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 12, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,415                  07/458,160                   10/30/90
(4,810,924)                (07/053,721)                (03/07/89)
Re. 34,315                  07/666,150                   07/20/93
(4,809,539)                (07/210,352)                (03/07/89)
Re. 34,318                  07/666,118                   07/20/93
(4,811,172)                (07/123,844)                (03/07/89)
Re. 34,346                  07/359,834                   08/17/93
(4,811,159)                (07/162,818)                (03/07/89)
4,503,568                   06/325,057                   03/12/85
4,503,571                   06/459,798                   03/12/85
4,503,572                   06/419,187                   03/12/85
4,503,575                   06/446,225                   03/12/85
4,503,577                   06/388,492                   03/12/85
4,503,581                   06/473,545                   03/12/85
4,503,585                   06/484,938                   03/12/85
4,503,588                   06/448,725                   03/12/85
4,503,599                   06/462,014                   03/12/85
4,503,603                   06/492,459                   03/12/85
4,503,605                   06/524,227                   03/12/85
4,503,615                   06/467,315                   03/12/85
4,503,617                   06/474,476                   03/12/85
4,503,622                   06/486,631                   03/12/85
4,503,626                   06/433,805                   03/12/85
4,503,629                   06/572,915                   03/12/85
4,503,630                   06/532,494                   03/12/85
4,503,638                   06/517,788                   03/12/85
4,503,642                   06/491,277                   03/12/85
4,503,645                   06/493,148                   03/12/85
4,503,646                   06/499,303                   03/12/85
4,503,650                   06/467,379                   03/12/85
4,503,654                   06/422,649                   03/12/85
4,503,656                   06/441,304                   03/12/85
4,503,658                   06/479,360                   03/12/85
4,503,662                   06/420,858                   03/12/85
4,503,670                   06/396,284                   03/12/85
4,503,671                   06/507,030                   03/12/85
4,503,677                   06/380,203                   03/12/85
4,503,681                   06/513,934                   03/12/85
4,503,698                   06/497,555                   03/12/85
4,503,703                   06/413,743                   03/12/85
4,503,706                   06/495,034                   03/12/85
4,503,711                   06/537,973                   03/12/85
4,503,714                   06/467,471                   03/12/85
4,503,718                   06/365,052                   03/12/85
4,503,726                   06/274,912                   03/12/85
4,503,734                   06/402,235                   03/12/85
4,503,735                   06/430,995                   03/12/85
4,503,736                   06/473,961                   03/12/85
4,503,740                   06/340,506                   03/12/85
4,503,748                   06/542,454                   03/12/85
4,503,755                   06/418,310                   03/12/85
4,503,760                   06/308,158                   03/12/85
4,503,788                   06/423,485                   03/12/85
4,503,793                   06/525,869                   03/12/85
4,503,795                   06/578,609                   03/12/85
4,503,803                   06/587,628                   03/12/85
4,503,815                   06/383,939                   03/12/85
4,503,820                   06/436,414                   03/12/85
4,503,838                   06/418,213                   03/12/85
4,503,839                   06/501,794                   03/12/85
4,503,854                   06/504,940                   03/12/85
4,503,858                   06/504,699                   03/12/85
4,503,865                   06/452,040                   03/12/85
4,503,871                   06/422,553                   03/12/85
4,503,877                   06/394,907                   03/12/85
4,503,878                   06/490,183                   03/12/85
4,503,879                   06/548,606                   03/12/85
4,503,880                   06/395,857                   03/12/85
4,503,882                   06/484,925                   03/12/85
4,503,883                   06/620,764                   03/12/85
4,503,884                   06/602,093                   03/12/85
4,503,889                   06/496,403                   03/12/85
4,503,892                   06/471,638                   03/12/85
4,503,908                   06/375,512                   03/12/85
4,503,909                   06/532,741                   03/12/85
4,503,912                   06/503,994                   03/12/85
4,503,919                   06/465,780                   03/12/85
4,503,923                   06/474,282                   03/12/85
4,503,928                   06/326,095                   03/12/85
4,503,930                   06/414,662                   03/12/85
4,503,932                   06/337,185                   03/12/85
