Notice of Expiration of Patents
                     Due to Failure to Pay Maintenance Fee

   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 appli-
cable surcharge.

                    PATENTS WHICH EXPIRED December 11, 1996
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number             Serial Number                Issue Date

Re. 32,559                  06/933,009                   12/15/87
(4,487,468)                (06/453,653)                (12/11/84)
Re. 32,735                  06/886,518                   08/23/88
(4,488,042)                (06/368,494)                (12/11/84)
Re. 33,999                  07/624,586                   07/21/92
(4,789,461)                (06/892,380)                (12/06/88)
4,486,901                   06/478,681                   12/11/84
4,486,903                   06/575,479                   12/11/84
4,486,905                   06/337,075                   12/11/84
4,486,906                   06/502,692                   12/11/84
4,486,912                   06/503,058                   12/11/84
4,486,917                   06/348,608                   12/11/84
4,486,927                   06/494,627                   12/11/84
4,486,936                   06/308,122                   12/11/84
4,486,939                   06/430,229                   12/11/84
4,486,946                   06/513,208                   12/11/84
4,486,947                   06/417,414                   12/11/84
4,486,968                   06/450,069                   12/11/84
4,486,978                   06/407,256                   12/11/84
4,486,981                   06/486,950                   12/11/84
4,486,982                   06/451,446                   12/11/84
4,486,990                   06/370,525                   12/11/84
4,486,997                   06/546,638                   12/11/84
4,486,998                   06/376,169                   12/11/84
4,487,004                   06/500,896                   12/11/84
4,487,005                   06/405,337                   12/11/84
4,487,007                   06/507,926                   12/11/84
4,487,011                   06/367,168                   12/11/84
4,487,014                   06/374,383                   12/11/84
4,487,015                   06/470,546                   12/11/84
4,487,019                   06/580,786                   12/11/84
4,487,020                   06/516,323                   12/11/84
4,487,023                   06/414,213                   12/11/84
4,487,031                   06/540,268                   12/11/84
4,487,035                   06/487,816                   12/11/84
4,487,037                   06/512,147                   12/11/84
4,487,041                   06/246,092                   12/11/84
4,487,042                   06/352,091                   12/11/84
4,487,044                   06/509,599                   12/11/84
4,487,054                   06/502,092                   12/11/84
4,487,058                   06/463,646                   12/11/84
4,487,070                   06/410,946                   12/11/84
4,487,073                   06/460,941                   12/11/84
4,487,074                   06/468,396                   12/11/84
4,487,077                   06/494,792                   12/11/84
4,487,081                   06/412,384                   12/11/84
4,487,082                   06/453,010                   12/11/84
4,487,090                   06/412,760                   12/11/84
4,487,093                   06/310,678                   12/11/84
4,487,098                   06/510,231                   12/11/84
4,487,105                   06/492,322                   12/11/84
4,487,111                   06/294,130                   12/11/84
4,487,112                   06/432,906                   12/11/84
4,487,119                   06/293,687                   12/11/84
4,487,120                   06/485,235                   12/11/84
4,487,123                   06/521,654                   12/11/84
4,487,124                   06/521,655                   12/11/84
4,487,131                   06/303,075                   12/11/84
4,487,133                   06/425,034                   12/11/84
4,487,138                   06/449,796                   12/11/84
4,487,151                   06/378,174                   12/11/84
4,487,153                   06/429,237                   12/11/84
4,487,154                   06/434,574                   12/11/84
4,487,158                   06/502,871                   12/11/84
4,487,159                   06/448,567                   12/11/84
4,487,168                   06/403,130                   12/11/84
4,487,188                   06/443,679                   12/11/84
4,487,192                   06/485,985                   12/11/84
4,487,193                   06/543,472                   12/11/84
4,487,197                   06/371,476                   12/11/84
4,487,219                   06/492,941                   12/11/84
4,487,228                   06/562,548                   12/11/84
4,487,235                   06/497,524                   12/11/84
4,487,236                   06/450,680                   12/11/84
4,487,238                   06/416,299                   12/11/84
4,487,244                   06/300,165                   12/11/84
4,487,245                   06/291,949                   12/11/84
