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 12, 1997
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33359                   07/399,602                   10/02/90
Re. 33588                   07/508,487                   05/14/91
Re. 34006                   07/640,264                   07/28/92
Re. 34269                   07/837,573                   06/01/93
4,498,201                   06/414,300                   02/12/85
4,498,202                   06/469,246                   02/12/85
4,498,204                   06/534,157                   02/12/85
4,498,205                   06/445,781                   02/12/85
4,498,206                   06/487,230                   02/12/85
4,498,208                   06/498,632                   02/12/85
4,498,217                   06/390,320                   02/12/85
4,498,223                   06/371,326                   02/12/85
4,498,225                   06/522,768                   02/12/85
4,498,228                   06/550,847                   02/12/85
4,498,242                   06/536,396                   02/12/85
4,498,252                   06/431,155                   02/12/85
4,498,256                   06/292,913                   02/12/85
4,498,257                   06/496,909                   02/12/85
4,498,268                   06/235,502                   02/12/85
4,498,282                   06/450,298                   02/12/85
4,498,284                   06/381,892                   02/12/85
4,498,285                   06/502,837                   02/12/85
4,498,286                   06/502,838                   02/12/85
4,498,288                   06/465,295                   02/12/85
4,498,293                   06/479,795                   02/12/85
4,498,299                   06/526,668                   02/12/85
4,498,301                   06/466,935                   02/12/85
4,498,302                   06/442,382                   02/12/85
4,498,306                   06/440,403                   02/12/85
4,498,308                   06/430,699                   02/12/85
4,498,311                   06/472,497                   02/12/85
4,498,312                   06/554,525                   02/12/85
4,498,313                   06/565,606                   02/12/85
4,498,316                   06/535,078                   02/12/85
4,498,321                   06/512,126                   02/12/85
4,498,334                   06/433,119                   02/12/85
4,498,338                   06/461,033                   02/12/85
4,498,340                   06/483,078                   02/12/85
4,498,342                   06/486,144                   02/12/85
4,498,347                   06/481,012                   02/12/85
4,498,352                   06/385,393                   02/12/85
4,498,357                   06/421,612                   02/12/85
4,498,360                   06/532,194                   02/12/85
4,498,363                   06/466,364                   02/12/85
4,498,370                   06/351,180                   02/12/85
4,498,375                   06/585,259                   02/12/85
4,498,383                   06/406,494                   02/12/85
4,498,395                   06/511,510                   02/12/85
4,498,396                   06/357,288                   02/12/85
4,498,399                   06/324,598                   02/12/85
4,498,400                   06/429,744                   02/12/85
4,498,405                   06/464,741                   02/12/85
4,498,410                   06/402,649                   02/12/85
4,498,413                   06/475,768                   02/12/85
4,498,426                   06/461,065                   02/12/85
4,498,429                   06/414,858                   02/12/85
4,498,433                   06/505,724                   02/12/85
4,498,436                   06/490,227                   02/12/85
4,498,440                   06/595,867                   02/12/85
4,498,446                   06/508,821                   02/12/85
4,498,454                   06/225,004                   02/12/85
4,498,457                   06/487,619                   02/12/85
4,498,477                   06/364,205                   02/12/85
4,498,478                   06/417,256                   02/12/85
4,498,480                   06/510,261                   02/12/85
4,498,483                   06/572,925                   02/12/85
4,498,489                   06/548,020                   02/12/85
4,498,494                   06/480,176                   02/12/85
4,498,495                   06/289,866                   02/12/85
4,498,496                   06/399,150                   02/12/85
4,498,497                   06/398,878                   02/12/85
4,498,502                   06/551,926                   02/12/85
4,498,505                   06/506,556                   02/12/85
4,498,513                   06/565,885                   02/12/85
4,498,516                   06/580,104                   02/12/85
4,498,517                   06/466,499                   02/12/85
4,498,519                   06/491,381                   02/12/85
4,498,522                   06/392,762                   02/12/85
4,498,523                   06/494,071                   02/12/85
4,498,527                   06/314,967                   02/12/85
4,498,530                   06/289,025                   02/12/85
4,498,535                   06/445,672                   02/12/85
