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 June 19, 1996
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,667                  06/829,798                   08/20/91
(4,454,953)                (06/365,968)                (06/19/84)
Re. 33,914                  07/533,445                   05/05/92
(4,751,387)                (06/815,810)                (06/14/88)
Re. 33,946                  07/313,717                   06/02/92
(4,750,762)                (07/112,286)                (06/14/88)
Re. 34,048                  07/480,028                   09/01/92
(4,750,929)                (07/081,148)                (06/14/88)
4,454,611                   06/393,586                   06/19/84
4,454,612                   06/291,427                   06/19/84
4,454,629                   06/438,976                   06/19/84
4,454,645                   06/345,503                   06/19/84
4,454,649                   06/352,821                   06/19/84
4,454,659                   06/385,711                   06/19/84
4,454,666                   06/363,216                   06/19/84
4,454,669                   06/322,646                   06/19/84
4,454,670                   06/327,461                   06/19/84
4,454,674                   06/449,345                   06/19/84
4,454,676                   06/248,506                   06/19/84
4,454,688                   06/358,157                   06/19/84
4,454,695                   06/342,467                   06/19/84
4,454,706                   06/412,132                   06/19/84
4,454,710                   06/434,899                   06/19/84
4,454,711                   06/316,326                   06/19/84
4,454,721                   06/417,635                   06/19/84
4,454,724                   06/428,483                   06/19/84
4,454,725                   06/427,406                   06/19/84
4,454,732                   06/491,405                   06/19/84
4,454,735                   06/272,790                   06/19/84
4,454,737                   06/373,795                   06/19/84
4,454,756                   06/442,849                   06/19/84
4,454,757                   06/415,740                   06/19/84
4,454,763                   06/407,568                   06/19/84
4,454,766                   06/299,600                   06/19/84
4,454,768                   06/360,322                   06/19/84
4,454,771                   06/318,361                   06/19/84
4,454,776                   06/318,892                   06/19/84
4,454,781                   06/395,300                   06/19/84
4,454,784                   06/317,342                   06/19/84
4,454,802                   06/311,314                   06/19/84
4,454,803                   06/400,987                   06/19/84
4,454,808                   06/376,579                   06/19/84
4,454,810                   06/367,440                   06/19/84
4,454,813                   06/506,954                   06/19/84
4,454,817                   06/339,238                   06/19/84
4,454,821                   06/317,305                   06/19/84
4,454,828                   06/460,190                   06/19/84
4,454,833                   06/517,158                   06/19/84
4,454,836                   06/498,441                   06/19/84
4,454,839                   06/404,430                   06/19/84
4,454,867                   06/486,931                   06/19/84
4,454,869                   06/402,608                   06/19/84
4,454,870                   06/408,733                   06/19/84
4,454,883                   06/348,888                   06/19/84
4,454,885                   06/275,854                   06/19/84
4,454,891                   06/356,389                   06/19/84
4,454,894                   06/314,338                   06/19/84
4,454,904                   06/385,924                   06/19/84
4,454,911                   06/401,115                   06/19/84
4,454,912                   06/291,147                   06/19/84
4,454,915                   06/391,473                   06/19/84
4,454,919                   06/326,282                   06/19/84
4,454,922                   06/382,375                   06/19/84
4,454,927                   06/332,789                   06/19/84
4,454,936                   06/364,509                   06/19/84
4,454,956                   06/494,854                   06/19/84
4,454,962                   06/330,934                   06/19/84
4,454,976                   06/256,056                   06/19/84
4,454,981                   06/258,319                   06/19/84
4,454,989                   06/325,658                   06/19/84
4,454,991                   06/351,373                   06/19/84
4,454,997                   06/354,775                   06/19/84
4,454,998                   06/295,992                   06/19/84
4,454,999                   06/255,898                   06/19/84
4,455,002                   06/405,146                   06/19/84
4,455,016                   06/423,058                   06/19/84
4,455,017                   06/438,317                   06/19/84
4,455,020                   06/356,250                   06/19/84
4,455,035                   06/349,674                   06/19/84
4,455,039                   06/391,690                   06/19/84
4,455,042                   06/383,100                   06/19/84
