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 December 4, 1996
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,880                  07/505,347                   04/14/92
(4,788,058)                (07/098,880)                (11/29/88)
4,485,495                   06/435,056                   12/04/84
4,485,500                   06/456,032                   12/04/84
4,485,502                   06/420,279                   12/04/84
4,485,509                   06/521,882                   12/04/84
4,485,511                   06/407,085                   12/04/84
4,485,515                   06/375,133                   12/04/84
4,485,529                   06/504,942                   12/04/84
4,485,533                   06/452,286                   12/04/84
4,485,539                   06/328,076                   12/04/84
4,485,541                   06/363,445                   12/04/84
4,485,542                   06/449,352                   12/04/84
4,485,544                   06/350,034                   12/04/84
4,485,552                   06/399,927                   12/04/84
4,485,554                   06/497,153                   12/04/84
4,485,556                   06/372,361                   12/04/84
4,485,563                   06/446,629                   12/04/84
4,485,566                   06/325,421                   12/04/84
4,485,569                   06/492,335                   12/04/84
4,485,570                   06/501,029                   12/04/84
4,485,577                   06/394,549                   12/04/84
4,485,584                   06/522,698                   12/04/84
4,485,585                   06/374,057                   12/04/84
4,485,595                   06/501,244                   12/04/84
4,485,605                   06/232,195                   12/04/84
4,485,610                   06/457,371                   12/04/84
4,485,612                   06/333,560                   12/04/84
4,485,618                   06/442,146                   12/04/84
4,485,619                   06/416,277                   12/04/84
4,485,628                   06/447,267                   12/04/84
4,485,635                   06/451,941                   12/04/84
4,485,637                   06/528,632                   12/04/84
4,485,639                   06/467,881                   12/04/84
4,485,640                   06/481,272                   12/04/84
4,485,663                   06/560,280                   12/04/84
4,485,678                   06/423,503                   12/04/84
4,485,681                   06/433,108                   12/04/84
4,485,682                   06/424,999                   12/04/84
4,485,685                   06/368,992                   12/04/84
4,485,690                   06/447,522                   12/04/84
4,485,694                   06/316,778                   12/04/84
4,485,700                   06/461,242                   12/04/84
4,485,709                   06/380,205                   12/04/84
4,485,716                   06/498,780                   12/04/84
4,485,718                   06/435,513                   12/04/84
4,485,719                   06/366,457                   12/04/84
4,485,720                   06/381,603                   12/04/84
4,485,728                   06/433,145                   12/04/84
4,485,733                   06/466,885                   12/04/84
4,485,742                   06/271,083                   12/04/84
4,485,746                   06/553,358                   12/04/84
4,485,747                   06/514,192                   12/04/84
4,485,749                   06/391,701                   12/04/84
4,485,750                   06/515,018                   12/04/84
4,485,753                   06/395,740                   12/04/84
4,485,756                   06/497,001                   12/04/84
4,485,758                   06/500,067                   12/04/84
4,485,766                   06/594,928                   12/04/84
4,485,768                   06/530,485                   12/04/84
4,485,769                   06/334,963                   12/04/84
4,485,773                   06/495,595                   12/04/84
4,485,775                   06/495,591                   12/04/84
4,485,783                   06/440,959                   12/04/84
4,485,784                   06/393,321                   12/04/84
4,485,785                   06/379,705                   12/04/84
4,485,788                   06/541,255                   12/04/84
4,485,829                   06/464,484                   12/04/84
4,485,830                   06/299,212                   12/04/84
4,485,836                   06/249,015                   12/04/84
4,485,839                   06/459,854                   12/04/84
4,485,840                   06/373,872                   12/04/84
4,485,842                   06/466,668                   12/04/84
4,485,846                   06/352,023                   12/04/84
4,485,854                   06/524,392                   12/04/84
4,485,865                   06/354,744                   12/04/84
4,485,868                   06/428,081                   12/04/84
4,485,869                   06/435,979                   12/04/84
4,485,871                   06/473,510                   12/04/84
4,485,874                   06/542,249                   12/04/84
4,485,875                   06/470,751                   12/04/84
