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 24, 1996
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,194                  06/691,267                   06/24/86
(4,445,143)                (06/260,589)                (04/24/84)
Re. 32,367                  06/755,370                   03/10/87
(4,443,938)                (06/359,341)                (04/24/84)
Re. 32,548                  07/013,951                   11/24/87
(4,444,174)                (06/339,868)                (04/24/84)
Re. 32,654                  06/855,515                   04/26/88
(4,445,061)                (06/401,134)                (04/24/84)
Re. 33,466                  07/509,939                   12/04/90
(4,738,015)                (07/008,245)                (04/19/88)
Re. 33,776                  07/510,975                   12/24/91
(4,738,206)                (06/907,961)                (04/19/88)
4,443,891                   06/341,995                   04/24/84
4,443,892                   06/363,620                   04/24/84
4,443,902                   06/280,211                   04/24/84
4,443,906                   06/409,845                   04/24/84
4,443,910                   06/393,275                   04/24/84
4,443,911                   06/444,175                   04/24/84
4,443,912                   06/320,611                   04/24/84
4,443,913                   06/285,466                   04/24/84
4,443,914                   06/360,384                   04/24/84
4,443,916                   06/325,856                   04/24/84
4,443,918                   06/283,990                   04/24/84
4,443,920                   06/300,216                   04/24/84
4,443,923                   06/391,163                   04/24/84
4,443,926                   06/346,476                   04/24/84
4,443,927                   06/323,966                   04/24/84
4,443,933                   06/367,506                   04/24/84
4,443,935                   06/353,479                   04/24/84
4,443,941                   06/312,182                   04/24/84
4,443,947                   06/268,632                   04/24/84
4,443,959                   06/357,764                   04/24/84
4,443,973                   06/283,541                   04/24/84
4,443,984                   06/277,226                   04/24/84
4,443,985                   06/297,983                   04/24/84
4,443,986                   06/358,277                   04/24/84
4,443,993                   06/321,012                   04/24/84
4,444,013                   06/301,638                   04/24/84
4,444,014                   06/340,342                   04/24/84
4,444,017                   06/362,785                   04/24/84
4,444,019                   06/293,126                   04/24/84
4,444,026                   06/352,324                   04/24/84
4,444,027                   06/313,352                   04/24/84
4,444,028                   06/321,617                   04/24/84
4,444,032                   06/380,501                   04/24/84
4,444,033                   06/260,835                   04/24/84
4,444,035                   06/398,813                   04/24/84
4,444,038                   06/314,580                   04/24/84
4,444,040                   06/400,020                   04/24/84
4,444,044                   06/399,943                   04/24/84
4,444,050                   06/322,487                   04/24/84
4,444,056                   06/374,972                   04/24/84
4,444,063                   06/296,043                   04/24/84
4,444,066                   06/278,771                   04/24/84
4,444,067                   06/253,585                   04/24/84
4,444,070                   06/297,932                   04/24/84
4,444,078                   06/345,707                   04/24/84
4,444,079                   06/388,052                   04/24/84
4,444,080                   06/331,929                   04/24/84
4,444,083                   06/344,640                   04/24/84
4,444,087                   06/343,540                   04/24/84
4,444,089                   06/352,869                   04/24/84
4,444,093                   06/313,983                   04/24/84
4,444,094                   06/422,893                   04/24/84
4,444,097                   06/376,580                   04/24/84
4,444,098                   06/382,885                   04/24/84
4,444,109                   06/443,343                   04/24/84
4,444,113                   06/251,633                   04/24/84
4,444,118                   06/237,907                   04/24/84
4,444,122                   06/296,796                   04/24/84
4,444,128                   06/385,051                   04/24/84
4,444,129                   06/439,629                   04/24/84
4,444,133                   06/490,353                   04/24/84
4,444,137                   06/481,546                   04/24/84
4,444,141                   06/377,232                   04/24/84
4,444,143                   06/284,455                   04/24/84
4,444,152                   06/379,660                   04/24/84
4,444,154                   06/365,551                   04/24/84
4,444,157                   06/448,838                   04/24/84
4,444,158                   06/414,744                   04/24/84
