512                   06/740,614                   04/14/87
4,657,513                   06/710,609                   04/14/87
4,657,522                   06/645,937                   04/14/87
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