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 February 5, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 32,774                  07/006,054                   11/01/88
(4,497,504)                (06/494,651)                (02/05/85)
Re. 33,906                  07/006,054                   04/28/92
(4,801,585)                (06/945,038)                (01/31/89)
4,497,069                   06/459,369                   02/05/85
4,497,073                   06/508,866                   02/05/85
4,497,078                   06/466,089                   02/05/85
4,497,089                   06/416,316                   02/05/85
4,497,091                   06/476,429                   02/05/85
4,497,107                   06/531,524                   02/05/85
4,497,114                   06/486,918                   02/05/85
4,497,115                   06/473,687                   02/05/85
4,497,116                   06/483,816                   02/05/85
4,497,119                   06/486,103                   02/05/85
4,497,129                   06/443,879                   02/05/85
4,497,131                   06/328,485                   02/05/85
4,497,136                   06/560,252                   02/05/85
4,497,142                   06/461,589                   02/05/85
4,497,147                   06/425,725                   02/05/85
4,497,150                   06/423,925                   02/05/85
4,497,151                   06/425,477                   02/05/85
4,497,159                   06/344,870                   02/05/85
4,497,160                   06/616,783                   02/05/85
4,497,162                   06/458,871                   02/05/85
4,497,170                   06/400,578                   02/05/85
4,497,180                   06/594,817                   02/05/85
4,497,182                   06/424,523                   02/05/85
4,497,201                   06/460,820                   02/05/85
4,497,215                   06/490,323                   02/05/85
4,497,216                   06/379,510                   02/05/85
4,497,218                   06/382,715                   02/05/85
4,497,220                   06/487,970                   02/05/85
4,497,222                   06/454,570                   02/05/85
4,497,224                   06/522,123                   02/05/85
4,497,228                   06/506,481                   02/05/85
4,497,234                   06/476,980                   02/05/85
4,497,239                   06/308,420                   02/05/85
4,497,240                   06/510,889                   02/05/85
4,497,241                   06/603,752                   02/05/85
4,497,244                   06/459,852                   02/05/85
4,497,247                   06/362,232                   02/05/85
4,497,255                   06/440,427                   02/05/85
4,497,258                   06/429,745                   02/05/85
4,497,263                   06/472,807                   02/05/85
4,497,269                   06/488,043                   02/05/85
4,497,270                   06/535,729                   02/05/85
4,497,276                   06/321,979                   02/05/85
4,497,277                   06/467,998                   02/05/85
4,497,285                   06/416,425                   02/05/85
4,497,288                   06/465,716                   02/05/85
4,497,291                   06/557,224                   02/05/85
4,497,296                   06/437,001                   02/05/85
4,497,298                   06/587,513                   02/05/85
4,497,299                   06/570,556                   02/05/85
4,497,302                   06/471,127                   02/05/85
4,497,306                   06/403,858                   02/05/85
4,497,325                   06/398,623                   02/05/85
4,497,331                   06/407,081                   02/05/85
4,497,333                   06/491,665                   02/05/85
4,497,334                   06/397,454                   02/05/85
4,497,342                   06/505,832                   02/05/85
4,497,346                   06/300,663                   02/05/85
4,497,348                   06/634,044                   02/05/85
4,497,353                   06/300,757                   02/05/85
4,497,354                   06/617,842                   02/05/85
4,497,366                   06/581,339                   02/05/85
4,497,370                   06/407,514                   02/05/85
4,497,371                   06/274,170                   02/05/85
4,497,376                   06/404,367                   02/05/85
4,497,384                   06/336,804                   02/05/85
4,497,390                   06/497,121                   02/05/85
4,497,394                   06/416,023                   02/05/85
4,497,396                   06/419,851                   02/05/85
4,497,397                   06/350,284                   02/05/85
4,497,403                   06/507,445                   02/05/85
4,497,408                   06/445,362                   02/05/85
4,497,412                   06/588,764                   02/05/85
4,497,414                   06/418,973                   02/05/85
4,497,415                   06/576,868                   02/05/85
4,497,426                   06/527,374                   02/05/85
4,497,431                   06/336,675                   02/05/85