4,444,162                   06/367,555                   04/24/84
4,444,164                   06/368,391                   04/24/84
4,444,165                   06/368,393                   04/24/84
4,444,166                   06/472,317                   04/24/84
4,444,171                   06/440,547                   04/24/84
4,444,172                   06/389,586                   04/24/84
4,444,191                   06/285,771                   04/24/84
4,444,200                   06/299,578                   04/24/84
4,444,208                   06/394,989                   04/24/84
4,444,209                   06/357,183                   04/24/84
4,444,222                   06/377,610                   04/24/84
4,444,229                   06/264,917                   04/24/84
4,444,231                   06/334,475                   04/24/84
4,444,244                   06/374,780                   04/24/84
4,444,257                   06/215,995                   04/24/84
4,444,263                   06/487,790                   04/24/84
4,444,280                   06/332,616                   04/24/84
4,444,284                   06/290,342                   04/24/84
4,444,285                   06/288,538                   04/24/84
4,444,290                   06/315,955                   04/24/84
4,444,294                   06/306,759                   04/24/84
4,444,296                   06/343,658                   04/24/84
4,444,297                   06/319,325                   04/24/84
4,444,298                   06/282,296                   04/24/84
4,444,301                   06/222,020                   04/24/84
4,444,304                   06/276,718                   04/24/84
4,444,319                   06/271,704                   04/24/84
4,444,322                   06/309,770                   04/24/84
4,444,332                   06/292,939                   04/24/84
4,444,340                   06/382,485                   04/24/84
4,444,344                   06/422,075                   04/24/84
4,444,373                   06/363,150                   04/24/84
4,444,376                   06/529,668                   04/24/84
4,444,377                   06/398,406                   04/24/84
4,444,380                   06/292,555                   04/24/84
4,444,388                   06/303,298                   04/24/84
4,444,395                   06/435,756                   04/24/84
4,444,402                   06/400,909                   04/24/84
4,444,406                   06/333,463                   04/24/84
4,444,411                   06/373,310                   04/24/84
4,444,413                   06/298,154                   04/24/84
4,444,414                   06/372,403                   04/24/84
4,444,422                   06/366,065                   04/24/84
4,444,427                   06/376,516                   04/24/84
4,444,428                   06/273,922                   04/24/84
4,444,431                   06/396,331                   04/24/84
4,444,442                   06/361,985                   04/24/84
4,444,446                   06/303,955                   04/24/84
4,444,459                   06/278,015                   04/24/84
4,444,462                   06/297,177                   04/24/84
4,444,467                   06/291,851                   04/24/84
4,444,468                   06/292,123                   04/24/84
4,444,470                   06/311,328                   04/24/84
4,444,479                   06/343,160                   04/24/84
4,444,481                   06/328,001                   04/24/84
4,444,484                   06/411,226                   04/24/84
4,444,486                   06/387,061                   04/24/84
4,444,488                   06/337,321                   04/24/84
4,444,492                   06/403,277                   04/24/84
4,444,493                   06/364,333                   04/24/84
4,444,495                   06/258,340                   04/24/84
4,444,506                   06/295,263                   04/24/84
4,444,512                   06/313,516                   04/24/84
4,444,522                   06/391,036                   04/24/84
4,444,529                   06/370,275                   04/24/84
4,444,530                   06/400,441                   04/24/84
4,444,531                   06/326,399                   04/24/84
4,444,533                   06/314,995                   04/24/84
4,444,537                   06/373,484                   04/24/84
4,444,539                   06/365,907                   04/24/84
4,444,540                   06/287,765                   04/24/84
4,444,547                   06/252,393                   04/24/84
4,444,550                   06/435,473                   04/24/84
4,444,554                   06/377,874                   04/24/84
4,444,557                   06/332,240                   04/24/84
4,444,558                   06/426,502                   04/24/84
4,444,567                   06/480,962                   04/24/84
4,444,570                   06/413,187                   04/24/84
4,444,571                   06/472,713                   04/24/84
4,444,572                   06/402,335                   04/24/84
4,444,573                   06/390,294                   04/24/84
4,444,581                   06/449,049                   04/24/84
