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 main-
tenance 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 ap-
plicable surcharge.

                     PATENTS WHICH EXPIRED March 18, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,021                  07/165,682                   08/15/89
(4,576,592)                (06/480,527)                (03/18/86)
Re. 34,508                  07/846,493                   01/11/94
(4,908,223)                (07/336,048)                (03/13/90)
4,575,900                   06/702,374                   03/18/86
4,575,913                   06/514,474                   03/18/86
4,575,922                   06/668,512                   03/18/86
4,575,923                   06/482,671                   03/18/86
4,575,924                   06/626,809                   03/18/86
4,575,927                   06/518,597                   03/18/86
4,575,930                   06/564,054                   03/18/86
4,575,941                   06/691,365                   03/18/86
4,575,942                   06/542,991                   03/18/86
4,575,952                   06/649,601                   03/18/86
4,575,953                   06/588,714                   03/18/86
4,575,955                   06/396,548                   03/18/86
4,575,956                   06/645,183                   03/18/86
4,575,957                   06/617,204                   03/18/86
4,575,961                   06/530,559                   03/18/86
4,575,967                   06/623,452                   03/18/86
4,575,974                   06/591,266                   03/18/86
4,575,978                   06/594,368                   03/18/86
4,575,981                   06/579,681                   03/18/86
4,575,987                   06/727,328                   03/18/86
4,575,988                   06/445,565                   03/18/86
4,575,993                   06/504,526                   03/18/86
4,575,996                   06/690,779                   03/18/86
4,576,001                   06/573,312                   03/18/86
4,576,009                   06/693,151                   03/18/86
4,576,011                   06/641,413                   03/18/86
4,576,030                   06/528,067                   03/18/86
4,576,035                   06/763,891                   03/18/86
4,576,045                   06/566,865                   03/18/86
4,576,046                   06/680,415                   03/18/86
4,576,047                   06/606,250                   03/18/86
4,576,048                   06/622,227                   03/18/86
4,576,052                   06/613,968                   03/18/86
4,576,073                   06/509,918                   03/18/86
4,576,087                   06/689,646                   03/18/86
4,576,110                   06/496,099                   03/18/86
4,576,117                   06/624,451                   03/18/86
4,576,118                   06/707,880                   03/18/86
4,576,122                   06/591,415                   03/18/86
4,576,123                   06/632,976                   03/18/86
4,576,124                   06/664,638                   03/18/86
4,576,137                   06/757,072                   03/18/86
4,576,144                   06/724,938                   03/18/86
4,576,145                   06/582,517                   03/18/86
4,576,146                   06/592,210                   03/18/86
4,576,153                   06/579,543                   03/18/86
4,576,164                   06/551,344                   03/18/86
4,576,168                   06/455,651                   03/18/86
4,576,171                   06/578,269                   03/18/86
4,576,173                   06/629,854                   03/18/86
4,576,178                   06/479,203                   03/18/86
4,576,179                   06/492,056                   03/18/86
4,576,181                   06/608,761                   03/18/86
4,576,184                   06/603,243                   03/18/86
4,576,200                   06/716,037                   03/18/86
4,576,207                   06/465,719                   03/18/86
4,576,214                   06/568,492                   03/18/86
4,576,218                   06/724,809                   03/18/86
4,576,220                   06/564,823                   03/18/86
4,576,222                   06/413,584                   03/18/86
4,576,230                   06/731,592                   03/18/86
4,576,232                   06/507,835                   03/18/86
4,576,234                   06/727,609                   03/18/86
4,576,238                   06/525,118                   03/18/86
4,576,239                   06/644,627                   03/18/86
4,576,241                   06/553,409                   03/18/86
4,576,242                   06/641,636                   03/18/86
4,576,255                   06/622,916                   03/18/86
4,576,256                   06/548,008                   03/18/86
4,576,257                   06/629,931                   03/18/86
4,576,263                   06/592,505                   03/18/86
4,576,271                   06/520,718                   03/18/86
4,576,272                   06/623,027                   03/18/86
4,576,277                   06/541,008                   03/18/86
4,576,309                   06/755,990                   03/18/86
4,576,315                   06/609,512                   03/18/86