4,497,435                   06/549,276                   02/05/85
4,497,437                   06/415,945                   02/05/85
4,497,438                   06/452,533                   02/05/85
4,497,443                   06/415,214                   02/05/85
4,497,445                   06/540,102                   02/05/85
4,497,447                   06/496,830                   02/05/85
4,497,477                   06/318,450                   02/05/85
4,497,491                   06/563,237                   02/05/85
4,497,493                   06/629,813                   02/05/85
4,497,506                   06/461,135                   02/05/85
4,497,508                   06/392,372                   02/05/85
4,497,509                   06/419,547                   02/05/85
4,497,512                   06/533,388                   02/05/85
4,497,517                   06/393,597                   02/05/85
4,497,526                   06/479,248                   02/05/85
4,497,529                   06/443,795                   02/05/85
4,497,531                   06/399,505                   02/05/85
4,497,535                   06/359,736                   02/05/85
4,497,536                   06/497,219                   02/05/85
4,497,539                   06/432,989                   02/05/85
4,497,542                   06/269,141                   02/05/85
4,497,543                   06/269,211                   02/05/85
4,497,545                   06/375,327                   02/05/85
4,497,546                   06/483,278                   02/05/85
4,497,552                   06/458,159                   02/05/85
4,497,554                   06/425,471                   02/05/85
4,497,560                   06/456,789                   02/05/85
4,497,563                   06/435,112                   02/05/85
4,497,571                   06/499,203                   02/05/85
4,497,582                   06/438,043                   02/05/85
4,497,587                   06/505,749                   02/05/85
4,497,588                   06/430,436                   02/05/85
4,497,589                   06/408,428                   02/05/85
4,497,590                   06/356,133                   02/05/85
4,497,600                   06/482,973                   02/05/85
4,497,608                   06/503,661                   02/05/85
4,497,610                   06/467,078                   02/05/85
4,497,613                   06/461,007                   02/05/85
4,497,617                   06/417,786                   02/05/85
4,497,624                   06/4397,60                   02/05/85
4,497,626                   06/5330,08                   02/05/85
4,497,644                   06/530,918                   02/05/85
4,497,652                   06/452,585                   02/05/85
4,497,658                   06/540,441                   02/05/85
4,497,661                   06/557,989                   02/05/85
4,497,663                   06/615,720                   02/05/85
4,497,666                   06/462,088                   02/05/85
4,497,670                   06/463,854                   02/05/85
4,497,671                   06/555,431                   02/05/85
4,497,674                   06/615,528                   02/05/85
4,497,678                   06/555,411                   02/05/85
4,497,688                   06/477,155                   02/05/85
4,497,689                   06/537,324                   02/05/85
4,497,697                   06/585,662                   02/05/85
4,497,699                   06/479,595                   02/05/85
4,497,702                   06/406,605                   02/05/85
4,497,703                   06/479,212                   02/05/85
4,497,708                   06/468,854                   02/05/85
4,497,719                   06/426,526                   02/05/85
4,497,724                   06/490,202                   02/05/85
4,497,726                   06/499,234                   02/05/85
4,497,728                   06/496,300                   02/05/85
4,497,729                   06/322,902                   02/05/85
4,497,731                   06/481,618                   02/05/85
4,497,732                   06/544,183                   02/05/85
4,497,733                   06/417,513                   02/05/85
4,497,734                   06/404,805                   02/05/85
4,497,735                   06/425,829                   02/05/85
4,497,737                   06/355,663                   02/05/85
4,497,742                   06/351,927                   02/05/85
4,497,745                   06/430,061                   02/05/85
4,497,746                   06/422,332                   02/05/85
4,497,748                   06/421,699                   02/05/85
4,497,749                   06/556,802                   02/05/85
4,497,751                   06/398,186                   02/05/85
4,497,752                   06/396,720                   02/05/85
4,497,755                   06/413,264                   02/05/85
4,497,756                   06/308,637                   02/05/85
4,497,759                   06/452,862                   02/05/85
4,497,782                   06/570,853                   02/05/85
4,497,786                   06/517,598                   02/05/85
4,497,793                   06/470,014                   02/05/85
4,497,803                   06/482,553                   02/05/85