4,455,044                   06/264,914                   06/19/84
4,455,051                   06/273,865                   06/19/84
4,455,052                   06/290,846                   06/19/84
4,455,054                   06/359,710                   06/19/84
4,455,055                   06/350,612                   06/19/84
4,455,058                   06/364,152                   06/19/84
4,455,074                   06/477,770                   06/19/84
4,455,077                   06/432,860                   06/19/84
4,455,079                   06/441,795                   06/19/84
4,455,085                   06/292,930                   06/19/84
4,455,096                   06/319,978                   06/19/84
4,455,101                   06/278,530                   06/19/84
4,455,110                   06/350,941                   06/19/84
4,455,111                   06/278,060                   06/19/84
4,455,116                   06/320,159                   06/19/84
4,455,121                   06/438,038                   06/19/84
4,455,137                   06/424,514                   06/19/84
4,455,144                   06/424,095                   06/19/84
4,455,152                   06/468,852                   06/19/84
4,455,155                   06/403,783                   06/19/84
4,455,157                   06/421,568                   06/19/84
4,455,158                   06/477,561                   06/19/84
4,455,164                   06/366,141                   06/19/84
4,455,169                   06/371,848                   06/19/84
4,455,170                   06/475,795                   06/19/84
4,455,175                   06/518,896                   06/19/84
4,455,177                   06/417,553                   06/19/84
4,455,178                   06/512,524                   06/19/84
4,455,179                   06/315,136                   06/19/84
4,455,190                   06/495,301                   06/19/84
4,455,193                   06/508,911                   06/19/84
4,455,200                   06/394,939                   06/19/84
4,455,201                   06/480,061                   06/19/84
4,455,208                   06/516,296                   06/19/84
4,455,209                   06/500,874                   06/19/84
4,455,212                   06/353,163                   06/19/84
4,455,217                   06/324,793                   06/19/84
4,455,223                   06/416,288                   06/19/84
4,455,231                   06/411,102                   06/19/84
4,455,232                   06/361,205                   06/19/84
4,455,237                   06/434,266                   06/19/84
4,455,239                   06/535,558                   06/19/84
4,455,241                   06/349,277                   06/19/84
4,455,244                   06/385,457                   06/19/84
4,455,246                   06/383,212                   06/19/84
4,455,249                   06/435,794                   06/19/84
4,455,254                   06/359,000                   06/19/84
4,455,256                   06/260,726                   06/19/84
4,455,260                   06/461,468                   06/19/84
4,455,262                   06/368,037                   06/19/84
4,455,265                   06/354,336                   06/19/84
4,455,266                   06/396,742                   06/19/84
4,455,277                   06/342,982                   06/19/84
4,455,278                   06/406,901                   06/19/84
4,455,279                   06/400,833                   06/19/84
4,455,282                   06/415,268                   06/19/84
4,455,285                   06/251,119                   06/19/84
4,455,290                   06/250,173                   06/19/84
4,455,291                   06/341,553                   06/19/84
4,455,295                   06/492,076                   06/19/84
4,455,302                   06/359,192                   06/19/84
4,455,306                   06/333,182                   06/19/84
4,455,312                   06/409,761                   06/19/84
4,455,313                   06/409,793                   06/19/84
4,455,315                   06/318,982                   06/19/84
4,455,317                   06/276,465                   06/19/84
4,455,321                   06/522,000                   06/19/84
4,455,337                   06/248,047                   06/19/84
4,455,339                   06/398,188                   06/19/84
4,455,343                   06/220,349                   06/19/84
4,455,348                   06/517,768                   06/19/84
4,455,352                   06/440,119                   06/19/84
4,455,355                   06/405,935                   06/19/84
4,455,364                   06/439,427                   06/19/84
4,455,369                   06/435,150                   06/19/84
4,455,371                   06/354,303                   06/19/84
4,455,376                   06/251,956                   06/19/84
4,455,377                   06/375,936                   06/19/84
4,455,389                   06/477,185                   06/19/84
4,455,395                   06/409,888                   06/19/84
4,455,396                   06/330,695                   06/19/84
4,455,399                   06/460,690                   06/19/84
4,455,401                   06/375,242                   06/19/84