4,576,316                   06/641,479                   03/18/86
4,576,318                   06/634,953                   03/18/86
4,576,331                   06/673,602                   03/18/86
4,576,335                   06/595,559                   03/18/86
4,576,346                   06/608,383                   03/18/86
4,576,347                   06/666,524                   03/18/86
4,576,352                   06/425,058                   03/18/86
4,576,362                   06/648,757                   03/18/86
4,576,365                   06/604,602                   03/18/86
4,576,371                   06/497,974                   03/18/86
4,576,374                   06/641,700                   03/18/86
4,576,396                   06/708,273                   03/18/86
4,576,404                   06/520,433                   03/18/86
4,576,405                   06/759,512                   03/18/86
4,576,407                   06/694,022                   03/18/86
4,576,412                   06/711,648                   03/18/86
4,576,415                   06/465,222                   03/18/86
4,576,417                   06/697,743                   03/18/86
4,576,422                   06/705,971                   03/18/86
4,576,428                   06/665,661                   03/18/86
4,576,441                   06/585,815                   03/18/86
4,576,445                   06/612,069                   03/18/86
4,576,450                   06/579,161                   03/18/86
4,576,453                   06/637,597                   03/18/86
4,576,455                   06/578,890                   03/18/86
4,576,461                   06/585,466                   03/18/86
4,576,462                   06/678,316                   03/18/86
4,576,464                   06/682,763                   03/18/86
4,576,479                   06/495,129                   03/18/86
4,576,481                   06/449,235                   03/18/86
4,576,485                   06/738,517                   03/18/86
4,576,488                   06/707,094                   03/18/86
4,576,499                   06/431,635                   03/18/86
4,576,510                   06/568,182                   03/18/86
4,576,513                   06/425,899                   03/18/86
4,576,521                   06/567,068                   03/18/86
4,576,522                   06/653,803                   03/18/86
4,576,528                   06/588,922                   03/18/86
4,576,546                   06/611,262                   03/18/86
4,576,548                   06/571,612                   03/18/86
4,576,557                   06/504,435                   03/18/86
4,576,570                   06/618,706                   03/18/86
4,576,575                   06/740,563                   03/18/86
4,576,581                   06/595,306                   03/18/86
4,576,605                   06/707,145                   03/18/86
4,576,608                   06/549,805                   03/18/86
4,576,609                   06/650,066                   03/18/86
4,576,611                   06/615,988                   03/18/86
4,576,623                   06/592,940                   03/18/86
4,576,645                   06/678,697                   03/18/86
4,576,652                   06/630,057                   03/18/86
4,576,659                   06/446,300                   03/18/86
4,576,680                   06/577,081                   03/18/86
4,576,683                   06/617,701                   03/18/86
4,576,685                   06/726,049                   03/18/86
4,576,694                   06/643,762                   03/18/86
4,576,696                   06/652,343                   03/18/86
4,576,697                   06/487,148                   03/18/86
4,576,698                   06/509,518                   03/18/86
4,576,702                   06/668,562                   03/18/86
4,576,703                   06/668,571                   03/18/86
4,576,705                   06/613,969                   03/18/86
4,576,709                   06/618,635                   03/18/86
4,576,718                   06/672,441                   03/18/86
4,576,724                   06/707,529                   03/18/86
4,576,736                   06/591,074                   03/18/86
4,576,741                   06/671,473                   03/18/86
4,576,746                   06/354,572                   03/18/86
4,576,747                   06/608,005                   03/18/86
4,576,751                   06/407,027                   03/18/86
4,576,755                   06/660,266                   03/18/86
4,576,761                   06/732,112                   03/18/86
4,576,768                   06/624,983                   03/18/86
4,576,769                   06/594,635                   03/18/86
4,576,771                   06/641,801                   03/18/86
4,576,775                   06/411,294                   03/18/86
4,576,787                   06/564,048                   03/18/86
4,576,798                   06/506,312                   03/18/86
4,576,801                   06/629,475                   03/18/86
4,576,808                   06/566,130                   03/18/86
4,576,815                   06/541,120                   03/18/86
4,576,832                   06/640,223                   03/18/86
4,576,839                   06/673,143                   03/18/86