4,503,941                   06/578,264                   03/12/85
4,503,944                   06/380,405                   03/12/85
4,503,947                   06/438,143                   03/12/85
4,503,948                   06/438,191                   03/12/85
4,503,958                   06/423,717                   03/12/85
4,503,959                   06/297,297                   03/12/85
4,503,961                   06/448,004                   03/12/85
4,503,974                   06/535,764                   03/12/85
4,503,977                   06/375,012                   03/12/85
4,503,982                   06/495,762                   03/12/85
4,503,988                   06/651,665                   03/12/85
4,503,990                   06/587,099                   03/12/85
4,503,991                   06/568,623                   03/12/85
4,503,998                   06/472,152                   03/12/85
4,503,999                   06/404,775                   03/12/85
4,504,013                   06/410,590                   03/12/85
4,504,016                   06/510,469                   03/12/85
4,504,017                   06/502,383                   03/12/85
4,504,018                   06/449,054                   03/12/85
4,504,019                   06/354,286                   03/12/85
4,504,022                   06/471,562                   03/12/85
4,504,039                   06/478,584                   03/12/85
4,504,048                   06/441,131                   03/12/85
4,504,053                   06/343,514                   03/12/85
4,504,055                   06/456,728                   03/12/85
4,504,056                   06/433,030                   03/12/85
4,504,058                   06/461,457                   03/12/85
4,504,065                   06/568,573                   03/12/85
4,504,067                   06/615,159                   03/12/85
4,504,074                   06/502,258                   03/12/85
4,504,076                   06/532,866                   03/12/85
4,504,080                   06/494,825                   03/12/85
4,504,081                   06/429,313                   03/12/85
4,504,092                   06/355,057                   03/12/85
4,504,093                   06/508,274                   03/12/85
4,504,101                   06/527,637                   03/12/85
4,504,104                   06/541,803                   03/12/85
4,504,108                   06/533,679                   03/12/85
4,504,109                   06/442,972                   03/12/85
4,504,117                   06/484,164                   03/12/85
4,504,118                   06/450,635                   03/12/85
4,504,121                   06/317,362                   03/12/85
4,504,123                   06/308,330                   03/12/85
4,504,126                   06/538,969                   03/12/85
4,504,130                   06/424,841                   03/12/85
4,504,138                   06/315,542                   03/12/85
4,504,139                   06/432,838                   03/12/85
4,504,142                   06/535,429                   03/12/85
4,504,145                   06/411,370                   03/12/85
4,504,151                   06/530,697                   03/12/85
4,504,155                   06/585,205                   03/12/85
4,504,156                   06/395,516                   03/12/85
4,504,158                   06/454,288                   03/12/85
4,504,160                   06/370,936                   03/12/85
4,504,161                   06/430,082                   03/12/85
4,504,167                   06/542,328                   03/12/85
4,504,169                   06/495,933                   03/12/85
4,504,171                   06/528,931                   03/12/85
4,504,181                   06/417,980                   03/12/85
4,504,191                   06/437,540                   03/12/85
4,504,192                   06/532,430                   03/12/85
4,504,195                   06/506,000                   03/12/85
4,504,209                   06/556,838                   03/12/85
4,504,226                   06/359,377                   03/12/85
4,504,238                   06/452,849                   03/12/85
4,504,244                   06/455,694                   03/12/85
4,504,251                   06/440,956                   03/12/85
4,504,266                   06/475,469                   03/12/85
4,504,269                   06/471,211                   03/12/85
4,504,275                   06/478,480                   03/12/85
4,504,276                   06/478,481                   03/12/85
4,504,285                   06/485,233                   03/12/85
4,504,290                   06/620,761                   03/12/85
4,504,294                   06/511,856                   03/12/85
4,504,298                   06/542,900                   03/12/85
4,504,301                   06/430,318                   03/12/85
4,504,302                   06/490,979                   03/12/85
4,504,306                   06/550,732                   03/12/85
4,504,307                   06/576,030                   03/12/85
4,504,314                   06/554,711                   03/12/85
4,504,315                   06/582,625                   03/12/85
4,504,317                   06/472,526                   03/12/85
4,504,321                   06/581,419                   03/12/85
4,504,322                   06/435,572                   03/12/85