4,455,402                   06/455,763                   06/19/84
4,455,407                   06/473,272                   06/19/84
4,455,408                   06/407,014                   06/19/84
4,455,411                   06/504,215                   06/19/84
4,455,417                   06/395,432                   06/19/84
4,455,418                   06/404,809                   06/19/84
4,455,422                   06/366,335                   06/19/84
4,455,423                   06/432,872                   06/19/84
4,455,432                   06/360,819                   06/19/84
4,455,444                   06/441,142                   06/19/84
4,455,445                   06/451,525                   06/19/84
4,455,451                   06/397,175                   06/19/84
4,455,454                   06/440,660                   06/19/84
4,455,455                   06/445,861                   06/19/84
4,455,457                   06/384,124                   06/19/84
4,455,458                   06/409,871                   06/19/84
4,455,467                   06/304,278                   06/19/84
4,455,468                   06/282,297                   06/19/84
4,455,470                   06/292,759                   06/19/84
4,455,471                   06/340,431                   06/19/84
4,455,480                   06/354,791                   06/19/84
4,455,497                   06/387,482                   06/19/84
4,455,498                   06/409,766                   06/19/84
4,455,501                   06/429,230                   06/19/84
4,455,505                   06/299,792                   06/19/84
4,455,510                   06/380,463                   06/19/84
4,455,513                   06/401,420                   06/19/84
4,455,541                   06/408,999                   06/19/84
4,455,542                   06/471,973                   06/19/84
4,455,545                   06/439,501                   06/19/84
4,455,549                   06/306,975                   06/19/84
4,455,561                   06/443,710                   06/19/84
4,455,569                   06/337,409                   06/19/84
4,455,579                   06/387,413                   06/19/84
4,455,580                   06/360,171                   06/19/84
4,455,581                   06/293,838                   06/19/84
4,455,591                   06/348,401                   06/19/84
4,455,592                   06/477,046                   06/19/84
4,455,593                   06/477,050                   06/19/84
4,455,598                   06/343,936                   06/19/84
4,455,606                   06/302,902                   06/19/84
4,455,611                   06/411,906                   06/19/84
4,455,612                   06/343,356                   06/19/84
4,455,632                   06/315,692                   06/19/84
4,455,636                   06/431,445                   06/19/84
4,455,640                   06/424,912                   06/19/84
4,455,646                   06/412,013                   06/19/84
4,455,647                   06/388,087                   06/19/84
4,455,654                   06/270,926                   06/19/84
4,455,655                   06/306,634                   06/19/84
4,455,666                   06/369,789                   06/19/84
4,455,674                   06/349,340                   06/19/84
4,455,682                   06/365,819                   06/19/84
4,750,220                   06/865,425                   06/14/88
4,750,227                   06/924,216                   06/14/88
4,750,237                   06/926,134                   06/14/88
4,750,240                   06/941,222                   06/14/88
4,750,243                   06/790,203                   06/14/88
4,750,244                   07/022,825                   06/14/88
4,750,249                   06/904,393                   06/14/88
4,750,251                   07/014,283                   06/14/88
4,750,253                   06/944,116                   06/14/88
4,750,254                   06/812,753                   06/14/88
4,750,255                   07/022,663                   06/14/88
4,750,259                   06/911,586                   06/14/88
4,750,263                   06/741,303                   06/14/88
4,750,266                   07/009,086                   06/14/88
4,750,268                   07/039,315                   06/14/88
4,750,270                   07/064,528                   06/14/88
4,750,272                   06/927,705                   06/14/88
4,750,275                   07/058,042                   06/14/88
4,750,278                   07/137,643                   06/14/88
4,750,279                   06/898,245                   06/14/88
4,750,284                   06/875,236                   06/14/88
4,750,286                   07/007,773                   06/14/88
4,750,291                   07/011,807                   06/14/88
4,750,292                   07/037,124                   06/14/88
4,750,293                   06/905,154                   06/14/88
4,750,294                   07/073,100                   06/14/88
4,750,296                   07/016,537                   06/14/88
4,750,299                   07/011,967                   06/14/88
4,750,300                   07/011,000                   06/14/88
4,750,302                   06/935,208                   06/14/88