4,485,878                   06/431,023                   12/04/84
4,485,880                   06/519,296                   12/04/84
4,485,881                   06/530,556                   12/04/84
4,485,884                   06/414,727                   12/04/84
4,485,891                   06/305,602                   12/04/84
4,485,893                   06/466,635                   12/04/84
4,485,895                   06/509,117                   12/04/84
4,485,896                   06/406,986                   12/04/84
4,485,899                   06/403,051                   12/04/84
4,485,905                   06/384,663                   12/04/84
4,485,908                   06/386,567                   12/04/84
4,485,914                   06/429,911                   12/04/84
4,485,925                   06/241,475                   12/04/84
4,485,936                   06/484,376                   12/04/84
4,485,940                   06/516,138                   12/04/84
4,485,954                   06/384,117                   12/04/84
4,485,958                   06/478,691                   12/04/84
4,485,964                   06/484,151                   12/04/84
4,485,979                   06/422,990                   12/04/84
4,485,987                   06/538,262                   12/04/84
4,485,993                   06/544,785                   12/04/84
4,485,994                   06/216,702                   12/04/84
4,486,000                   06/431,924                   12/04/84
4,486,002                   06/423,383                   12/04/84
4,486,003                   06/568,866                   12/04/84
4,486,008                   06/504,052                   12/04/84
4,486,013                   06/409,235                   12/04/84
4,486,014                   06/384,756                   12/04/84
4,486,018                   06/474,516                   12/04/84
4,486,024                   06/495,551                   12/04/84
4,486,025                   06/586,318                   12/04/84
4,486,026                   06/463,572                   12/04/84
4,486,029                   06/512,038                   12/04/84
4,486,034                   06/411,990                   12/04/84
4,486,035                   06/428,051                   12/04/84
4,486,036                   06/428,053                   12/04/84
4,486,039                   06/393,445                   12/04/84
4,486,049                   06/412,927                   12/04/84
4,486,054                   06/518,293                   12/04/84
4,486,066                   06/367,159                   12/04/84
4,486,067                   06/439,882                   12/04/84
4,486,089                   06/401,859                   12/04/84
4,486,091                   06/516,810                   12/04/84
4,486,093                   06/491,438                   12/04/84
4,486,094                   06/420,332                   12/04/84
4,486,099                   06/532,162                   12/04/84
4,486,102                   06/477,963                   12/04/84
4,486,103                   06/421,248                   12/04/84
4,486,107                   06/422,924                   12/04/84
4,486,109                   06/350,198                   12/04/84
4,486,111                   06/426,714                   12/04/84
4,486,112                   06/354,537                   12/04/84
4,486,118                   06/513,928                   12/04/84
4,486,119                   06/404,299                   12/04/84
4,486,123                   06/419,697                   12/04/84
4,486,124                   06/541,203                   12/04/84
4,486,126                   06/387,435                   12/04/84
4,486,128                   06/331,078                   12/04/84
4,486,138                   06/411,965                   12/04/84
4,486,139                   06/412,028                   12/04/84
4,486,140                   06/437,020                   12/04/84
4,486,141                   06/383,592                   12/04/84
4,486,148                   06/379,021                   12/04/84
4,486,150                   06/368,490                   12/04/84
4,486,161                   06/494,073                   12/04/84
4,486,164                   06/433,770                   12/04/84
4,486,166                   06/407,677                   12/04/84
4,486,173                   06/461,186                   12/04/84
4,486,177                   06/423,019                   12/04/84
4,486,180                   06/372,114                   12/04/84
4,486,189                   06/423,376                   12/04/84
4,486,196                   06/571,059                   12/04/84
4,486,199                   06/531,791                   12/04/84
4,486,202                   06/509,613                   12/04/84
4,486,205                   06/580,363                   12/04/84
4,486,206                   06/511,007                   12/04/84
4,486,211                   06/457,907                   12/04/84
4,486,217                   06/379,083                   12/04/84
4,486,218                   06/294,603                   12/04/84
4,486,219                   06/487,326                   12/04/84
4,486,226                   06/556,492                   12/04/84
4,486,228                   06/573,115                   12/04/84
4,486,230                   06/533,897                   12/04/84
