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 January 22, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

4,494,252                   06/525,306                   01/22/85
4,494,253                   06/567,806                   01/22/85
4,494,256                   06/432,775                   01/22/85
4,494,267                   06/440,002                   01/22/85
4,494,270                   06/478,887                   01/22/85
4,494,271                   06/326,053                   01/22/85
4,494,274                   06/447,740                   01/22/85
4,494,287                   06/466,166                   01/22/85
4,494,296                   06/510,770                   01/22/85
4,494,298                   06/380,997                   01/22/85
4,494,300                   06/280,148                   01/22/85
4,494,302                   06/494,610                   01/22/85
4,494,304                   06/585,584                   01/22/85
4,494,305                   06/444,644                   01/22/85
4,494,306                   06/452,718                   01/22/85
4,494,307                   06/455,630                   01/22/85
4,494,308                   06/386,698                   01/22/85
4,494,318                   06/499,369                   01/22/85
4,494,335                   06/471,165                   01/22/85
4,494,338                   06/536,514                   01/22/85
4,494,339                   06/442,204                   01/22/85
4,494,341                   06/412,018                   01/22/85
4,494,346                   06/438,532                   01/22/85
4,494,350                   06/420,354                   01/22/85
4,494,356                   06/404,017                   01/22/85
4,494,359                   06/338,568                   01/22/85
4,494,364                   06/550,717                   01/22/85
4,494,366                   06/466,725                   01/22/85
4,494,379                   06/487,350                   01/22/85
4,494,382                   06/540,270                   01/22/85
4,494,383                   06/468,992                   01/22/85
4,494,386                   06/358,056                   01/22/85
4,494,389                   06/568,436                   01/22/85
4,494,390                   06/514,241                   01/22/85
4,494,391                   06/524,850                   01/22/85
4,494,392                   06/442,985                   01/22/85
4,494,406                   06/452,790                   01/22/85
4,494,408                   06/402,450                   01/22/85
4,494,413                   06/414,084                   01/22/85
4,494,415                   06/361,601                   01/22/85
4,494,417                   06/426,964                   01/22/85
4,494,419                   06/397,442                   01/22/85
4,494,425                   06/477,436                   01/22/85
4,494,428                   06/352,641                   01/22/85
4,494,435                   06/535,297                   01/22/85
4,494,438                   06/459,295                   01/22/85
4,494,443                   06/459,216                   01/22/85
4,494,445                   06/554,679                   01/22/85
4,494,446                   06/496,942                   01/22/85
4,494,453                   06/553,369                   01/22/85
4,494,460                   06/395,430                   01/22/85
4,494,461                   06/337,560                   01/22/85
4,494,466                   06/343,547                   01/22/85
4,494,468                   06/565,090                   01/22/85
4,494,479                   06/459,045                   01/22/85
4,494,486                   06/535,506                   01/22/85
4,494,488                   06/613,219                   01/22/85
4,494,489                   06/521,371                   01/22/85
4,494,500                   06/383,511                   01/22/85
4,494,503                   06/456,807                   01/22/85
4,494,504                   06/386,611                   01/22/85
4,494,506                   06/463,044                   01/22/85
4,494,508                   06/541,824                   01/22/85
4,494,516                   06/530,759                   01/22/85
4,494,522                   06/490,342                   01/22/85
4,494,532                   06/498,142                   01/22/85
4,494,550                   06/338,507                   01/22/85
4,494,551                   06/441,175                   01/22/85
4,494,561                   06/431,078                   01/22/85
4,494,568                   06/526,732                   01/22/85
4,494,569                   06/487,873                   01/22/85
4,494,570                   06/472,128                   01/22/85
4,494,572                   06/430,077                   01/22/85
4,494,573                   06/379,992                   01/22/85
4,494,579                   06/549,930                   01/22/85
4,494,580                   06/421,317                   01/22/85
4,494,581                   06/467,905                   01/22/85
4,494,582                   06/482,150                   01/22/85
4,494,584                   06/445,741                   01/22/85
4,494,589                   06/408,172                   01/22/85
4,494,590                   06/430,500                   01/22/85
4,494,591                   06/531,978                   01/22/85