4,750,304                   06/897,847                   06/14/88
4,750,307                   07/115,560                   06/14/88
4,750,311                   06/895,889                   06/14/88
4,750,312                   07/017,188                   06/14/88
4,750,314                   07/012,111                   06/14/88
4,750,316                   07/068,149                   06/14/88
4,750,318                   07/086,494                   06/14/88
4,750,324                   07/006,111                   06/14/88
4,750,326                   07/003,422                   06/14/88
4,750,329                   06/945,616                   06/14/88
4,750,337                   07/107,813                   06/14/88
4,750,341                   07/057,946                   06/14/88
4,750,345                   07/043,477                   06/14/88
4,750,353                   07/018,659                   06/14/88
4,750,359                   06/295,460                   06/14/88
4,750,361                   07/004,866                   06/14/88
4,750,363                   06/879,262                   06/14/88
4,750,366                   06/843,894                   06/14/88
4,750,367                   07/007,144                   06/14/88
4,750,369                   06/895,892                   06/14/88
4,750,379                   07/032,224                   06/14/88
4,750,380                   06/901,497                   06/14/88
4,750,382                   06/923,221                   06/14/88
4,750,389                   06/903,479                   06/14/88
4,750,394                   07/030,567                   06/14/88
4,750,397                   06/897,388                   06/14/88
4,750,401                   07/014,487                   06/14/88
4,750,402                   07/026,069                   06/14/88
4,750,403                   07/006,849                   06/14/88
4,750,404                   07/034,905                   06/14/88
4,750,406                   06/924,796                   06/14/88
4,750,410                   07/115,163                   06/14/88
4,750,412                   07/041,415                   06/14/88
4,750,423                   07/025,046                   06/14/88
4,750,424                   07/023,024                   06/14/88
4,750,426                   07/061,097                   06/14/88
4,750,439                   06/900,932                   06/14/88
4,750,442                   06/889,282                   06/14/88
4,750,444                   07/012,818                   06/14/88
4,750,448                   06/947,103                   06/14/88
4,750,453                   06/397,525                   06/14/88
4,750,454                   06/922,795                   06/14/88
4,750,458                   06/946,011                   06/14/88
4,750,460                   06/877,096                   06/14/88
4,750,462                   06/873,002                   06/14/88
4,750,463                   07/004,903                   06/14/88
4,750,471                   06/879,232                   06/14/88
4,750,472                   06/613,452                   06/14/88
4,750,474                   06/863,945                   06/14/88
4,750,479                   07/030,240                   06/14/88
4,750,485                   06/938,616                   06/14/88
4,750,486                   06/895,831                   06/14/88
4,750,491                   06/670,396                   06/14/88
4,750,496                   07/007,776                   06/14/88
4,750,497                   06/825,796                   06/14/88
4,750,500                   06/903,338                   06/14/88
4,750,501                   06/931,798                   06/14/88
4,750,502                   06/893,923                   06/14/88
4,750,505                   06/856,938                   06/14/88
4,750,506                   06/945,823                   06/14/88
4,750,508                   06/894,263                   06/14/88
4,750,520                   07/107,293                   06/14/88
4,750,531                   06/926,931                   06/14/88
4,750,538                   06/946,155                   06/14/88
4,750,539                   06/927,715                   06/14/88
4,750,540                   06/842,232                   06/14/88
4,750,541                   06/881,631                   06/14/88
4,750,543                   07/032,679                   06/14/88
4,750,544                   06/901,441                   06/14/88
4,750,545                   06/942,767                   06/14/88
4,750,552                   06/905,462                   06/14/88
4,750,556                   06/924,484                   06/14/88
4,750,559                   06/738,213                   06/14/88
4,750,560                   07/037,811                   06/14/88
4,750,571                   06/916,507                   06/14/88
4,750,574                   07/009,888                   06/14/88
4,750,575                   07/026,795                   06/14/88
4,750,576                   06/937,834                   06/14/88
4,750,577                   06/893,932                   06/14/88
4,750,580                   06/928,561                   06/14/88
4,750,582                   07/064,871                   06/14/88
4,750,585                   07/057,776                   06/14/88
4,750,587                   07/109,090                   06/14/88