4,497,816                   06/519,513                   02/05/85
4,497,819                   06/491,651                   02/05/85
4,497,821                   06/470,883                   02/05/85
4,497,830                   06/381,609                   02/05/85
4,497,832                   06/485,684                   02/05/85
4,497,842                   06/471,820                   02/05/85
4,497,847                   06/540,718                   02/05/85
4,497,855                   06/261,061                   02/05/85
4,497,862                   06/521,147                   02/05/85
4,497,865                   06/425,960                   02/05/85
4,497,870                   06/482,709                   02/05/85
4,497,881                   06/462,264                   02/05/85
4,497,882                   06/577,471                   02/05/85
4,497,886                   06/524,590                   02/05/85
4,497,889                   06/544,036                   02/05/85
4,497,891                   06/545,032                   02/05/85
4,497,894                   06/533,818                   02/05/85
4,497,898                   06/411,196                   02/05/85
4,497,903                   06/451,612                   02/05/85
4,497,905                   06/541,625                   02/05/85
4,497,909                   06/290,629                   02/05/85
4,497,914                   06/398,913                   02/05/85
4,497,915                   06/413,471                   02/05/85
4,497,923                   06/547,904                   02/05/85
4,497,924                   06/485,949                   02/05/85
4,497,925                   06/293,242                   02/05/85
4,497,930                   06/527,134                   02/05/85
4,497,931                   06/509,929                   02/05/85
4,497,933                   06/561,808                   02/05/85
4,497,935                   06/461,788                   02/05/85
4,497,946                   06/484,509                   02/05/85
4,497,947                   06/557,990                   02/05/85
4,497,953                   06/454,936                   02/05/85
4,497,955                   06/422,755                   02/05/85
4,497,957                   06/391,997                   02/05/85
4,497,960                   06/446,944                   02/05/85
4,497,964                   06/441,853                   02/05/85
4,497,967                   06/621,271                   02/05/85
4,497,974                   06/443,197                   02/05/85
4,497,978                   06/504,102                   02/05/85
4,497,981                   06/383,603                   02/05/85
4,497,983                   06/497,381                   02/05/85
4,497,986                   06/533,114                   02/05/85
4,497,990                   06/488,187                   02/05/85
4,497,991                   06/542,581                   02/05/85
4,497,993                   06/513,287                   02/05/85
4,497,997                   06/496,394                   02/05/85
4,497,998                   06/452,606                   02/05/85
4,498,008                   06/483,342                   02/05/85
4,498,009                   06/421,625                   02/05/85
4,498,014                   06/460,675                   02/05/85
4,498,017                   06/487,099                   02/05/85
4,498,022                   06/329,925                   02/05/85
4,498,025                   06/323,488                   02/05/85
4,498,030                   06/441,185                   02/05/85
4,498,031                   06/455,395                   02/05/85
4,498,036                   06/522,979                   02/05/85
4,498,043                   06/391,350                   02/05/85
4,498,047                   06/444,971                   02/05/85
4,498,058                   06/378,556                   02/05/85
4,498,059                   06/507,437                   02/05/85
4,498,066                   06/525,894                   02/05/85
4,498,069                   06/453,553                   02/05/85
4,498,083                   06/480,533                   02/05/85
4,498,090                   06/349,776                   02/05/85
4,498,102                   06/367,387                   02/05/85
4,498,114                   06/417,228                   02/05/85
4,498,130                   06/406,148                   02/05/85
4,498,140                   06/384,223                   02/05/85
4,498,142                   06/311,113                   02/05/85
4,498,160                   06/422,687                   02/05/85
4,498,162                   06/483,698                   02/05/85
4,498,166                   06/440,866                   02/05/85
4,498,174                   06/411,199                   02/05/85
4,498,177                   06/412,487                   02/05/85
4,498,188                   06/491,547                   02/05/85
4,498,198                   06/419,373                   02/05/85
4,800,592                   07/114,434                   01/31/89
4,800,594                   07/127,986                   01/31/89
4,800,595                   06/925,069                   01/31/89
4,800,596                   06/901,261                   01/31/89
4,800,604                   07/166,658                   01/31/89
4,800,612                   07/123,725                   01/31/89
4,800,614                   07/044,797                   01/31/89