4,444,589                   06/370,197                   04/24/84
4,444,593                   06/463,259                   04/24/84
4,444,598                   06/434,872                   04/24/84
4,444,600                   06/486,959                   04/24/84
4,444,602                   06/350,578                   04/24/84
4,444,612                   06/244,400                   04/24/84
4,444,613                   06/378,564                   04/24/84
4,444,616                   06/384,111                   04/24/84
4,444,620                   06/531,353                   04/24/84
4,444,627                   06/352,101                   04/24/84
4,444,633                   06/451,241                   04/24/84
4,444,636                   06/270,129                   04/24/84
4,444,641                   06/279,754                   04/24/84
4,444,647                   06/340,501                   04/24/84
4,444,652                   06/311,465                   04/24/84
4,444,663                   06/302,214                   04/24/84
4,444,665                   06/468,093                   04/24/84
4,444,666                   06/419,193                   04/24/84
4,444,668                   06/538,836                   04/24/84
4,444,684                   06/345,989                   04/24/84
4,444,687                   06/484,350                   04/24/84
4,444,691                   06/351,884                   04/24/84
4,444,692                   06/264,886                   04/24/84
4,444,694                   06/487,478                   04/24/84
4,444,702                   06/366,970                   04/24/84
4,444,703                   06/355,939                   04/24/84
4,444,708                   06/389,311                   04/24/84
4,444,714                   06/391,488                   04/24/84
4,444,719                   06/466,902                   04/24/84
4,444,729                   06/393,695                   04/24/84
4,444,730                   06/385,639                   04/24/84
4,444,737                   06/251,765                   04/24/84
4,444,743                   06/302,563                   04/24/84
4,444,746                   06/444,099                   04/24/84
4,444,747                   06/479,528                   04/24/84
4,444,752                   06/417,493                   04/24/84
4,444,756                   06/374,342                   04/24/84
4,444,759                   06/402,117                   04/24/84
4,444,764                   06/246,500                   04/24/84
4,444,767                   06/436,524                   04/24/84
4,444,774                   06/403,185                   04/24/84
4,444,781                   06/447,055                   04/24/84
4,444,788                   06/387,140                   04/24/84
4,444,797                   06/234,377                   04/24/84
4,444,799                   06/293,924                   04/24/84
4,444,802                   06/374,465                   04/24/84
4,444,803                   06/374,466                   04/24/84
4,444,807                   06/518,207                   04/24/84
4,444,808                   06/415,296                   04/24/84
4,444,813                   06/404,204                   04/24/84
4,444,814                   06/387,375                   04/24/84
4,444,815                   06/502,045                   04/24/84
4,444,818                   06/462,178                   04/24/84
4,444,821                   06/438,210                   04/24/84
4,444,827                   06/391,525                   04/24/84
4,444,833                   06/356,542                   04/24/84
4,444,835                   06/422,139                   04/24/84
4,444,848                   06/337,054                   04/24/84
4,444,854                   06/302,309                   04/24/84
4,444,872                   06/406,945                   04/24/84
4,444,875                   06/478,902                   04/24/84
4,444,879                   06/229,448                   04/24/84
4,444,882                   06/324,550                   04/24/84
4,444,883                   06/406,747                   04/24/84
4,444,884                   06/420,982                   04/24/84
4,444,887                   06/243,021                   04/24/84
4,444,889                   06/366,542                   04/24/84
4,444,896                   06/374,977                   04/24/84
4,444,897                   06/374,978                   04/24/84
4,444,901                   06/457,331                   04/24/84
4,444,902                   06/333,370                   04/24/84
4,444,912                   06/396,706                   04/24/84
4,444,915                   06/519,274                   04/24/84
4,444,916                   06/519,276                   04/24/84
4,444,917                   06/519,275                   04/24/84
4,444,921                   06/423,384                   04/24/84
4,444,925                   06/450,332                   04/24/84
4,444,929                   06/444,281                   04/24/84
4,444,934                   06/446,027                   04/24/84
4,444,936                   06/461,432                   04/24/84
4,444,938                   06/385,958                   04/24/84