4,576,845                   06/561,945                   03/18/86
4,576,856                   06/621,461                   03/18/86
4,576,860                   06/764,577                   03/18/86
4,576,862                   06/754,774                   03/18/86
4,576,874                   06/657,421                   03/18/86
4,576,887                   06/551,275                   03/18/86
4,576,901                   06/626,759                   03/18/86
4,576,912                   06/470,516                   03/18/86
4,576,927                   06/668,795                   03/18/86
4,576,933                   06/490,224                   03/18/86
4,576,944                   06/660,218                   03/18/86
4,576,951                   06/680,004                   03/18/86
4,576,958                   06/573,214                   03/18/86
4,576,964                   06/618,151                   03/18/86
4,576,970                   06/703,844                   03/18/86
4,576,977                   06/637,833                   03/18/86
4,576,978                   06/699,759                   03/18/86
4,576,981                   06/603,684                   03/18/86
4,576,983                   06/716,524                   03/18/86
4,576,986                   06/619,504                   03/18/86
4,576,996                   06/707,431                   03/18/86
4,576,999                   06/375,676                   03/18/86
4,577,003                   06/716,481                   03/18/86
4,577,005                   06/620,006                   03/18/86
4,577,010                   06/689,093                   03/18/86
4,577,013                   06/680,690                   03/18/86
4,577,016                   06/481,924                   03/18/86
4,577,022                   06/506,277                   03/18/86
4,577,024                   06/412,444                   03/18/86
4,577,025                   06/527,179                   03/18/86
4,577,027                   06/468,282                   03/18/86
4,577,028                   06/434,433                   03/18/86
4,577,031                   06/715,218                   03/18/86
4,577,033                   06/691,037                   03/18/86
4,577,034                   06/701,835                   03/18/86
4,577,040                   06/552,578                   03/18/86
4,577,045                   06/714,369                   03/18/86
4,577,052                   06/421,944                   03/18/86
4,577,057                   06/585,711                   03/18/86
4,577,064                   06/764,518                   03/18/86
4,577,067                   06/538,820                   03/18/86
4,577,068                   06/554,540                   03/18/86
4,577,072                   06/567,100                   03/18/86
4,577,073                   06/691,015                   03/18/86
4,577,079                   06/726,993                   03/18/86
4,577,080                   06/713,460                   03/18/86
4,577,084                   06/687,418                   03/18/86
4,577,093                   06/581,045                   03/18/86
4,577,097                   06/414,698                   03/18/86
4,577,099                   06/626,366                   03/18/86
4,577,105                   06/602,391                   03/18/86
4,577,118                   06/630,530                   03/18/86
4,577,123                   06/502,866                   03/18/86
4,577,128                   06/689,449                   03/18/86
4,577,132                   06/662,946                   03/18/86
4,577,133                   06/546,103                   03/18/86
4,577,136                   06/546,265                   03/18/86
4,577,139                   06/635,050                   03/18/86
4,577,141                   06/675,323                   03/18/86
4,577,149                   06/675,051                   03/18/86
4,577,155                   06/532,514                   03/18/86
4,577,160                   06/564,360                   03/18/86
4,577,170                   06/696,928                   03/18/86
4,577,172                   06/659,893                   03/18/86
4,577,174                   06/709,788                   03/18/86
4,577,181                   06/707,950                   03/18/86
4,577,186                   06/578,642                   03/18/86
4,577,187                   06/543,741                   03/18/86
4,577,188                   06/412,968                   03/18/86
4,577,190                   06/483,645                   03/18/86
4,577,197                   06/692,260                   03/18/86
4,577,208                   06/421,932                   03/18/86
4,577,212                   06/626,274                   03/18/86
4,577,213                   06/586,161                   03/18/86
4,577,214                   06/584,299                   03/18/86
4,577,223                   06/447,906                   03/18/86
4,577,232                   06/646,400                   03/18/86
4,577,235                   06/642,605                   03/18/86
4,577,238                   06/487,686                   03/18/86
4,577,250                   06/448,564                   03/18/86
4,577,252                   06/390,556                   03/18/86
4,577,259                   06/492,519                   03/18/86
4,577,261                   06/645,902                   03/18/86
4,577,265                   06/671,500                   03/18/86