4,498,541                   06/590,680                   02/12/85
4,498,542                   06/489,829                   02/12/85
4,498,546                   06/470,685                   02/12/85
4,498,547                   06/564,503                   02/12/85
4,498,550                   06/497,149                   02/12/85
4,498,551                   06/427,839                   02/12/85
4,498,557                   06/506,106                   02/12/85
4,498,561                   06/387,733                   02/12/85
4,498,563                   06/410,517                   02/12/85
4,498,569                   06/398,196                   02/12/85
4,498,570                   06/343,905                   02/12/85
4,498,578                   06/346,216                   02/12/85
4,498,580                   06/457,789                   02/12/85
4,498,584                   06/402,111                   02/12/85
4,498,590                   06/478,755                   02/12/85
4,498,597                   06/572,403                   02/12/85
4,498,607                   06/438,330                   02/12/85
4,498,613                   06/540,310                   02/12/85
4,498,616                   06/553,591                   02/12/85
4,498,625                   06/508,398                   02/12/85
4,498,629                   06/477,994                   02/12/85
4,498,634                   06/528,677                   02/12/85
4,498,640                   06/375,155                   02/12/85
4,498,644                   06/442,899                   02/12/85
4,498,646                   06/356,418                   02/12/85
4,498,649                   06/449,001                   02/12/85
4,498,655                   06/291,491                   02/12/85
4,498,660                   06/555,766                   02/12/85
4,498,664                   06/360,212                   02/12/85
4,498,673                   06/581,804                   02/12/85
4,498,685                   06/331,928                   02/12/85
4,498,688                   06/360,898                   02/12/85
4,498,690                   06/396,804                   02/12/85
4,498,695                   06/298,481                   02/12/85
4,498,698                   06/485,595                   02/12/85
4,498,700                   06/455,516                   02/12/85
4,498,702                   06/387,415                   02/12/85
4,498,711                   06/439,434                   02/12/85
4,498,716                   06/364,231                   02/12/85
4,498,717                   06/527,636                   02/12/85
4,498,720                   06/496,847                   02/12/85
4,498,721                   06/523,504                   02/12/85
4,498,722                   06/557,977                   02/12/85
4,498,724                   06/587,309                   02/12/85
4,498,727                   06/241,267                   02/12/85
4,498,730                   06/256,617                   02/12/85
4,498,734                   06/417,709                   02/12/85
4,498,737                   06/352,816                   02/12/85
4,498,739                   06/381,800                   02/12/85
4,498,740                   06/485,828                   02/12/85
4,498,743                   06/443,489                   02/12/85
4,498,746                   06/540,029                   02/12/85
4,498,749                   06/481,455                   02/12/85
4,498,757                   06/409,023                   02/12/85
4,498,760                   06/469,571                   02/12/85
4,498,761                   06/527,774                   02/12/85
4,498,765                   06/391,380                   02/12/85
4,498,769                   06/367,879                   02/12/85
4,498,770                   06/350,339                   02/12/85
4,498,777                   06/347,294                   02/12/85
4,498,780                   06/345,052                   02/12/85
4,498,782                   06/268,167                   02/12/85
4,498,791                   06/479,548                   02/12/85
4,498,792                   06/367,003                   02/12/85
4,498,796                   06/476,348                   02/12/85
4,498,800                   06/449,173                   02/12/85
4,498,802                   06/537,264                   02/12/85
4,498,804                   06/459,095                   02/12/85
4,498,808                   06/479,416                   02/12/85
4,498,816                   06/526,259                   02/12/85
4,498,820                   06/409,012                   02/12/85
4,498,827                   06/500,341                   02/12/85
4,498,828                   06/543,791                   02/12/85
4,498,831                   06/489,227                   02/12/85
4,498,835                   06/470,719                   02/12/85
4,498,840                   06/581,214                   02/12/85
4,498,841                   06/458,806                   02/12/85
4,498,843                   06/404,645                   02/12/85
4,498,850                   06/256,522                   02/12/85
4,498,855                   06/555,510                   02/12/85
4,498,858                   06/410,195                   02/12/85
4,498,870                   06/434,260                   02/12/85
4,498,877                   06/338,625                   02/12/85
4,498,880                   06/455,538                   02/12/85