4,487,246                   06/367,270                   12/11/84
4,487,258                   06/523,376                   12/11/84
4,487,267                   06/461,259                   12/11/84
4,487,272                   06/424,986                   12/11/84
4,487,282                   06/370,532                   12/11/84
4,487,288                   06/392,521                   12/11/84
4,487,292                   06/386,993                   12/11/84
4,487,296                   06/445,264                   12/11/84
4,487,315                   06/469,450                   12/11/84
4,487,318                   06/329,825                   12/11/84
4,487,322                   06/424,687                   12/11/84
4,487,334                   06/369,023                   12/11/84
4,487,335                   06/465,797                   12/11/84
4,487,337                   06/311,201                   12/11/84
4,487,341                   06/307,546                   12/11/84
4,487,344                   06/288,104                   12/11/84
4,487,351                   06/492,610                   12/11/84
4,487,353                   06/322,569                   12/11/84
4,487,354                   06/316,713                   12/11/84
4,487,357                   06/381,334                   12/11/84
4,487,367                   06/434,279                   12/11/84
4,487,372                   06/369,069                   12/11/84
4,487,373                   06/474,159                   12/11/84
4,487,375                   06/466,950                   12/11/84
4,487,380                   06/422,908                   12/11/84
4,487,392                   06/417,565                   12/11/84
4,487,393                   06/387,007                   12/11/84
4,487,405                   06/472,725                   12/11/84
4,487,406                   06/459,911                   12/11/84
4,487,409                   06/403,358                   12/11/84
4,487,426                   06/378,992                   12/11/84
4,487,432                   06/312,703                   12/11/84
4,487,436                   06/346,936                   12/11/84
4,487,438                   06/233,802                   12/11/84
4,487,442                   06/428,253                   12/11/84
4,487,460                   06/535,494                   12/11/84
4,487,469                   06/401,292                   12/11/84
4,487,471                   06/456,533                   12/11/84
4,487,472                   06/394,831                   12/11/84
4,487,486                   06/396,407                   12/11/84
4,487,495                   06/454,713                   12/11/84
4,487,496                   06/375,457                   12/11/84
4,487,499                   06/525,614                   12/11/84
4,487,509                   06/458,560                   12/11/84
4,487,510                   06/589,864                   12/11/84
4,487,518                   06/372,908                   12/11/84
4,487,522                   06/379,303                   12/11/84
4,487,525                   06/524,217                   12/11/84
4,487,527                   06/409,369                   12/11/84
4,487,528                   06/439,557                   12/11/84
4,487,529                   06/337,567                   12/11/84
4,487,530                   06/419,388                   12/11/84
4,487,531                   06/433,807                   12/11/84
4,487,539                   06/460,533                   12/11/84
4,487,548                   06/495,987                   12/11/84
4,487,566                   06/512,482                   12/11/84
4,487,574                   06/451,505                   12/11/84
4,487,575                   06/471,703                   12/11/84
4,487,576                   06/461,185                   12/11/84
4,487,583                   06/273,774                   12/11/84
4,487,595                   06/449,045                   12/11/84
4,487,596                   06/337,632                   12/11/84
4,487,604                   06/421,546                   12/11/84
4,487,607                   06/371,131                   12/11/84
4,487,609                   06/520,655                   12/11/84
4,487,632                   06/522,133                   12/11/84
4,487,633                   06/507,544                   12/11/84
4,487,636                   06/442,332                   12/11/84
4,487,639                   06/456,209                   12/11/84
4,487,644                   06/423,458                   12/11/84
4,487,650                   06/586,904                   12/11/84
4,487,656                   06/537,876                   12/11/84
4,487,661                   06/530,449                   12/11/84
4,487,665                   06/217,319                   12/11/84
4,487,672                   06/438,130                   12/11/84
4,487,685                   06/507,585                   12/11/84
4,487,689                   06/585,084                   12/11/84
4,487,693                   06/554,795                   12/11/84
4,487,710                   06/353,756                   12/11/84
4,487,714                   06/571,898                   12/11/84
4,487,718                   06/580,807                   12/11/84
4,487,721                   06/502,042                   12/11/84
4,487,725                   06/495,510                   12/11/84