4,800,615                   07/035,624                   01/31/89
4,800,619                   07/080,291                   01/31/89
4,800,627                   07/038,933                   01/31/89
4,800,629                   07/136,765                   01/31/89
4,800,630                   07/129,596                   01/31/89
4,800,631                   07/069,161                   01/31/89
4,800,632                   07/143,509                   01/31/89
4,800,633                   07/071,148                   01/31/89
4,800,640                   07/024,556                   01/31/89
4,800,641                   07/103,657                   01/31/89
4,800,651                   06/503,956                   01/31/89
4,800,652                   07/101,205                   01/31/89
4,800,654                   07/108,534                   01/31/89
4,800,655                   07/057,619                   01/31/89
4,800,656                   07/005,841                   01/31/89
4,800,661                   07/050,567                   01/31/89
4,800,667                   07/034,839                   01/31/89
4,800,669                   07/066,310                   01/31/89
4,800,671                   07/132,796                   01/31/89
4,800,674                   06/947,638                   01/31/89
4,800,679                   07/060,198                   01/31/89
4,800,681                   07/018,551                   01/31/89
4,800,684                   07/204,971                   01/31/89
4,800,688                   07/063,259                   01/31/89
4,800,691                   07/002,653                   01/31/89
4,800,693                   07/180,678                   01/31/89
4,800,704                   07/133,144                   01/31/89
4,800,707                   07/135,175                   01/31/89
4,800,709                   06/906,823                   01/31/89
4,800,714                   07/052,833                   01/31/89
4,800,722                   07/187,278                   01/31/89
4,800,724                   06/946,866                   01/31/89
4,800,728                   07/099,443                   01/31/89
4,800,737                   07/039,544                   01/31/89
4,800,744                   07/073,689                   01/31/89
4,800,749                   06/896,992                   01/31/89
4,800,751                   07/056,761                   01/31/89
4,800,757                   06/928,907                   01/31/89
4,800,763                   07/147,780                   01/31/89
4,800,769                   07/052,511                   01/31/89
4,800,771                   07/026,292                   01/31/89
4,800,773                   06/907,867                   01/31/89
4,800,776                   06/468,151                   01/31/89
4,800,779                   07/127,585                   01/31/89
4,800,786                   07/049,028                   01/31/89
4,800,788                   07/111,110                   01/31/89
4,800,790                   06/930,614                   01/31/89
4,800,792                   07/033,857                   01/31/89
4,800,796                   07/021,773                   01/31/89
4,800,812                   06/904,162                   01/31/89
4,800,813                   07/065,847                   01/31/89
4,800,814                   06/882,917                   01/31/89
4,800,816                   07/102,320                   01/31/89
4,800,820                   06/937,033                   01/31/89
4,800,822                   06/917,050                   01/31/89
4,800,824                   07/107,099                   01/31/89
4,800,831                   06/912,966                   01/31/89
4,800,833                   06/923,739                   01/31/89
4,800,843                   07/057,768                   01/31/89
4,800,846                   07/203,221                   01/31/89
4,800,865                   07/158,947                   01/31/89
4,800,868                   06/564,351                   01/31/89
4,800,870                   07/166,923                   01/31/89
4,800,873                   07/091,110                   01/31/89
4,800,874                   07/073,575                   01/31/89
4,800,877                   06/866,601                   01/31/89
4,800,881                   07/076,168                   01/31/89
4,800,887                   06/900,661                   01/31/89
4,800,893                   07/061,156                   01/31/89
4,800,902                   07/037,706                   01/31/89
4,800,904                   07/003,356                   01/31/89
4,800,906                   06/891,608                   01/31/89
4,800,911                   07/034,630                   01/31/89
4,800,913                   07/209,065                   01/31/89
4,800,914                   07/132,396                   01/31/89
4,800,919                   07/063,414                   01/31/89
4,800,927                   06/919,681                   01/31/89
4,800,931                   07/007,948                   01/31/89
4,800,934                   07/142,704                   01/31/89
4,800,936                   07/123,723                   01/31/89
4,800,945                   07/023,048                   01/31/89
4,800,951                   07/089,563                   01/31/89
4,800,952                   07/076,465                   01/31/89