4,750,592                   07/028,390                   06/14/88
4,750,594                   06/891,219                   06/14/88
4,750,608                   06/854,148                   06/14/88
4,750,611                   06/785,154                   06/14/88
4,750,618                   06/865,880                   06/14/88
4,750,619                   07/083,485                   06/14/88
4,750,621                   07/019,559                   06/14/88
4,750,631                   06/887,667                   06/14/88
4,750,633                   07/100,338                   06/14/88
4,750,634                   06/858,931                   06/14/88
4,750,635                   07/093,694                   06/14/88
4,750,636                   07/100,624                   06/14/88
4,750,638                   07/139,585                   06/14/88
4,750,644                   06/897,988                   06/14/88
4,750,650                   06/741,159                   06/14/88
4,750,651                   07/055,424                   06/14/88
4,750,653                   06/940,157                   06/14/88
4,750,654                   07/051,251                   06/14/88
4,750,655                   06/913,706                   06/14/88
4,750,661                   06/873,803                   06/14/88
4,750,663                   06/909,176                   06/14/88
4,750,671                   07/106,448                   06/14/88
4,750,674                   06/901,311                   06/14/88
4,750,677                   06/907,307                   06/14/88
4,750,678                   07/009,465                   06/14/88
4,750,682                   07/013,508                   06/14/88
4,750,685                   06/906,991                   06/14/88
4,750,690                   07/025,180                   06/14/88
4,750,692                   07/035,326                   06/14/88
4,750,694                   06/854,089                   06/14/88
4,750,695                   07/049,837                   06/14/88
4,750,696                   07/038,678                   06/14/88
4,750,702                   06/889,269                   06/14/88
4,750,703                   07/088,401                   06/14/88
4,750,707                   07/098,019                   06/14/88
4,750,721                   06/925,479                   06/14/88
4,750,723                   07/093,423                   06/14/88
4,750,724                   07/043,854                   06/14/88
4,750,728                   06/804,519                   06/14/88
4,750,730                   06/936,742                   06/14/88
4,750,735                   06/917,163                   06/14/88
4,750,737                   06/890,416                   06/14/88
4,750,740                   06/803,223                   06/14/88
4,750,742                   06/875,439                   06/14/88
4,750,744                   06/869,710                   06/14/88
4,750,756                   07/020,601                   06/14/88
4,750,758                   06/931,037                   06/14/88
4,750,761                   07/018,300                   06/14/88
4,750,763                   06/864,515                   06/14/88
4,750,767                   07/028,391                   06/14/88
4,750,768                   06/863,308                   06/14/88
4,750,773                   07/051,280                   06/14/88
4,750,775                   07/049,842                   06/14/88
4,750,777                   06/930,670                   06/14/88
4,750,778                   07/089,078                   06/14/88
4,750,783                   06/898,355                   06/14/88
4,750,784                   07/067,277                   06/14/88
4,750,786                   07/046,287                   06/14/88
4,750,788                   06/884,195                   06/14/88
4,750,789                   07/035,258                   06/14/88
4,750,790                   06/944,242                   06/14/88
4,750,795                   06/744,502                   06/14/88
4,750,797                   06/886,860                   06/14/88
4,750,803                   06/841,131                   06/14/88
4,750,805                   07/013,525                   06/14/88
4,750,807                   06/932,123                   06/14/88
4,750,818                   06/809,214                   06/14/88
4,750,834                   07/106,913                   06/14/88
4,750,841                   07/090,048                   06/14/88
4,750,843                   06/797,427                   06/14/88
4,750,850                   07/045,838                   06/14/88
4,750,858                   06/768,537                   06/14/88
4,750,862                   06/936,046                   06/14/88
4,750,866                   06/945,819                   06/14/88
4,750,890                   07/063,652                   06/14/88
4,750,892                   07/004,081                   06/14/88
4,750,899                   06/774,347                   06/14/88
4,750,904                   06/846,705                   06/14/88
4,750,909                   06/946,945                   06/14/88
4,750,910                   07/004,708                   06/14/88
4,750,911                   06/911,720                   06/14/88
4,750,914                   07/062,087                   06/14/88
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