4,487,727                   06/264,975                   12/11/84
4,487,730                   06/408,996                   12/11/84
4,487,731                   06/537,832                   12/11/84
4,487,732                   06/513,891                   12/11/84
4,487,733                   06/514,074                   12/11/84
4,487,737                   06/342,535                   12/11/84
4,487,738                   06/477,459                   12/11/84
4,487,746                   06/467,276                   12/11/84
4,487,752                   06/521,232                   12/11/84
4,487,759                   06/240,990                   12/11/84
4,487,760                   06/340,764                   12/11/84
4,487,765                   06/542,774                   12/11/84
4,487,768                   06/452,301                   12/11/84
4,487,769                   06/492,903                   12/11/84
4,487,773                   06/509,266                   12/11/84
4,487,787                   06/436,294                   12/11/84
4,487,792                   06/390,538                   12/11/84
4,487,793                   06/546,325                   12/11/84
4,487,794                   06/597,026                   12/11/84
4,487,798                   06/498,502                   12/11/84
4,487,799                   06/576,774                   12/11/84
4,487,803                   06/516,835                   12/11/84
4,487,811                   06/461,809                   12/11/84
4,487,821                   06/276,887                   12/11/84
4,487,823                   06/437,553                   12/11/84
4,487,826                   06/458,717                   12/11/84
4,487,833                   06/353,089                   12/11/84
4,487,858                   06/540,079                   12/11/84
4,487,866                   06/506,580                   12/11/84
4,487,867                   06/506,759                   12/11/84
4,487,870                   06/453,399                   12/11/84
4,487,872                   06/511,708                   12/11/84
4,487,876                   06/596,251                   12/11/84
4,487,877                   06/430,050                   12/11/84
4,487,878                   06/591,969                   12/11/84
4,487,881                   06/538,301                   12/11/84
4,487,883                   06/534,845                   12/11/84
4,487,886                   06/544,730                   12/11/84
4,487,895                   06/615,687                   12/11/84
4,487,896                   06/528,932                   12/11/84
4,487,898                   06/384,936                   12/11/84
4,487,902                   06/507,082                   12/11/84
4,487,907                   06/560,705                   12/11/84
4,487,908                   06/579,231                   12/11/84
4,487,912                   06/579,236                   12/11/84
4,487,913                   06/588,598                   12/11/84
4,487,914                   06/580,704                   12/11/84
4,487,915                   06/576,304                   12/11/84
4,487,921                   06/550,971                   12/11/84
4,487,925                   06/461,817                   12/11/84
4,487,926                   06/570,205                   12/11/84
4,487,933                   06/491,680                   12/11/84
4,487,935                   06/468,283                   12/11/84
4,487,936                   06/428,915                   12/11/84
4,487,938                   06/420,810                   12/11/84
4,487,946                   06/503,952                   12/11/84
4,487,947                   06/421,208                   12/11/84
4,487,948                   06/477,993                   12/11/84
4,487,955                   06/511,506                   12/11/84
4,487,958                   06/428,816                   12/11/84
4,487,961                   06/349,145                   12/11/84
4,487,967                   06/565,097                   12/11/84
4,487,969                   06/429,762                   12/11/84
4,487,974                   06/469,183                   12/11/84
4,487,975                   06/407,059                   12/11/84
4,487,976                   06/412,711                   12/11/84
4,487,983                   06/536,672                   12/11/84
4,487,984                   06/584,375                   12/11/84
4,487,985                   06/526,852                   12/11/84
4,487,994                   06/319,429                   12/11/84
4,487,996                   06/446,193                   12/11/84
4,488,000                   06/429,785                   12/11/84
4,488,007                   06/450,252                   12/11/84
4,488,015                   06/401,365                   12/11/84
4,488,020                   06/468,925                   12/11/84
4,488,022                   06/438,691                   12/11/84
4,488,032                   06/619,432                   12/11/84
4,488,034                   06/398,116                   12/11/84
4,488,045                   06/412,215                   12/11/84
4,488,047                   06/324,964                   12/11/84
4,488,049                   06/319,444                   12/11/84
4,488,054                   06/484,274                   12/11/84