4,498,882                   06/473,221                   02/12/85
4,498,884                   06/347,765                   02/12/85
4,498,892                   06/475,006                   02/12/85
4,498,902                   06/469,096                   02/12/85
4,498,906                   06/368,921                   02/12/85
4,498,911                   06/508,778                   02/12/85
4,498,921                   06/537,199                   02/12/85
4,498,931                   06/509,808                   02/12/85
4,498,932                   06/561,497                   02/12/85
4,498,933                   06/589,953                   02/12/85
4,498,934                   06/408,365                   02/12/85
4,498,937                   06/489,348                   02/12/85
4,498,948                   06/525,858                   02/12/85
4,498,952                   06/419,499                   02/12/85
4,498,955                   06/528,483                   02/12/85
4,498,965                   06/312,355                   02/12/85
4,498,967                   06/535,269                   02/12/85
4,498,970                   06/383,145                   02/12/85
4,498,973                   06/505,559                   02/12/85
4,498,975                   06/569,239                   02/12/85
4,498,982                   06/439,680                   02/12/85
4,498,985                   06/513,436                   02/12/85
4,498,991                   06/622,031                   02/12/85
4,498,992                   06/578,427                   02/12/85
4,498,995                   06/510,413                   02/12/85
4,499,013                   06/524,003                   02/12/85
4,499,014                   06/577,908                   02/12/85
4,499,015                   06/405,969                   02/12/85
4,499,016                   06/290,648                   02/12/85
4,499,021                   06/599,374                   02/12/85
4,499,023                   06/493,869                   02/12/85
4,499,029                   06/504,702                   02/12/85
4,499,030                   06/571,074                   02/12/85
4,499,031                   06/423,536                   02/12/85
4,499,034                   06/414,193                   02/12/85
4,499,038                   06/549,040                   02/12/85
4,499,041                   06/497,312                   02/12/85
4,499,046                   06/321,513                   02/12/85
4,499,054                   06/411,019                   02/12/85
4,499,066                   06/403,475                   02/12/85
4,499,074                   06/527,361                   02/12/85
4,499,078                   06/487,899                   02/12/85
4,499,079                   06/442,681                   02/12/85
4,499,083                   06/298,844                   02/12/85
4,499,086                   06/467,828                   02/12/85
4,499,087                   06/554,097                   02/12/85
4,499,090                   06/539,285                   02/12/85
4,499,091                   06/466,095                   02/12/85
4,499,092                   06/435,230                   02/12/85
4,499,095                   06/501,856                   02/12/85
4,499,102                   06/329,296                   02/12/85
4,499,112                   06/477,234                   02/12/85
4,499,116                   06/556,479                   02/12/85
4,499,118                   06/553,657                   02/12/85
4,499,119                   06/511,354                   02/12/85
4,499,133                   06/492,680                   02/12/85
4,499,139                   06/585,696                   02/12/85
4,499,144                   06/457,523                   02/12/85
4,499,145                   06/480,034                   02/12/85
4,499,146                   06/555,401                   02/12/85
4,499,147                   06/451,940                   02/12/85
4,499,153                   06/466,708                   02/12/85
4,499,155                   06/452,675                   02/12/85
4,499,159                   06/600,066                   02/12/85
4,499,165                   06/473,825                   02/12/85
4,499,166                   06/273,283                   02/12/85
4,499,170                   06/505,231                   02/12/85
4,499,174                   06/592,766                   02/12/85
4,499,176                   06/421,271                   02/12/85
4,499,184                   06/383,849                   02/12/85
4,499,191                   06/375,201                   02/12/85
4,499,192                   06/444,119                   02/12/85
4,499,193                   06/450,336                   02/12/85
4,499,196                   06/482,778                   02/12/85
4,499,202                   06/393,500                   02/12/85
4,499,208                   06/494,547                   02/12/85
4,499,210                   06/561,658                   02/12/85
4,499,211                   06/402,266                   02/12/85
4,499,212                   06/575,224                   02/12/85
4,499,214                   06/491,070                   02/12/85
4,499,217                   06/343,920                   02/12/85
4,499,222                   06/523,640                   02/12/85
4,499,228                   06/507,303                   02/12/85