4,444,940                   06/507,264                   04/24/84
4,444,946                   06/344,083                   04/24/84
4,444,948                   06/357,608                   04/24/84
4,444,952                   06/410,743                   04/24/84
4,444,953                   06/485,768                   04/24/84
4,444,954                   06/431,980                   04/24/84
4,444,955                   06/431,995                   04/24/84
4,444,956                   06/439,863                   04/24/84
4,444,958                   06/368,230                   04/24/84
4,444,966                   06/481,955                   04/24/84
4,444,968                   06/424,803                   04/24/84
4,444,969                   06/410,742                   04/24/84
4,444,972                   06/491,125                   04/24/84
4,444,973                   06/411,751                   04/24/84
4,444,975                   06/520,079                   04/24/84
4,444,977                   06/472,695                   04/24/84
4,444,980                   06/475,579                   04/24/84
4,444,983                   06/368,759                   04/24/84
4,444,984                   06/522,944                   04/24/84
4,444,985                   06/402,489                   04/24/84
4,444,986                   06/307,048                   04/24/84
4,444,988                   06/400,828                   04/24/84
4,445,009                   06/313,082                   04/24/84
4,445,020                   06/479,920                   04/24/84
4,445,022                   06/356,152                   04/24/84
4,445,025                   06/438,053                   04/24/84
4,445,031                   06/232,273                   04/24/84
4,445,034                   06/331,469                   04/24/84
4,445,046                   06/394,010                   04/24/84
4,445,049                   06/334,844                   04/24/84
4,445,057                   06/468,553                   04/24/84
4,445,070                   06/320,838                   04/24/84
4,445,073                   06/360,278                   04/24/84
4,445,080                   06/324,769                   04/24/84
4,445,081                   06/331,108                   04/24/84
4,445,085                   06/449,705                   04/24/84
4,445,086                   06/350,426                   04/24/84
4,445,094                   06/268,412                   04/24/84
4,445,095                   06/348,283                   04/24/84
4,445,097                   06/302,123                   04/24/84
4,445,105                   06/392,527                   04/24/84
4,445,115                   06/301,256                   04/24/84
4,445,118                   06/266,253                   04/24/84
4,445,121                   06/332,132                   04/24/84
4,445,123                   06/354,849                   04/24/84
4,445,128                   06/364,834                   04/24/84
4,445,130                   06/319,401                   04/24/84
4,445,132                   06/270,030                   04/24/84
4,445,135                   06/317,421                   04/24/84
4,445,146                   06/347,486                   04/24/84
4,445,150                   06/322,367                   04/24/84
4,445,160                   06/363,758                   04/24/84
4,445,167                   06/421,346                   04/24/84
4,445,175                   06/301,695                   04/24/84
4,445,181                   06/269,471                   04/24/84
4,445,211                   06/316,252                   04/24/84
4,445,212                   06/316,255                   04/24/84
4,445,216                   06/242,293                   04/24/84
4,445,221                   06/336,975                   04/24/84
4,445,223                   06/222,422                   04/24/84
4,445,229                   06/237,053                   04/24/84
4,737,994                   06/947,610                   04/19/88
4,738,005                   07/004,163                   04/19/88
4,738,008                   06/854,150                   04/19/88
4,738,010                   07/017,211                   04/19/88
4,738,016                   07/020,879                   04/19/88
4,738,017                   06/923,434                   04/19/88
4,738,019                   07/025,750                   04/19/88
4,738,024                   07/088,644                   04/19/88
4,738,029                   06/825,680                   04/19/88
4,738,031                   07/005,030                   04/19/88
4,738,033                   06/883,958                   04/19/88
4,738,036                   07/004,411                   04/19/88
4,738,039                   06/896,178                   04/19/88
4,738,043                   06/908,694                   04/19/88
4,738,044                   06/876,030                   04/19/88
4,738,046                   07/025,993                   04/19/88
4,738,053                   06/924,396                   04/19/88
4,738,054                   06/799,140                   04/19/88
4,738,060                   06/939,353                   04/19/88
4,738,065                   07/000,345                   04/19/88
4,738,070                   06/934,183                   04/19/88