4,488,063                   06/310,381                   12/11/84
4,488,074                   06/425,070                   12/11/84
4,488,077                   06/327,170                   12/11/84
4,488,078                   06/409,234                   12/11/84
4,488,080                   06/492,980                   12/11/84
4,488,085                   06/360,436                   12/11/84
4,488,091                   06/440,907                   12/11/84
4,488,092                   06/390,078                   12/11/84
4,488,103                   06/459,874                   12/11/84
4,488,104                   06/441,743                   12/11/84
4,488,107                   06/374,246                   12/11/84
4,488,109                   06/456,503                   12/11/84
4,488,112                   06/412,758                   12/11/84
4,488,114                   06/360,901                   12/11/84
4,488,118                   06/304,483                   12/11/84
4,488,119                   06/345,863                   12/11/84
4,488,125                   06/395,368                   12/11/84
4,488,132                   06/448,970                   12/11/84
4,488,136                   06/526,205                   12/11/84
4,488,137                   06/527,003                   12/11/84
4,488,146                   06/358,159                   12/11/84
4,488,157                   06/350,739                   12/11/84
4,488,158                   06/547,855                   12/11/84
4,488,177                   06/442,938                   12/11/84
4,488,179                   06/304,982                   12/11/84
4,488,194                   06/351,342                   12/11/84
4,488,197                   06/381,960                   12/11/84
4,488,198                   06/378,644                   12/11/84
4,488,210                   06/482,979                   12/11/84
4,488,211                   06/408,890                   12/11/84
4,488,214                   06/441,660                   12/11/84
4,488,216                   06/490,079                   12/11/84
4,488,220                   06/359,829                   12/11/84
4,488,236                   06/369,302                   12/11/84
4,488,240                   06/344,561                   12/11/84
4,488,255                   06/313,916                   12/11/84
4,488,261                   06/353,356                   12/11/84
4,488,277                   06/347,608                   12/11/84
4,488,292                   06/328,954                   12/11/84
4,488,298                   06/388,834                   12/11/84
4,488,301                   06/383,447                   12/11/84
4,788,722                   07/164,953                   12/06/88
4,788,723                   07/107,055                   12/06/88
4,788,732                   06/824,200                   12/06/88
4,788,740                   07/078,559                   12/06/88
4,788,742                   07/134,377                   12/06/88
4,788,744                   07/138,579                   12/06/88
4,788,745                   07/059,500                   12/06/88
4,788,759                   06/935,229                   12/06/88
4,788,760                   07/054,266                   12/06/88
4,788,761                   07/066,840                   12/06/88
4,788,762                   07/088,764                   12/06/88
4,788,766                   07/051,797                   12/06/88
4,788,768                   07/024,776                   12/06/88
4,788,773                   06/805,845                   12/06/88
4,788,774                   07/136,787                   12/06/88
4,788,781                   07/051,766                   12/06/88
4,788,782                   07/055,956                   12/06/88
4,788,787                   07/100,933                   12/06/88
4,788,788                   07/176,236                   12/06/88
4,788,790                   06/871,326                   12/06/88
4,788,791                   06/947,697                   12/06/88
4,788,792                   07/039,386                   12/06/88
4,788,793                   06/472,449                   12/06/88
4,788,796                   07/086,778                   12/06/88
4,788,800                   07/067,543                   12/06/88
4,788,804                   07/047,322                   12/06/88
4,788,806                   06/841,593                   12/06/88
4,788,809                   07/028,166                   12/06/88
4,788,814                   07/089,743                   12/06/88
4,788,819                   07/108,734                   12/06/88
4,788,820                   07/050,025                   12/06/88
4,788,825                   07/162,837                   12/06/88
4,788,838                   07/019,518                   12/06/88
4,788,839                   06/466,975                   12/06/88
4,788,842                   06/938,238                   12/06/88
4,788,851                   07/091,670                   12/06/88
4,788,853                   06/916,239                   12/06/88
4,788,858                   07/081,990                   12/06/88
4,788,860                   07/088,690                   12/06/88
4,788,867                   06/947,640                   12/06/88
4,788,869                   06/879,628                   12/06/88