4,577,277                   06/525,896                   03/18/86
4,577,279                   06/499,624                   03/18/86
4,577,280                   06/548,478                   03/18/86
4,577,281                   06/562,378                   03/18/86
4,577,285                   06/497,808                   03/18/86
4,577,288                   06/274,050                   03/18/86
4,577,289                   06/567,294                   03/18/86
4,577,292                   06/499,729                   03/18/86
4,577,293                   06/616,046                   03/18/86
4,577,297                   06/753,818                   03/18/86
4,577,299                   06/497,201                   03/18/86
4,577,306                   06/719,622                   03/18/86
4,577,316                   06/579,608                   03/18/86
4,577,318                   06/551,081                   03/18/86
4,577,320                   06/575,042                   03/18/86
4,577,321                   06/533,187                   03/18/86
4,577,329                   06/539,582                   03/18/86
4,577,332                   06/474,788                   03/18/86
4,577,337                   06/612,477                   03/18/86
4,907,296                   07/210,475                   03/13/90
4,907,301                   07/260,198                   03/13/90
4,907,304                   07/165,803                   03/13/90
4,907,311                   07/201,768                   03/13/90
4,907,315                   07/280,724                   03/13/90
4,907,316                   07/302,949                   03/13/90
4,907,322                   07/178,358                   03/13/90
4,907,325                   07/230,143                   03/13/90
4,907,333                   07/235,687                   03/13/90
4,907,335                   07/209,257                   03/13/90
4,907,339                   07/094,807                   03/13/90
4,907,341                   07/140,294                   03/13/90
4,907,343                   07/320,343                   03/13/90
4,907,349                   07/207,504                   03/13/90
4,907,351                   07/277,663                   03/13/90
4,907,356                   07/299,639                   03/13/90
4,907,357                   07/159,673                   03/13/90
4,907,359                   07/136,752                   03/13/90
4,907,362                   07/165,532                   03/13/90
4,907,363                   07/239,279                   03/13/90
4,907,366                   07/413,284                   03/13/90
4,907,368                   07/244,321                   03/13/90
4,907,371                   07/291,932                   03/13/90
4,907,373                   07/111,029                   03/13/90
4,907,377                   07/207,685                   03/13/90
4,907,381                   07/263,703                   03/13/90
4,907,386                   07/216,669                   03/13/90
4,907,387                   07/210,038                   03/13/90
4,907,388                   07/231,218                   03/13/90
4,907,390                   07/332,144                   03/13/90
4,907,392                   07/161,119                   03/13/90
4,907,397                   07/257,067                   03/13/90
4,907,399                   07/193,274                   03/13/90
4,907,400                   07/242,884                   03/13/90
4,907,411                   07/201,367                   03/13/90
4,907,415                   07/276,137                   03/13/90
4,907,419                   07/218,233                   03/13/90
4,907,424                   07/295,123                   03/13/90
4,907,430                   07/232,215                   03/13/90
4,907,433                   07/182,521                   03/13/90
4,907,434                   07/253,582                   03/13/90
4,907,439                   07/119,352                   03/13/90
4,907,441                   07/236,936                   03/13/90
4,907,450                   07/247,955                   03/13/90
4,907,453                   07/298,822                   03/13/90
4,907,462                   07/298,012                   03/13/90
4,907,467                   07/246,825                   03/13/90
4,907,469                   07/273,705                   03/13/90
4,907,477                   07/227,064                   03/13/90
4,907,479                   07/177,968                   03/13/90
4,907,480                   07/138,712                   03/13/90
4,907,489                   07/238,450                   03/13/90
4,907,495                   07/298,296                   03/13/90
4,907,496                   07/263,297                   03/13/90
4,907,499                   07/337,055                   03/13/90
4,907,500                   07/314,732                   03/13/90
4,907,505                   07/251,069                   03/13/90
4,907,508                   07/273,383                   03/13/90
4,907,509                   07/214,369                   03/13/90
4,907,513                   07/195,322                   03/13/90
4,907,522                   07/300,378                   03/13/90
4,907,524                   07/228,716                   03/13/90
4,907,526                   07/217,941                   03/13/90
4,907,527                   07/133,419                   03/13/90