4,494,592                   06/476,356                   01/22/85
4,494,593                   06/481,288                   01/22/85
4,494,603                   06/543,551                   01/22/85
4,494,606                   06/496,349                   01/22/85
4,494,618                   06/430,986                   01/22/85
4,494,621                   06/415,841                   01/22/85
4,494,623                   06/408,685                   01/22/85
4,494,626                   06/440,847                   01/22/85
4,494,634                   06/336,021                   01/22/85
4,494,646                   06/435,326                   01/22/85
4,494,648                   06/409,186                   01/22/85
4,494,651                   06/484,321                   01/22/85
4,494,655                   06/349,688                   01/22/85
4,494,663                   06/568,325                   01/22/85
4,494,664                   06/470,535                   01/22/85
4,494,666                   06/550,367                   01/22/85
4,494,684                   06/396,834                   01/22/85
4,494,690                   06/491,110                   01/22/85
4,494,700                   06/552,809                   01/22/85
4,494,701                   06/430,190                   01/22/85
4,494,704                   06/457,476                   01/22/85
4,494,709                   06/526,901                   01/22/85
4,494,713                   06/391,577                   01/22/85
4,494,720                   06/330,716                   01/22/85
4,494,721                   06/463,528                   01/22/85
4,494,732                   06/439,655                   01/22/85
4,494,745                   06/331,245                   01/22/85
4,494,746                   06/431,238                   01/22/85
4,494,748                   06/335,651                   01/22/85
4,494,751                   06/433,678                   01/22/85
4,494,758                   06/592,180                   01/22/85
4,494,761                   06/485,042                   01/22/85
4,494,764                   06/461,622                   01/22/85
4,494,767                   06/373,844                   01/22/85
4,494,771                   06/523,964                   01/22/85
4,494,772                   06/494,081                   01/22/85
4,494,775                   06/431,832                   01/22/85
4,494,776                   06/496,883                   01/22/85
4,494,787                   06/517,146                   01/22/85
4,494,790                   06/373,167                   01/22/85
4,494,793                   06/419,156                   01/22/85
4,494,798                   06/419,823                   01/22/85
4,494,800                   06/377,408                   01/22/85
4,494,809                   06/466,406                   01/22/85
4,494,811                   06/431,702                   01/22/85
4,494,812                   06/444,425                   01/22/85
4,494,814                   06/408,147                   01/22/85
4,494,823                   06/447,362                   01/22/85
4,494,830                   06/405,905                   01/22/85
4,494,834                   06/378,856                   01/22/85
4,494,836                   06/368,014                   01/22/85
4,494,841                   06/531,375                   01/22/85
4,494,843                   06/434,627                   01/22/85
4,494,846                   06/436,567                   01/22/85
4,494,858                   06/489,615                   01/22/85
4,494,859                   06/482,524                   01/22/85
4,494,866                   06/449,388                   01/22/85
4,494,867                   06/514,634                   01/22/85
4,494,868                   06/409,260                   01/22/85
4,494,876                   06/349,460                   01/22/85
4,494,878                   06/513,770                   01/22/85
4,494,881                   06/356,869                   01/22/85
4,494,882                   06/429,865                   01/22/85
4,494,888                   06/400,663                   01/22/85
4,494,891                   06/378,304                   01/22/85
4,494,893                   06/475,399                   01/22/85
4,494,900                   06/486,707                   01/22/85
4,494,905                   06/386,318                   01/22/85
4,494,907                   06/362,824                   01/22/85
4,494,910                   06/360,214                   01/22/85
4,494,915                   06/317,501                   01/22/85
4,494,916                   06/439,058                   01/22/85
4,494,922                   06/511,650                   01/22/85
4,494,929                   06/475,489                   01/22/85
4,494,935                   06/566,715                   01/22/85
4,494,937                   06/465,700                   01/22/85
4,494,948                   06/395,209                   01/22/85
4,494,956                   06/559,121                   01/22/85
4,494,957                   06/493,314                   01/22/85
4,494,958                   06/519,703                   01/22/85
4,494,968                   06/538,325                   01/22/85
4,494,969                   06/538,326                   01/22/85
4,494,975                   06/446,291                   01/22/85
4,494,994                   06/479,715                   01/22/85