4,788,870                   07/057,421                   12/06/88
4,788,875                   07/092,819                   12/06/88
4,788,878                   07/061,513                   12/06/88
4,788,879                   07/097,731                   12/06/88
4,788,880                   07/041,797                   12/06/88
4,788,883                   07/119,442                   12/06/88
4,788,886                   07/003,388                   12/06/88
4,788,893                   07/036,469                   12/06/88
4,788,897                   07/114,517                   12/06/88
4,788,899                   06/294,254                   12/06/88
4,788,903                   06/912,416                   12/06/88
4,788,910                   06/514,099                   12/06/88
4,788,912                   07/031,700                   12/06/88
4,788,921                   07/057,252                   12/06/88
4,788,923                   07/114,864                   12/06/88
4,788,927                   07/150,470                   12/06/88
4,788,932                   07/016,241                   12/06/88
4,788,934                   07/065,405                   12/06/88
4,788,949                   06/848,277                   12/06/88
4,788,952                   06/939,120                   12/06/88
4,788,962                   07/104,294                   12/06/88
4,788,976                   07/062,113                   12/06/88
4,788,982                   07/003,035                   12/06/88
4,788,996                   07/126,713                   12/06/88
4,788,997                   06/936,637                   12/06/88
4,788,999                   07/072,273                   12/06/88
4,789,001                   06/916,230                   12/06/88
4,789,004                   07/088,800                   12/06/88
4,789,012                   07/029,431                   12/06/88
4,789,018                   07/141,583                   12/06/88
4,789,019                   07/050,906                   12/06/88
4,789,021                   06/913,504                   12/06/88
4,789,022                   07/171,189                   12/06/88
4,789,026                   07/066,562                   12/06/88
4,789,028                   07/051,160                   12/06/88
4,789,029                   07/115,517                   12/06/88
4,789,042                   07/023,774                   12/06/88
4,789,049                   07/173,552                   12/06/88
4,789,053                   07/044,791                   12/06/88
4,789,057                   07/170,309                   12/06/88
4,789,062                   07/068,109                   12/06/88
4,789,067                   07/129,595                   12/06/88
4,789,075                   07/078,785                   12/06/88
4,789,077                   07/159,924                   12/06/88
4,789,081                   07/061,704                   12/06/88
4,789,083                   06/913,570                   12/06/88
4,789,086                   07/167,156                   12/06/88
4,789,089                   07/072,752                   12/06/88
4,789,093                   07/130,052                   12/06/88
4,789,094                   07/153,267                   12/06/88
4,789,098                   07/018,991                   12/06/88
4,789,099                   07/009,243                   12/06/88
4,789,101                   07/021,841                   12/06/88
4,789,114                   07/085,206                   12/06/88
4,789,115                   06/901,634                   12/06/88
4,789,121                   07/045,943                   12/06/88
4,789,125                   06/940,749                   12/06/88
4,789,128                   06/920,745                   12/06/88
4,789,129                   07/085,447                   12/06/88
4,789,131                   07/094,683                   12/06/88
4,789,133                   07/058,921                   12/06/88
4,789,134                   07/077,506                   12/06/88
4,789,140                   06/874,038                   12/06/88
4,789,152                   07/072,874                   12/06/88
4,789,158                   07/047,317                   12/06/88
4,789,161                   07/065,672                   12/06/88
4,789,164                   07/071,552                   12/06/88
4,789,171                   07/072,838                   12/06/88
4,789,176                   07/129,234                   12/06/88
4,789,178                   07/047,476                   12/06/88
4,789,181                   07/009,503                   12/06/88
4,789,182                   07/156,276                   12/06/88
4,789,184                   07/085,356                   12/06/88
4,789,187                   07/011,625                   12/06/88
4,789,188                   06/880,076                   12/06/88
4,789,196                   06/902,761                   12/06/88
4,789,198                   07/071,759                   12/06/88
4,789,201                   07/094,284                   12/06/88
4,789,202                   07/072,511                   12/06/88
4,789,203                   07/015,189                   12/06/88
4,789,206                   07/034,929                   12/06/88
4,789,209                   06/870,582                   12/06/88
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