4,504,323                   06/513,614                   03/12/85
4,504,324                   06/549,545                   03/12/85
4,504,330                   06/543,555                   03/12/85
4,504,334                   06/564,872                   03/12/85
4,504,340                   06/517,533                   03/12/85
4,504,346                   06/541,315                   03/12/85
4,504,347                   06/257,412                   03/12/85
4,504,350                   06/514,235                   03/12/85
4,504,355                   06/441,891                   03/12/85
4,504,357                   06/545,498                   03/12/85
4,504,360                   06/608,274                   03/12/85
4,504,364                   06/392,568                   03/12/85
4,504,365                   06/438,106                   03/12/85
4,504,367                   06/495,237                   03/12/85
4,504,369                   06/578,021                   03/12/85
4,504,370                   06/576,900                   03/12/85
4,504,383                   06/578,357                   03/12/85
4,504,388                   06/503,902                   03/12/85
4,504,393                   06/618,549                   03/12/85
4,504,394                   06/525,949                   03/12/85
4,504,396                   06/358,283                   03/12/85
4,504,403                   06/606,854                   03/12/85
4,504,407                   06/526,785                   03/12/85
4,504,410                   06/389,261                   03/12/85
4,504,411                   06/514,327                   03/12/85
4,504,414                   06/479,645                   03/12/85
4,504,419                   06/431,497                   03/12/85
4,504,428                   06/481,931                   03/12/85
4,504,432                   06/572,610                   03/12/85
4,504,440                   06/535,130                   03/12/85
4,504,444                   06/315,323                   03/12/85
4,504,448                   06/583,904                   03/12/85
4,504,451                   06/513,902                   03/12/85
4,504,460                   06/402,226                   03/12/85
4,504,461                   06/528,885                   03/12/85
4,504,462                   06/387,136                   03/12/85
4,504,463                   06/387,139                   03/12/85
4,504,471                   06/529,680                   03/12/85
4,504,481                   06/565,923                   03/12/85
4,504,483                   06/408,912                   03/12/85
4,504,485                   06/481,551                   03/12/85
4,504,490                   06/528,842                   03/12/85
4,504,491                   06/395,295                   03/12/85
4,504,493                   06/514,224                   03/12/85
4,504,494                   06/459,647                   03/12/85
4,504,502                   06/482,678                   03/12/85
4,504,509                   06/402,429                   03/12/85
4,504,510                   06/382,996                   03/12/85
4,504,512                   06/568,372                   03/12/85
4,504,513                   06/448,523                   03/12/85
4,504,515                   06/484,006                   03/12/85
4,504,519                   06/548,040                   03/12/85
4,504,522                   06/589,790                   03/12/85
4,504,527                   06/349,118                   03/12/85
4,504,528                   06/512,718                   03/12/85
4,504,529                   06/389,934                   03/12/85
4,504,543                   06/515,932                   03/12/85
4,504,544                   06/551,262                   03/12/85
4,504,552                   06/590,319                   03/12/85
4,504,556                   06/547,227                   03/12/85
4,504,562                   06/507,901                   03/12/85
4,504,567                   06/639,539                   03/12/85
4,504,575                   06/547,473                   03/12/85
4,504,576                   06/466,584                   03/12/85
4,504,584                   06/379,851                   03/12/85
4,504,585                   06/364,031                   03/12/85
4,504,592                   06/560,513                   03/12/85
4,504,594                   06/449,908                   03/12/85
4,504,596                   06/574,809                   03/12/85
4,504,598                   06/606,612                   03/12/85
4,504,599                   06/551,741                   03/12/85
4,504,608                   06/461,228                   03/12/85
4,504,613                   06/524,824                   03/12/85
4,504,616                   06/518,078                   03/12/85
4,504,626                   06/421,786                   03/12/85
4,504,632                   06/567,334                   03/12/85
4,504,634                   06/452,907                   03/12/85
4,504,650                   06/558,176                   03/12/85
4,504,651                   06/554,248                   03/12/85
4,504,656                   06/527,748                   03/12/85
4,504,669                   06/541,837                   03/12/85
4,504,675                   06/436,467                   03/12/85
4,504,678                   06/455,143                   03/12/85