4,499,235                   06/534,244                   02/12/85
4,499,236                   06/562,218                   02/12/85
4,499,238                   06/464,500                   02/12/85
4,499,248                   06/493,892                   02/12/85
4,499,249                   06/489,289                   02/12/85
4,499,252                   06/594,063                   02/12/85
4,499,253                   06/514,765                   02/12/85
4,499,256                   06/438,730                   02/12/85
4,499,257                   06/485,946                   02/12/85
4,499,262                   06/588,168                   02/12/85
4,499,278                   06/443,701                   02/12/85
4,499,281                   06/352,689                   02/12/85
4,499,285                   06/437,937                   02/12/85
4,499,287                   06/403,194                   02/12/85
4,499,289                   06/549,534                   02/12/85
4,499,291                   06/517,589                   02/12/85
4,499,292                   06/494,233                   02/12/85
4,499,297                   06/552,462                   02/12/85
4,499,301                   06/378,294                   02/12/85
4,499,304                   06/386,457                   02/12/85
4,499,305                   06/483,664                   02/12/85
4,499,312                   06/582,082                   02/12/85
4,499,323                   06/600,665                   02/12/85
4,499,324                   06/600,917                   02/12/85
4,499,326                   06/422,822                   02/12/85
4,499,329                   06/515,972                   02/12/85
4,499,330                   06/564,668                   02/12/85
4,499,336                   06/437,646                   02/12/85
4,499,341                   06/421,704                   02/12/85
4,499,344                   06/483,995                   02/12/85
4,499,346                   06/515,371                   02/12/85
4,499,347                   06/543,079                   02/12/85
4,499,352                   06/436,888                   02/12/85
4,499,355                   06/589,857                   02/12/85
4,499,356                   06/481,878                   02/12/85
4,499,369                   06/496,635                   02/12/85
4,499,373                   06/383,574                   02/12/85
4,499,375                   06/376,775                   02/12/85
4,499,378                   06/473,344                   02/12/85
4,499,379                   06/473,345                   02/12/85
4,499,384                   06/269,863                   02/12/85
4,499,391                   06/416,933                   02/12/85
4,499,392                   06/514,610                   02/12/85
4,499,396                   06/409,280                   02/12/85
4,499,402                   06/370,428                   02/12/85
4,499,410                   06/505,300                   02/12/85
4,499,414                   06/438,692                   02/12/85
4,499,419                   06/273,536                   02/12/85
4,499,440                   06/525,204                   02/12/85
4,499,445                   06/610,783                   02/12/85
4,499,464                   06/350,399                   02/12/85
4,499,466                   06/394,243                   02/12/85
4,499,470                   06/375,620                   02/12/85
4,499,474                   06/363,264                   02/12/85
4,499,476                   06/372,355                   02/12/85
4,499,479                   06/413,039                   02/12/85
4,499,492                   06/464,600                   02/12/85
4,499,499                   06/454,230                   02/12/85
4,499,514                   06/362,614                   02/12/85
4,499,515                   06/398,419                   02/12/85
4,499,516                   06/346,557                   02/12/85
4,499,521                   06/562,324                   02/12/85
4,499,522                   06/393,767                   02/12/85
4,499,523                   06/480,427                   02/12/85
4,499,530                   06/424,369                   02/12/85
4,499,533                   06/471,525                   02/12/85
4,499,539                   06/450,894                   02/12/85
4,499,541                   06/364,401                   02/12/85
4,499,546                   06/376,983                   02/12/85
4,499,549                   06/392,374                   02/12/85
4,499,550                   06/430,390                   02/12/85
4,499,563                   06/361,704                   02/12/85
4,499,568                   06/449,199                   02/12/85
4,499,570                   06/338,716                   02/12/85
4,499,572                   06/402,075                   02/12/85
4,499,575                   06/420,210                   02/12/85
4,499,580                   06/398,150                   02/12/85
4,499,585                   06/434,415                   02/12/85
4,499,586                   06/470,830                   02/12/85
4,499,595                   06/307,541                   02/12/85
4,499,596                   06/392,839                   02/12/85
4,499,598                   06/394,674                   02/12/85
4,802,243                   07/112,556                   02/07/89
4,802,246                   07/018,495                   02/07/89