4,486,233                   06/518,431                   12/04/84
4,486,242                   06/479,256                   12/04/84
4,486,244                   06/451,108                   12/04/84
4,486,245                   06/258,558                   12/04/84
4,486,252                   06/299,428                   12/04/84
4,486,253                   06/391,907                   12/04/84
4,486,258                   06/466,860                   12/04/84
4,486,262                   06/433,814                   12/04/84
4,486,265                   06/396,128                   12/04/84
4,486,272                   06/447,799                   12/04/84
4,486,279                   06/493,843                   12/04/84
4,486,280                   06/508,564                   12/04/84
4,486,281                   06/501,912                   12/04/84
4,486,288                   06/357,289                   12/04/84
4,486,290                   06/519,938                   12/04/84
4,486,291                   06/415,277                   12/04/84
4,486,297                   06/223,783                   12/04/84
4,486,299                   06/416,775                   12/04/84
4,486,301                   06/571,320                   12/04/84
4,486,303                   06/482,141                   12/04/84
4,486,305                   06/528,983                   12/04/84
4,486,311                   06/589,044                   12/04/84
4,486,317                   06/415,681                   12/04/84
4,486,323                   06/456,917                   12/04/84
4,486,324                   06/318,744                   12/04/84
4,486,328                   06/491,010                   12/04/84
4,486,333                   06/361,058                   12/04/84
4,486,334                   06/362,535                   12/04/84
4,486,335                   06/412,654                   12/04/84
4,486,340                   06/391,953                   12/04/84
4,486,352                   06/481,299                   12/04/84
4,486,353                   06/415,235                   12/04/84
4,486,368                   06/431,485                   12/04/84
4,486,369                   06/550,124                   12/04/84
4,486,370                   06/502,069                   12/04/84
4,486,371                   06/416,123                   12/04/84
4,486,372                   06/537,790                   12/04/84
4,486,376                   06/392,169                   12/04/84
4,486,377                   06/424,642                   12/04/84
4,486,379                   06/505,153                   12/04/84
4,486,382                   06/344,232                   12/04/84
4,486,385                   06/243,771                   12/04/84
4,486,389                   06/392,641                   12/04/84
4,486,391                   06/409,305                   12/04/84
4,486,393                   06/469,140                   12/04/84
4,486,396                   06/504,286                   12/04/84
4,486,397                   06/565,998                   12/04/84
4,486,399                   06/510,459                   12/04/84
4,486,400                   06/498,140                   12/04/84
4,486,402                   06/449,867                   12/04/84
4,486,406                   06/339,630                   12/04/84
4,486,407                   06/470,740                   12/04/84
4,486,412                   06/475,491                   12/04/84
4,486,413                   06/416,761                   12/04/84
4,486,414                   06/477,045                   12/04/84
4,486,415                   06/523,224                   12/04/84
4,486,419                   06/532,058                   12/04/84
4,486,421                   06/443,272                   12/04/84
4,486,422                   06/443,418                   12/04/84
4,486,428                   06/457,171                   12/04/84
4,486,434                   06/391,076                   12/04/84
4,486,438                   06/498,832                   12/04/84
4,486,448                   06/434,186                   12/04/84
4,486,451                   06/387,476                   12/04/84
4,486,453                   06/453,090                   12/04/84
4,486,463                   06/563,950                   12/04/84
4,486,470                   06/532,537                   12/04/84
4,486,471                   06/375,046                   12/04/84
4,486,473                   06/534,369                   12/04/84
4,486,482                   06/504,450                   12/04/84
4,486,494                   06/556,745                   12/04/84
4,486,497                   06/395,966                   12/04/84
4,486,498                   06/528,445                   12/04/84
4,486,506                   06/434,370                   12/04/84
4,486,518                   06/420,766                   12/04/84
4,486,520                   06/558,224                   12/04/84
4,486,523                   06/438,284                   12/04/84
4,486,534                   06/379,794                   12/04/84
4,486,545                   06/477,759                   12/04/84
4,486,553                   06/365,501                   12/04/84
4,486,555                   06/431,468                   12/04/84
4,486,556                   06/431,509                   12/04/84