4,504,680                   06/541,363                   03/12/85
4,504,691                   06/616,376                   03/12/85
4,504,693                   06/616,379                   03/12/85
4,504,696                   06/481,755                   03/12/85
4,504,703                   06/641,416                   03/12/85
4,504,704                   06/527,722                   03/12/85
4,504,707                   06/475,156                   03/12/85
4,504,708                   06/558,957                   03/12/85
4,504,718                   06/533,917                   03/12/85
4,504,723                   06/559,673                   03/12/85
4,504,725                   06/558,804                   03/12/85
4,504,727                   06/454,913                   03/12/85
4,504,728                   06/411,483                   03/12/85
4,504,733                   06/610,447                   03/12/85
4,504,734                   06/550,295                   03/12/85
4,504,735                   06/495,266                   03/12/85
4,504,736                   06/388,844                   03/12/85
4,504,742                   06/371,292                   03/12/85
4,504,748                   06/310,976                   03/12/85
4,504,750                   06/486,965                   03/12/85
4,504,751                   06/559,190                   03/12/85
4,504,765                   06/377,458                   03/12/85
4,504,767                   06/415,627                   03/12/85
4,504,769                   06/314,419                   03/12/85
4,504,787                   06/365,226                   03/12/85
4,504,792                   06/462,961                   03/12/85
4,504,803                   06/393,020                   03/12/85
4,504,804                   06/393,229                   03/12/85
4,504,810                   06/407,880                   03/12/85
4,504,811                   06/441,134                   03/12/85
4,504,819                   06/428,224                   03/12/85
4,504,820                   06/373,035                   03/12/85
4,504,827                   06/424,734                   03/12/85
4,504,828                   06/406,654                   03/12/85
4,504,834                   06/452,167                   03/12/85
4,504,839                   06/633,665                   03/12/85
4,504,842                   06/460,584                   03/12/85
4,504,848                   06/616,800                   03/12/85
4,504,850                   06/308,320                   03/12/85
4,504,858                   06/424,458                   03/12/85
4,504,862                   06/439,011                   03/12/85
4,504,870                   06/399,571                   03/12/85
4,504,871                   06/342,124                   03/12/85
4,504,881                   06/448,775                   03/12/85
4,504,887                   06/481,115                   03/12/85
4,504,907                   06/469,610                   03/12/85
4,504,910                   06/325,303                   03/12/85
4,504,924                   06/392,828                   03/12/85
4,504,929                   06/444,499                   03/12/85
4,504,930                   06/414,109                   03/12/85
4,504,932                   06/346,698                   03/12/85
4,504,933                   06/417,911                   03/12/85
4,504,934                   06/305,346                   03/12/85
4,504,935                   06/483,804                   03/12/85
4,504,938                   06/367,035                   03/12/85
4,504,947                   06/506,573                   03/12/85
4,504,950                   06/353,903                   03/12/85
4,504,951                   06/383,600                   03/12/85
4,504,954                   06/383,256                   03/12/85
4,504,956                   06/427,974                   03/12/85
4,504,969                   06/357,123                   03/12/85
4,504,972                   06/342,898                   03/12/85
4,504,975                   06/457,224                   03/12/85
4,809,365                   07/035,824                   03/07/89
4,809,366                   07/140,607                   03/07/89
4,809,370                   07/214,937                   03/07/89
4,809,373                   07/084,886                   03/07/89
4,809,378                   07/203,256                   03/07/89
4,809,381                   07/148,067                   03/07/89
4,809,394                   07/091,602                   03/07/89
4,809,397                   06/821,543                   03/07/89
4,809,401                   07/037,624                   03/07/89
4,809,407                   07/131,638                   03/07/89
4,809,412                   07/046,090                   03/07/89
4,809,414                   07/120,544                   03/07/89
4,809,415                   07/011,039                   03/07/89
4,809,416                   07/063,269                   03/07/89
4,809,429                   07/109,598                   03/07/89
4,809,435                   07/139,131                   03/07/89
4,809,444                   07/098,627                   03/07/89
4,809,448                   07/090,883                   03/07/89
4,809,458                   07/018,088                   03/07/89
4,809,459                   06/925,675                   03/07/89