4,738,078                   06/905,973                   04/19/88
4,738,082                   06/774,948                   04/19/88
4,738,083                   06/937,004                   04/19/88
4,738,086                   06/870,760                   04/19/88
4,738,095                   06/914,113                   04/19/88
4,738,102                   06/914,334                   04/19/88
4,738,107                   06/691,529                   04/19/88
4,738,111                   06/804,400                   04/19/88
4,738,112                   06/904,984                   04/19/88
4,738,120                   07/098,783                   04/19/88
4,738,126                   06/864,145                   04/19/88
4,738,129                   06/905,557                   04/19/88
4,738,137                   06/874,319                   04/19/88
4,738,138                   06/916,491                   04/19/88
4,738,140                   06/890,125                   04/19/88
4,738,141                   06/942,652                   04/19/88
4,738,149                   06/843,663                   04/19/88
4,738,153                   06/944,898                   04/19/88
4,738,158                   07/054,214                   04/19/88
4,738,159                   07/011,237                   04/19/88
4,738,161                   06/893,569                   04/19/88
4,738,162                   06/913,985                   04/19/88
4,738,163                   06/771,381                   04/19/88
4,738,167                   06/900,830                   04/19/88
4,738,168                   06/895,799                   04/19/88
4,738,170                   06/946,100                   04/19/88
4,738,171                   07/031,107                   04/19/88
4,738,175                   06/813,121                   04/19/88
4,738,185                   06/886,264                   04/19/88
4,738,200                   06/829,418                   04/19/88
4,738,202                   06/932,969                   04/19/88
4,738,204                   06/898,747                   04/19/88
4,738,210                   06/933,884                   04/19/88
4,738,214                   07/017,743                   04/19/88
4,738,217                   07/041,856                   04/19/88
4,738,218                   06/911,493                   04/19/88
4,738,222                   06/889,426                   04/19/88
4,738,225                   07/056,968                   04/19/88
4,738,227                   06/907,809                   04/19/88
4,738,229                   06/805,740                   04/19/88
4,738,233                   06/832,409                   04/19/88
4,738,234                   07/090,777                   04/19/88
4,738,235                   06/795,659                   04/19/88
4,738,236                   07/035,404                   04/19/88
4,738,250                   06/782,427                   04/19/88
4,738,260                   06/724,584                   04/19/88
4,738,270                   06/931,185                   04/19/88
4,738,271                   06/918,222                   04/19/88
4,738,276                   06/871,560                   04/19/88
4,738,277                   06/872,498                   04/19/88
4,738,279                   06/937,706                   04/19/88
4,738,281                   06/943,772                   04/19/88
4,738,286                   07/031,041                   04/19/88
4,738,287                   07/021,337                   04/19/88
4,738,290                   06/935,573                   04/19/88
4,738,294                   06/919,500                   04/19/88
4,738,300                   07/038,989                   04/19/88
4,738,310                   06/769,602                   04/19/88
4,738,311                   06/919,790                   04/19/88
4,738,314                   06/927,142                   04/19/88
4,738,319                   07/009,154                   04/19/88
4,738,323                   06/930,420                   04/19/88
4,738,325                   06/945,525                   04/19/88
4,738,332                   06/926,315                   04/19/88
4,738,337                   07/079,201                   04/19/88
4,738,339                   07/004,260                   04/19/88
4,738,342                   07/003,251                   04/19/88
4,738,345                   06/917,099                   04/19/88
4,738,351                   06/824,964                   04/19/88
4,738,352                   06/847,224                   04/19/88
4,738,353                   06/923,145                   04/19/88
4,738,354                   06/846,056                   04/19/88
4,738,355                   06/946,000                   04/19/88
4,738,362                   07/099,161                   04/19/88
4,738,363                   06/937,712                   04/19/88
4,738,365                   07/042,680                   04/19/88
4,738,367                   06/901,294                   04/19/88
4,738,369                   06/873,259                   04/19/88
4,738,370                   07/002,349                   04/19/88
4,738,371                   06/926,651                   04/19/88
4,738,374                   06/897,140                   04/19/88
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