4,486,562                   06/590,170                   12/04/84
4,486,568                   06/453,917                   12/04/84
4,486,569                   06/492,872                   12/04/84
4,486,572                   06/511,252                   12/04/84
4,486,575                   06/481,369                   12/04/84
4,486,582                   06/461,342                   12/04/84
4,486,583                   06/525,700                   12/04/84
4,486,585                   06/537,379                   12/04/84
4,486,586                   06/465,374                   12/04/84
4,486,594                   06/484,549                   12/04/84
4,486,595                   06/543,807                   12/04/84
4,486,601                   06/524,484                   12/04/84
4,486,603                   06/420,186                   12/04/84
4,486,608                   06/487,476                   12/04/84
4,486,609                   06/326,952                   12/04/84
4,486,610                   06/464,531                   12/04/84
4,486,612                   06/478,183                   12/04/84
4,486,614                   06/517,171                   12/04/84
4,486,620                   06/481,155                   12/04/84
4,486,621                   06/376,865                   12/04/84
4,486,627                   06/449,339                   12/04/84
4,486,628                   06/236,906                   12/04/84
4,486,635                   06/510,492                   12/04/84
4,486,637                   06/394,495                   12/04/84
4,486,643                   06/382,453                   12/04/84
4,486,644                   06/602,638                   12/04/84
4,486,645                   06/297,392                   12/04/84
4,486,649                   06/488,451                   12/04/84
4,486,655                   06/365,850                   12/04/84
4,486,658                   06/403,884                   12/04/84
4,486,659                   06/420,223                   12/04/84
4,486,672                   06/355,237                   12/04/84
4,486,675                   06/348,755                   12/04/84
4,486,676                   06/571,260                   12/04/84
4,486,678                   06/529,473                   12/04/84
4,486,682                   06/476,009                   12/04/84
4,486,689                   06/467,775                   12/04/84
4,486,694                   06/380,254                   12/04/84
4,486,696                   06/508,066                   12/04/84
4,486,697                   06/496,703                   12/04/84
4,486,700                   06/492,538                   12/04/84
4,486,704                   06/398,654                   12/04/84
4,486,705                   06/557,524                   12/04/84
4,486,708                   06/332,926                   12/04/84
4,486,715                   06/404,955                   12/04/84
4,486,716                   06/388,386                   12/04/84
4,486,724                   06/485,531                   12/04/84
4,486,738                   06/349,080                   12/04/84
4,486,741                   06/255,256                   12/04/84
4,486,747                   06/311,764                   12/04/84
4,486,754                   06/342,232                   12/04/84
4,486,766                   06/326,467                   12/04/84
4,486,773                   06/381,511                   12/04/84
4,486,776                   06/386,708                   12/04/84
4,486,782                   06/385,635                   12/04/84
4,486,784                   06/453,021                   12/04/84
4,486,788                   06/365,890                   12/04/84
4,486,791                   06/374,781                   12/04/84
4,486,795                   06/451,830                   12/04/84
4,486,804                   06/480,260                   12/04/84
4,486,807                   06/349,045                   12/04/84
4,486,813                   06/560,690                   12/04/84
4,486,820                   06/283,823                   12/04/84
4,486,840                   06/311,427                   12/04/84
4,486,848                   06/402,523                   12/04/84
4,486,858                   06/513,610                   12/04/84
4,486,864                   06/284,854                   12/04/84
4,486,866                   06/316,006                   12/04/84
4,486,873                   06/389,355                   12/04/84
4,486,878                   06/408,339                   12/04/84
4,486,881                   06/274,382                   12/04/84
4,486,885                   06/596,072                   12/04/84
4,486,896                   06/406,602                   12/04/84
4,787,101                   07/044,803                   11/29/88
4,787,102                   07/019,765                   11/29/88
4,787,103                   06/911,610                   11/29/88
4,787,104                   06/662,355                   11/29/88
4,787,106                   06/925,635                   11/29/88
4,787,107                   07/043,182                   11/29/88
4,787,110                   07/072,469                   11/29/88
4,787,112                   07/090,482                   11/29/88
4,787,119                   07/089,876                   11/29/88
4,787,120                   07/065,601                   11/29/88