4,494,998                   06/411,953                   01/22/85
4,495,003                   06/456,982                   01/22/85
4,495,008                   06/353,444                   01/22/85
4,495,012                   06/505,310                   01/22/85
4,495,014                   06/467,649                   01/22/85
4,495,017                   06/478,880                   01/22/85
4,495,018                   06/514,154                   01/22/85
4,495,020                   06/466,555                   01/22/85
4,495,024                   06/491,318                   01/22/85
4,495,033                   06/285,354                   01/22/85
4,495,036                   06/512,263                   01/22/85
4,495,037                   06/545,255                   01/22/85
4,495,044                   06/591,089                   01/22/85
4,495,048                   06/379,472                   01/22/85
4,495,056                   06/368,976                   01/22/85
4,495,061                   06/302,014                   01/22/85
4,495,069                   06/463,041                   01/22/85
4,495,073                   06/544,209                   01/22/85
4,495,080                   06/521,014                   01/22/85
4,495,085                   06/582,782                   01/22/85
4,495,089                   06/416,763                   01/22/85
4,495,092                   06/577,433                   01/22/85
4,495,098                   06/504,694                   01/22/85
4,495,100                   06/504,693                   01/22/85
4,495,102                   06/414,717                   01/22/85
4,495,105                   06/473,836                   01/22/85
4,495,106                   06/408,100                   01/22/85
4,495,117                   06/476,385                   01/22/85
4,495,120                   06/319,363                   01/22/85
4,495,130                   06/481,976                   01/22/85
4,495,143                   06/535,462                   01/22/85
4,495,153                   06/374,413                   01/22/85
4,495,158                   06/584,846                   01/22/85
4,495,173                   06/318,878                   01/22/85
4,495,178                   06/539,458                   01/22/85
4,495,182                   06/382,763                   01/22/85
4,495,189                   06/364,753                   01/22/85
4,495,192                   06/490,167                   01/22/85
4,495,194                   06/441,204                   01/22/85
4,495,196                   06/294,327                   01/22/85
4,495,197                   06/380,984                   01/22/85
4,495,204                   06/517,800                   01/22/85
4,495,205                   06/538,591                   01/22/85
4,495,207                   06/436,541                   01/22/85
4,495,211                   06/434,185                   01/22/85
4,495,216                   06/400,884                   01/22/85
4,495,225                   06/591,676                   01/22/85
4,495,226                   06/558,212                   01/22/85
4,495,234                   06/428,612                   01/22/85
4,495,240                   06/600,781                   01/22/85
4,495,249                   06/464,018                   01/22/85
4,495,253                   06/499,748                   01/22/85
4,495,259                   06/465,735                   01/22/85
4,495,262                   06/489,317                   01/22/85
4,495,266                   06/376,057                   01/22/85
4,495,268                   06/393,802                   01/22/85
4,495,277                   06/519,150                   01/22/85
4,495,281                   06/435,633                   01/22/85
4,495,283                   06/482,892                   01/22/85
4,495,284                   06/443,805                   01/22/85
4,495,285                   06/437,009                   01/22/85
4,495,286                   06/497,875                   01/22/85
4,495,288                   06/484,627                   01/22/85
4,495,292                   06/418,852                   01/22/85
4,495,308                   06/579,847                   01/22/85
4,495,314                   06/323,508                   01/22/85
4,495,318                   06/591,948                   01/22/85
4,495,325                   06/469,688                   01/22/85
4,495,333                   06/555,795                   01/22/85
4,495,337                   06/469,528                   01/22/85
4,495,342                   06/535,460                   01/22/85
4,495,343                   06/501,395                   01/22/85
4,495,347                   06/439,446                   01/22/85
4,495,349                   06/512,497                   01/22/85
4,495,362                   06/439,188                   01/22/85
4,495,371                   06/513,800                   01/22/85
4,495,389                   06/387,287                   01/22/85
4,495,390                   06/534,583                   01/22/85
4,495,393                   06/332,978                   01/22/85
4,495,397                   06/310,511                   01/22/85
4,495,399                   06/354,546                   01/22/85
4,495,403                   06/531,426                   01/22/85
4,495,407                   06/362,613                   01/22/85