4,907,534                   07/282,082                   03/13/90
4,907,536                   07/145,131                   03/13/90
4,907,542                   07/326,043                   03/13/90
4,907,544                   07/334,449                   03/13/90
4,907,555                   07/207,047                   03/13/90
4,907,559                   07/332,607                   03/13/90
4,907,560                   07/270,530                   03/13/90
4,907,566                   07/349,598                   03/13/90
4,907,568                   07/196,944                   03/13/90
4,907,572                   07/329,042                   03/13/90
4,907,574                   07/229,335                   03/13/90
4,907,576                   07/298,423                   03/13/90
4,907,577                   07/331,818                   03/13/90
4,907,578                   07/247,495                   03/13/90
4,907,582                   07/342,021                   03/13/90
4,907,587                   07/256,503                   03/13/90
4,907,590                   07/224,006                   03/13/90
4,907,591                   07/174,570                   03/13/90
4,907,593                   07/052,262                   03/13/90
4,907,594                   07/210,089                   03/13/90
4,907,599                   07/231,907                   03/13/90
4,907,614                   07/216,358                   03/13/90
4,907,615                   07/116,912                   03/13/90
4,907,617                   07/269,170                   03/13/90
4,907,620                   07/243,814                   03/13/90
4,907,623                   07/204,915                   03/13/90
4,907,630                   07/160,270                   03/13/90
4,907,632                   07/223,064                   03/13/90
4,907,637                   06/917,604                   03/13/90
4,907,639                   07/322,434                   03/13/90
4,907,652                   07/302,669                   03/13/90
4,907,659                   07/145,294                   03/13/90
4,907,677                   07/147,865                   03/13/90
4,907,680                   07/150,112                   03/13/90
4,907,684                   07/324,203                   03/13/90
4,907,688                   07/220,916                   03/13/90
4,907,694                   07/307,920                   03/13/90
4,907,695                   07/401,703                   03/13/90
4,907,699                   07/318,914                   03/13/90
4,907,705                   07/355,258                   03/13/90
4,907,713                   07/329,166                   03/13/90
4,907,714                   07/316,230                   03/13/90
4,907,718                   07/279,560                   03/13/90
4,907,728                   07/100,568                   03/13/90
4,907,729                   07/148,603                   03/13/90
4,907,731                   07/108,348                   03/13/90
4,907,734                   07/263,806                   03/13/90
4,907,739                   06/931,682                   03/13/90
4,907,742                   07/212,779                   03/13/90
4,907,743                   07/269,725                   03/13/90
4,907,747                   07/257,879                   03/13/90
4,907,749                   06/515,266                   03/13/90
4,907,761                   07/285,600                   03/13/90
4,907,762                   07/280,129                   03/13/90
4,907,764                   07/204,019                   03/13/90
4,907,766                   07/301,318                   03/13/90
4,907,775                   07/312,086                   03/13/90
4,907,776                   07/230,968                   03/13/90
4,907,778                   07/276,958                   03/13/90
4,907,779                   07/376,381                   03/13/90
4,907,782                   07/215,768                   03/13/90
4,907,783                   07/232,177                   03/13/90
4,907,786                   07/235,558                   03/13/90
4,907,789                   07/088,807                   03/13/90
4,907,791                   07/226,221                   03/13/90
4,907,796                   07/171,957                   03/13/90
4,907,797                   07/198,568                   03/13/90
4,907,800                   07/101,248                   03/13/90
4,907,831                   07/172,766                   03/13/90
4,907,832                   07/237,956                   03/13/90
4,907,834                   07/161,691                   03/13/90
4,907,842                   07/263,624                   03/13/90
4,907,843                   07/228,981                   03/13/90
4,907,848                   07/231,334                   03/13/90
4,907,849                   07/233,519                   03/13/90
4,907,851                   07/099,548                   03/13/90
4,907,857                   07/366,762                   03/13/90
4,907,860                   07/163,856                   03/13/90
4,907,872                   07/201,759                   03/13/90
4,907,873                   07/205,282                   03/13/90
4,907,874                   07/228,465                   03/13/90
4,907,883                   07/195,922                   03/13/90
4,907,887                   07/269,816                   03/13/90
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