4,787,121                   07/109,149                   11/29/88
4,787,124                   07/096,193                   11/29/88
4,787,126                   07/126,325                   11/29/88
4,787,129                   06/628,178                   11/29/88
4,787,133                   07/153,051                   11/29/88
4,787,140                   06/897,815                   11/29/88
4,787,143                   06/865,067                   11/29/88
4,787,153                   07/139,441                   11/29/88
4,787,155                   07/063,973                   11/29/88
4,787,161                   07/073,229                   11/29/88
4,787,162                   06/890,023                   11/29/88
4,787,163                   07/027,392                   11/29/88
4,787,167                   06/945,496                   11/29/88
4,787,169                   07/148,280                   11/29/88
4,787,187                   07/089,729                   11/29/88
4,787,191                   07/069,762                   11/29/88
4,787,203                   07/010,064                   11/29/88
4,787,207                   06/922,339                   11/29/88
4,787,213                   06/940,027                   11/29/88
4,787,221                   07/048,423                   11/29/88
4,787,222                   06/933,994                   11/29/88
4,787,223                   06/942,344                   11/29/88
4,787,224                   07/043,158                   11/29/88
4,787,233                   07/087,298                   11/29/88
4,787,237                   06/901,438                   11/29/88
4,787,239                   07/142,120                   11/29/88
4,787,242                   07/075,930                   11/29/88
4,787,244                   07/154,271                   11/29/88
4,787,245                   07/050,239                   11/29/88
4,787,251                   07/073,731                   11/29/88
4,787,256                   07/042,653                   11/29/88
4,787,265                   06/905,136                   11/29/88
4,787,268                   07/036,511                   11/29/88
4,787,276                   07/048,372                   11/29/88
4,787,279                   07/147,794                   11/29/88
4,787,280                   06/889,987                   11/29/88
4,787,281                   07/021,760                   11/29/88
4,787,286                   07/084,618                   11/29/88
4,787,294                   07/079,011                   11/29/88
4,787,296                   07/128,208                   11/29/88
4,787,302                   07/109,600                   11/29/88
4,787,305                   07/044,050                   11/29/88
4,787,313                   07/061,645                   11/29/88
4,787,317                   07/106,157                   11/29/88
4,787,322                   07/161,003                   11/29/88
4,787,324                   07/070,916                   11/29/88
4,787,327                   07/019,437                   11/29/88
4,787,330                   07/136,355                   11/29/88
4,787,333                   07/020,883                   11/29/88
4,787,334                   07/030,126                   11/29/88
4,787,335                   07/074,149                   11/29/88
4,787,347                   07/101,634                   11/29/88
4,787,350                   07/092,889                   11/29/88
4,787,357                   06/923,865                   11/29/88
4,787,359                   06/930,886                   11/29/88
4,787,360                   07/041,506                   11/29/88
4,787,363                   07/078,883                   11/29/88
4,787,364                   07/098,624                   11/29/88
4,787,371                   07/070,035                   11/29/88
4,787,373                   07/062,017                   11/29/88
4,787,377                   07/047,858                   11/29/88
4,787,386                   06/923,490                   11/29/88
4,787,391                   07/085,249                   11/29/88
4,787,397                   07/060,463                   11/29/88
4,787,403                   07/052,992                   11/29/88
4,787,404                   07/061,840                   11/29/88
4,787,413                   06/940,381                   11/29/88
4,787,415                   07/100,027                   11/29/88
4,787,416                   07/005,933                   11/29/88
4,787,417                   07/124,568                   11/29/88
4,787,419                   07/052,947                   11/29/88
4,787,421                   07/063,796                   11/29/88
4,787,429                   07/075,776                   11/29/88
4,787,430                   07/059,654                   11/29/88
4,787,432                   07/207,511                   11/29/88
4,787,438                   07/014,654                   11/29/88
4,787,440                   07/088,747                   11/29/88
4,787,441                   07/071,126                   11/29/88
4,787,446                   07/045,093                   11/29/88
4,787,448                   07/086,555                   11/29/88
4,787,449                   07/157,677                   11/29/88
4,787,451                   06/940,682                   11/29/88
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