4,495,408                   06/376,235                   01/22/85
4,495,412                   06/402,509                   01/22/85
4,495,417                   06/435,787                   01/22/85
4,495,426                   06/335,028                   01/22/85
4,495,431                   06/525,185                   01/22/85
4,495,435                   06/402,174                   01/22/85
4,495,436                   06/394,737                   01/22/85
4,495,443                   06/574,479                   01/22/85
4,495,447                   06/266,645                   01/22/85
4,495,451                   06/385,301                   01/22/85
4,495,463                   06/351,763                   01/22/85
4,495,469                   06/442,328                   01/22/85
4,495,472                   06/443,194                   01/22/85
4,495,476                   06/414,365                   01/22/85
4,495,477                   06/372,386                   01/22/85
4,495,478                   06/467,061                   01/22/85
4,495,480                   06/331,595                   01/22/85
4,495,482                   06/504,770                   01/22/85
4,495,487                   06/437,073                   01/22/85
4,495,495                   06/340,017                   01/22/85
4,495,496                   06/330,976                   01/22/85
4,495,503                   06/350,481                   01/22/85
4,495,504                   06/471,552                   01/22/85
4,495,507                   06/459,076                   01/22/85
4,495,512                   06/385,740                   01/22/85
4,495,514                   06/517,568                   01/22/85
4,495,522                   06/395,638                   01/22/85
4,495,523                   06/459,556                   01/22/85
4,495,528                   06/394,942                   01/22/85
4,495,530                   06/324,764                   01/22/85
4,495,534                   06/465,098                   01/22/85
4,495,551                   06/524,097                   01/22/85
4,495,553                   06/513,405                   01/22/85
4,495,554                   06/479,615                   01/22/85
4,495,556                   06/445,389                   01/22/85
4,495,560                   06/281,176                   01/22/85
4,495,563                   06/279,902                   01/22/85
4,495,572                   06/346,856                   01/22/85
4,495,574                   06/391,705                   01/22/85
4,495,580                   06/248,803                   01/22/85
4,495,586                   06/402,872                   01/22/85
4,495,589                   06/419,996                   01/22/85
4,495,605                   06/283,323                   01/22/85
4,495,607                   06/535,143                   01/22/85
4,495,610                   06/416,715                   01/22/85
4,495,618                   06/365,693                   01/22/85
4,495,626                   06/391,813                   01/22/85
4,495,635                   06/533,626                   01/22/85
4,495,640                   06/392,538                   01/22/85
4,495,646                   06/370,084                   01/22/85
4,495,649                   06/454,411                   01/22/85
4,495,653                   06/488,293                   01/22/85
4,495,656                   06/417,506                   01/22/85
4,797,954                   07/104,650                   01/17/89
4,797,956                   07/108,925                   01/17/89
4,797,959                   07/037,558                   01/17/89
4,797,963                   07/182,096                   01/17/89
4,797,966                   07/063,890                   01/17/89
4,797,967                   07/105,406                   01/17/89
4,797,971                   07/007,361                   01/17/89
4,797,977                   07/192,647                   01/17/89
4,797,978                   07/076,019                   01/17/89
4,797,979                   07/070,028                   01/17/89
4,797,984                   07/068,344                   01/17/89
4,797,987                   07/053,276                   01/17/89
4,797,993                   07/074,949                   01/17/89
4,797,995                   06/939,322                   01/17/89
4,798,000                   07/014,589                   01/17/89
4,798,001                   07/115,936                   01/17/89
4,798,004                   07/061,070                   01/17/89
4,798,005                   07/191,713                   01/17/89
4,798,011                   07/128,153                   01/17/89
4,798,013                   06/886,090                   01/17/89
4,798,015                   07/059,874                   01/17/89
4,798,020                   07/005,590                   01/17/89
4,798,025                   07/067,047                   01/17/89
4,798,031                   07/115,990                   01/17/89
4,798,032                   07/158,709                   01/17/89
4,798,036                   07/071,021                   01/17/89
4,798,037                   07/029,369                   01/17/89
4,798,040                   07/030,015                   01/17/89
4,798,041                   07/011,926                   01/17/89
4,798,044                   07/089,282                   01/17/89
4,798,057                   07/022,816                   01/17/89