4,809,461                   06/634,742                   03/07/89
4,809,467                   07/007,949                   03/07/89
4,809,475                   06/929,850                   03/07/89
4,809,478                   07/122,036                   03/07/89
4,809,484                   07/156,165                   03/07/89
4,809,492                   07/096,032                   03/07/89
4,809,493                   06/921,117                   03/07/89
4,809,505                   07/075,136                   03/07/89
4,809,507                   06/924,030                   03/07/89
4,809,515                   07/177,150                   03/07/89
4,809,522                   07/223,421                   03/07/89
4,809,525                   07/198,481                   03/07/89
4,809,527                   06/886,631                   03/07/89
4,809,528                   07/091,050                   03/07/89
4,809,530                   07/128,038                   03/07/89
4,809,531                   06/275,030                   03/07/89
4,809,532                   07/109,514                   03/07/89
4,809,534                   07/139,803                   03/07/89
4,809,535                   07/062,802                   03/07/89
4,809,536                   07/110,662                   03/07/89
4,809,537                   07/005,109                   03/07/89
4,809,542                   07/141,557                   03/07/89
4,809,543                   07/101,232                   03/07/89
4,809,546                   07/085,519                   03/07/89
4,809,548                   07/034,046                   03/07/89
4,809,558                   07/019,444                   03/07/89
4,809,563                   07/110,788                   03/07/89
4,809,566                   07/171,020                   03/07/89
4,809,569                   07/139,586                   03/07/89
4,809,571                   07/087,020                   03/07/89
4,809,574                   07/198,649                   03/07/89
4,809,579                   07/194,298                   03/07/89
4,809,580                   07/109,488                   03/07/89
4,809,585                   06/723,350                   03/07/89
4,809,588                   07/138,929                   03/07/89
4,809,597                   07/049,956                   03/07/89
4,809,601                   07/100,202                   03/07/89
4,809,606                   07/064,226                   03/07/89
4,809,607                   07/048,752                   03/07/89
4,809,610                   06/921,203                   03/07/89
4,809,612                   07/034,989                   03/07/89
4,809,615                   07/155,896                   03/07/89
4,809,616                   07/045,226                   03/07/89
4,809,622                   07/135,505                   03/07/89
4,809,630                   07/031,007                   03/07/89
4,809,632                   07/134,053                   03/07/89
4,809,637                   06/924,804                   03/07/89
4,809,638                   07/115,299                   03/07/89
4,809,644                   07/020,513                   03/07/89
4,809,649                   07/124,174                   03/07/89
4,809,656                   07/038,119                   03/07/89
4,809,666                   06/820,129                   03/07/89
4,809,669                   07/194,393                   03/07/89
4,809,673                   07/129,515                   03/07/89
4,809,677                   07/096,565                   03/07/89
4,809,682                   06/940,023                   03/07/89
4,809,688                   07/038,850                   03/07/89
4,809,693                   07/075,106                   03/07/89
4,809,702                   07/119,062                   03/07/89
4,809,704                   07/035,910                   03/07/89
4,809,705                   06/785,576                   03/07/89
4,809,706                   07/143,191                   03/07/89
4,809,708                   07/085,471                   03/07/89
4,809,711                   06/927,829                   03/07/89
4,809,712                   06/912,572                   03/07/89
4,809,714                   06/892,272                   03/07/89
4,809,720                   07/129,478                   03/07/89
4,809,727                   07/198,014                   03/07/89
4,809,729                   07/146,486                   03/07/89
4,809,742                   07/182,400                   03/07/89
4,809,745                   07/118,392                   03/07/89
4,809,750                   07/129,312                   03/07/89
4,809,752                   07/044,838                   03/07/89
4,809,754                   07/178,965                   03/07/89
4,809,755                   07/232,304                   03/07/89
4,809,757                   07/054,710                   03/07/89
4,809,760                   06/323,063                   03/07/89
4,809,761                   07/142,986                   03/07/89
4,809,769                   07/212,174                   03/07/89
4,809,775                   07/177,432                   03/07/89
4,809,778                   07/089,717                   03/07/89
4,809,797                   07/143,557                   03/07/89
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