4,800,955                   07/106,237                   01/31/89
4,800,961                   07/016,027                   01/31/89
4,800,967                   07/082,032                   01/31/89
4,800,968                   07/099,771                   01/31/89
4,800,977                   07/088,598                   01/31/89
4,800,982                   07/108,122                   01/31/89
4,800,983                   07/002,812                   01/31/89
4,800,985                   06/830,561                   01/31/89
4,800,986                   07/162,543                   01/31/89
4,800,987                   07/165,978                   01/31/89
4,800,990                   07/048,101                   01/31/89
4,800,991                   07/086,968                   01/31/89
4,800,992                   06/918,536                   01/31/89
4,800,995                   07/110,404                   01/31/89
4,800,999                   07/049,404                   01/31/89
4,801,001                   07/060,805                   01/31/89
4,801,002                   07/014,863                   01/31/89
4,801,004                   07/062,640                   01/31/89
4,801,008                   07/212,165                   01/31/89
4,801,010                   07/068,546                   01/31/89
4,801,015                   07/068,751                   01/31/89
4,801,016                   07/195,480                   01/31/89
4,801,019                   06/930,698                   01/31/89
4,801,020                   07/040,604                   01/31/89
4,801,021                   07/108,230                   01/31/89
4,801,028                   06/914,878                   01/31/89
4,801,032                   07/088,808                   01/31/89
4,801,034                   07/108,940                   01/31/89
4,801,036                   07/148,484                   01/31/89
4,801,038                   07/158,479                   01/31/89
4,801,045                   06/947,287                   01/31/89
4,801,055                   06/890,481                   01/31/89
4,801,059                   07/121,121                   01/31/89
4,801,060                   07/125,867                   01/31/89
4,801,070                   07/048,239                   01/31/89
4,801,073                   07/127,526                   01/31/89
4,801,080                   06/932,335                   01/31/89
4,801,082                   07/178,365                   01/31/89
4,801,083                   07/023,047                   01/31/89
4,801,089                   07/037,932                   01/31/89
4,801,099                   06/647,412                   01/31/89
4,801,101                   07/083,268                   01/31/89
4,801,102                   07/112,177                   01/31/89
4,801,103                   07/011,220                   01/31/89
4,801,106                   07/074,030                   01/31/89
4,801,108                   07/137,481                   01/31/89
4,801,117                   07/147,717                   01/31/89
4,801,119                   07/197,309                   01/31/89
4,801,123                   07/039,097                   01/31/89
4,801,127                   07/028,862                   01/31/89
4,801,129                   07/005,186                   01/31/89
4,801,137                   07/113,073                   01/31/89
4,801,138                   07/127,113                   01/31/89
4,801,153                   07/040,072                   01/31/89
4,801,169                   07/172,319                   01/31/89
4,801,176                   07/084,393                   01/31/89
4,801,179                   07/081,257                   01/31/89
4,801,197                   07/154,201                   01/31/89
4,801,199                   07/082,381                   01/31/89
4,801,200                   07/030,629                   01/31/89
4,801,204                   06/754,212                   01/31/89
4,801,209                   07/045,336                   01/31/89
4,801,217                   06/934,347                   01/31/89
4,801,227                   07/107,702                   01/31/89
4,801,229                   07/078,156                   01/31/89
4,801,240                   07/017,048                   01/31/89
4,801,246                   07/083,979                   01/31/89
4,801,250                   06/856,645                   01/31/89
4,801,257                   07/133,431                   01/31/89
4,801,265                   07/089,948                   01/31/89
4,801,267                   07/057,900                   01/31/89
4,801,274                   07/144,286                   01/31/89
4,801,283                   07/133,746                   01/31/89
4,801,285                   07/018,913                   01/31/89
4,801,288                   07/097,128                   01/31/89
4,801,295                   07/112,538                   01/31/89
4,801,298                   06/936,088                   01/31/89
4,801,300                   07/137,392                   01/31/89
4,801,303                   07/057,068                   01/31/89
4,801,307                   06/775,206                   01/31/89
4,801,312                   07/155,039                   01/31/89
4,801,315                   06/937,545                   01/31/89
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