4,798,059                   07/092,540                   01/17/89
4,798,060                   06/947,030                   01/17/89
4,798,061                   07/168,400                   01/17/89
4,798,065                   07/053,843                   01/17/89
4,798,066                   07/152,636                   01/17/89
4,798,067                   07/079,521                   01/17/89
4,798,071                   07/063,298                   01/17/89
4,798,078                   07/059,703                   01/17/89
4,798,085                   06/403,263                   01/17/89
4,798,088                   07/170,757                   01/17/89
4,798,091                   06/941,352                   01/17/89
4,798,095                   07/039,952                   01/17/89
4,798,096                   07/094,686                   01/17/89
4,798,101                   07/008,255                   01/17/89
4,798,102                   07/052,478                   01/17/89
4,798,106                   06/941,206                   01/17/89
4,798,108                   06/605,467                   01/17/89
4,798,109                   07/100,013                   01/17/89
4,798,110                   06/318,042                   01/17/89
4,798,115                   07/058,469                   01/17/89
4,798,117                   07/117,471                   01/17/89
4,798,124                   07/026,304                   01/17/89
4,798,128                   07/072,860                   01/17/89
4,798,138                   07/142,994                   01/17/89
4,798,140                   07/090,975                   01/17/89
4,798,141                   07/082,777                   01/17/89
4,798,142                   06/908,763                   01/17/89
4,798,146                   06/868,730                   01/17/89
4,798,158                   07/068,813                   01/17/89
4,798,159                   07/147,967                   01/17/89
4,798,162                   07/075,105                   01/17/89
4,798,168                   07/022,714                   01/17/89
4,798,170                   07/053,716                   01/17/89
4,798,176                   07/081,312                   01/17/89
4,798,179                   07/062,889                   01/17/89
4,798,184                   06/931,536                   01/17/89
4,798,188                   07/126,638                   01/17/89
4,798,195                   06/928,539                   01/17/89
4,798,197                   07/024,232                   01/17/89
4,798,207                   06/858,736                   01/17/89
4,798,209                   07/001,980                   01/17/89
4,798,210                   06/913,065                   01/17/89
4,798,212                   06/930,918                   01/17/89
4,798,219                   06/801,575                   01/17/89
4,798,220                   06/870,181                   01/17/89
4,798,226                   07/154,725                   01/17/89
4,798,235                   07/058,281                   01/17/89
4,798,239                   06/568,961                   01/17/89
4,798,241                   06/482,018                   01/17/89
4,798,242                   06/868,530                   01/17/89
4,798,244                   07/074,223                   01/17/89
4,798,246                   07/041,230                   01/17/89
4,798,247                   07/073,762                   01/17/89
4,798,249                   07/105,084                   01/17/89
4,798,261                   06/881,911                   01/17/89
4,798,264                   07/138,651                   01/17/89
4,798,271                   06/893,123                   01/17/89
4,798,274                   06/907,093                   01/17/89
4,798,276                   06/458,680                   01/17/89
4,798,278                   07/076,703                   01/17/89
4,798,280                   06/528,263                   01/17/89
4,798,281                   06/864,092                   01/17/89
4,798,284                   07/058,193                   01/17/89
4,798,287                   07/061,423                   01/17/89
4,798,290                   07/130,900                   01/17/89
4,798,293                   07/188,198                   01/17/89
4,798,299                   06/930,699                   01/17/89
4,798,302                   07/174,205                   01/17/89
4,798,311                   06/865,724                   01/17/89
4,798,312                   07/002,456                   01/17/89
4,798,317                   07/103,388                   01/17/89
4,798,326                   07/146,424                   01/17/89
4,798,327                   06/696,033                   01/17/89
4,798,331                   07/137,716                   01/17/89
4,798,332                   07/191,773                   01/17/89
4,798,338                   06/939,257                   01/17/89
4,798,340                   07/112,840                   01/17/89
4,798,343                   07/102,861                   01/17/89
4,798,349                   07/104,951                   01/17/89
4,798,351                   07/094,229                   01/17/89
4,798,352                   07/118,654                   01/17/89
4,798,353                   07/010,912                   01/17/89
4,798,361                   07/112,881                   01/17/89
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