4,802,256                   07/094,140                   02/07/89
4,802,259                   07/028,216                   02/07/89
4,802,261                   06/918,135                   02/07/89
4,802,262                   07/083,462                   02/07/89
4,802,272                   07/109,452                   02/07/89
4,802,273                   07/033,100                   02/07/89
4,802,280                   07/151,158                   02/07/89
4,802,281                   07/205,599                   02/07/89
4,802,283                   07/048,835                   02/07/89
4,802,289                   07/029,816                   02/07/89
4,802,291                   07/075,717                   02/07/89
4,802,296                   06/947,688                   02/07/89
4,802,298                   07/179,635                   02/07/89
4,802,305                   06/867,595                   02/07/89
4,802,309                   07/082,292                   02/07/89
4,802,310                   07/147,539                   02/07/89
4,802,311                   06/924,855                   02/07/89
4,802,316                   07/078,853                   02/07/89
4,802,319                   07/086,606                   02/07/89
4,802,326                   07/108,732                   02/07/89
4,802,331                   07/098,914                   02/07/89
4,802,332                   07/123,296                   02/07/89
4,802,335                   07/128,387                   02/07/89
4,802,338                   07/155,764                   02/07/89
4,802,341                   06/695,484                   02/07/89
4,802,342                   07/182,655                   02/07/89
4,802,343                   07/068,876                   02/07/89
4,802,356                   07/082,360                   02/07/89
4,802,357                   07/054,893                   02/07/89
4,802,359                   07/112,905                   02/07/89
4,802,362                   06/914,466                   02/07/89
4,802,366                   07/199,026                   02/07/89
4,802,367                   07/147,070                   02/07/89
4,802,371                   07/118,048                   02/07/89
4,802,374                   07/006,689                   02/07/89
4,802,378                   07/063,642                   02/07/89
4,802,381                   07/027,358                   02/07/89
4,802,383                   07/053,061                   02/07/89
4,802,384                   07/103,481                   02/07/89
4,802,386                   07/016,174                   02/07/89
4,802,387                   06/934,102                   02/07/89
4,802,388                   06/757,257                   02/07/89
4,802,390                   07/028,188                   02/07/89
4,802,404                   07/034,858                   02/07/89
4,802,407                   07/055,782                   02/07/89
4,802,410                   07/058,272                   02/07/89
4,802,411                   07/011,568                   02/07/89
4,802,414                   07/116,023                   02/07/89
4,802,415                   07/138,259                   02/07/89
4,802,417                   07/073,016                   02/07/89
4,802,421                   07/093,498                   02/07/89
4,802,424                   07/199,276                   02/07/89
4,802,426                   07/185,841                   02/07/89
4,802,427                   07/155,876                   02/07/89
4,802,433                   07/090,951                   02/07/89
4,802,435                   07/138,951                   02/07/89
4,802,437                   06/925,957                   02/07/89
4,802,448                   07/156,607                   02/07/89
4,802,455                   06/918,123                   02/07/89
4,802,459                   07/135,932                   02/07/89
4,802,461                   07/089,579                   02/07/89
4,802,462                   07/136,017                   02/07/89
4,802,463                   07/112,952                   02/07/89
4,802,469                   07/080,985                   02/07/89
4,802,475                   07/064,619                   02/07/89
4,802,476                   07/056,434                   02/07/89
4,802,477                   07/047,869                   02/07/89
4,802,485                   07/092,055                   02/07/89
4,802,489                   07/076,785                   02/07/89
4,802,492                   07/024,684                   02/07/89
4,802,493                   07/016,487                   02/07/89
4,802,494                   06/914,270                   02/07/89
4,802,495                   06/733,989                   02/07/89
4,802,497                   07/136,938                   02/07/89
4,802,501                   07/076,056                   02/07/89
4,802,502                   07/016,854                   02/07/89
4,802,509                   07/133,074                   02/07/89
4,802,519                   07/059,573                   02/07/89
4,802,523                   06/513,372                   02/07/89
4,802,532                   07/027,321                   02/07/89
4,802,538                   06/832,102                   02/07/89
4,802,541                   07/166,859                   02/07/89
4,802,543                   07/041,225                   02/07/89
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