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 18, 1996
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,119                  07/168,525                   11/28/89
(4,488,823)                (06/317,333)                (12/18/84)
Re. 33,180                  06/943,050                   03/13/90
(4,489,358)                (06/423,330)                (12/18/84)
Re. 34,057                  07/736,853                   09/08/92
(4,790,399)                (07/165,760)                (12/13/88)
Re. 34,170                  07/626,548                   02/02/93
(4,790,130)                (07/105,813)                (12/13/88)
4,488,326                   06/431,249                   12/18/84
4,488,328                   06/460,567                   12/18/84
4,488,335                   06/516,087                   12/18/84
4,488,337                   06/258,647                   12/18/84
4,488,338                   06/410,129                   12/18/84
4,488,339                   06/442,635                   12/18/84
4,488,341                   06/408,150                   12/18/84
4,488,344                   06/354,746                   12/18/84
4,488,346                   06/276,134                   12/18/84
4,488,347                   06/281,384                   12/18/84
4,488,349                   06/475,403                   12/18/84
4,488,356                   06/481,505                   12/18/84
4,488,359                   06/457,498                   12/18/84
4,488,361                   06/395,046                   12/18/84
4,488,367                   06/401,715                   12/18/84
4,488,368                   06/398,283                   12/18/84
4,488,376                   06/483,712                   12/18/84
4,488,381                   06/418,417                   12/18/84
4,488,384                   06/256,893                   12/18/84
4,488,388                   06/396,037                   12/18/84
4,488,390                   06/371,905                   12/18/84
4,488,392                   06/432,263                   12/18/84
4,488,393                   06/360,081                   12/18/84
4,488,399                   06/460,272                   12/18/84
4,488,406                   06/571,261                   12/18/84
4,488,407                   06/478,148                   12/18/84
4,488,410                   06/302,771                   12/18/84
4,488,417                   06/448,597                   12/18/84
4,488,419                   06/400,478                   12/18/84
4,488,426                   06/496,422                   12/18/84
4,488,444                   06/449,010                   12/18/84
4,488,447                   06/394,703                   12/18/84
4,488,454                   06/356,873                   12/18/84
4,488,472                   06/369,195                   12/18/84
4,488,474                   06/458,508                   12/18/84
4,488,475                   06/469,376                   12/18/84
4,488,478                   06/511,985                   12/18/84
4,488,485                   06/497,539                   12/18/84
4,488,495                   06/334,987                   12/18/84
4,488,498                   06/552,408                   12/18/84
4,488,502                   06/507,632                   12/18/84
4,488,507                   06/429,656                   12/18/84
4,488,517                   06/485,149                   12/18/84
4,488,522                   06/410,918                   12/18/84
4,488,529                   06/554,450                   12/18/84
4,488,535                   06/488,147                   12/18/84
4,488,543                   06/459,250                   12/18/84
4,488,546                   06/507,172                   12/18/84
4,488,552                   06/372,704                   12/18/84
4,488,562                   06/404,784                   12/18/84
4,488,566                   06/506,953                   12/18/84
4,488,572                   06/514,784                   12/18/84
4,488,587                   06/498,218                   12/18/84
4,488,590                   06/397,717                   12/18/84
4,488,591                   06/370,961                   12/18/84
4,488,592                   06/525,859                   12/18/84
4,488,594                   06/543,638                   12/18/84
4,488,595                   06/507,075                   12/18/84
4,488,598                   06/476,642                   12/18/84
4,488,607                   06/423,515                   12/18/84
4,488,609                   06/346,973                   12/18/84
4,488,619                   06/599,118                   12/18/84
4,488,622                   06/352,408                   12/18/84
4,488,625                   06/373,161                   12/18/84
4,488,632                   06/361,155                   12/18/84
4,488,646                   06/538,345                   12/18/84
4,488,649                   06/315,430                   12/18/84
4,488,650                   06/444,083                   12/18/84
4,488,658                   06/560,325                   12/18/84
4,488,659                   06/374,482                   12/18/84
4,488,661                   06/322,274                   12/18/84
4,488,666                   06/334,403                   12/18/84
4,488,682                   06/529,993                   12/18/84
4,488,685                   06/417,634                   12/18/84
4,488,686                   06/456,886                   12/18/84
4,488,695                   06/381,077                   12/18/84
4,488,696                   06/599,600                   12/18/84
4,488,708                   06/413,709                   12/18/84
4,488,710                   06/529,822                   12/18/84
4,488,714                   06/478,040                   12/18/84
4,488,717                   06/383,929                   12/18/84
4,488,718                   06/386,624                   12/18/84
4,488,720                   06/448,317                   12/18/84
4,488,735                   06/463,275                   12/18/84
4,488,737                   06/398,099                   12/18/84
4,488,740                   06/350,374                   12/18/84
4,488,741                   06/462,469                   12/18/84
4,488,742                   06/352,409                   12/18/84
4,488,754                   06/394,680                   12/18/84
4,488,755                   06/419,804                   12/18/84
4,488,757                   06/486,993                   12/18/84
4,488,758                   06/322,451                   12/18/84
4,488,762                   06/382,351                   12/18/84
4,488,764                   06/397,489                   12/18/84
4,488,772                   06/414,199                   12/18/84
4,488,773                   06/452,674                   12/18/84
4,488,778                   06/359,700                   12/18/84
4,488,790                   06/344,062                   12/18/84
4,488,794                   06/392,686                   12/18/84
4,488,795                   06/417,816                   12/18/84
4,488,802                   06/458,078                   12/18/84
4,488,803                   06/463,184                   12/18/84
4,488,804                   06/454,583                   12/18/84
4,488,805                   06/495,597                   12/18/84
4,488,814                   06/306,206                   12/18/84
4,488,816                   06/453,187                   12/18/84
4,488,817                   06/511,469                   12/18/84
4,488,825                   06/565,985                   12/18/84
4,488,834                   06/442,377                   12/18/84
4,488,853                   06/360,094                   12/18/84
4,488,861                   06/479,950                   12/18/84
4,488,864                   06/520,457                   12/18/84
4,488,867                   06/275,024                   12/18/84
4,488,871                   06/425,098                   12/18/84
4,488,886                   06/509,624                   12/18/84
4,488,888                   06/495,037                   12/18/84
4,488,892                   06/459,084                   12/18/84
4,488,901                   06/331,921                   12/18/84
4,488,903                   06/589,469                   12/18/84
4,488,908                   06/460,679                   12/18/84
4,488,910                   06/552,528                   12/18/84
4,488,920                   06/379,284                   12/18/84
4,488,930                   06/382,979                   12/18/84
4,488,932                   06/409,055                   12/18/84
4,488,934                   06/329,632                   12/18/84
4,488,936                   06/474,315                   12/18/84
4,488,937                   06/599,277                   12/18/84
4,488,940                   06/494,090                   12/18/84
4,488,944                   06/543,199                   12/18/84
4,488,947                   06/502,411                   12/18/84
4,488,948                   06/522,621                   12/18/84
4,488,951                   06/549,344                   12/18/84
4,488,952                   06/562,153                   12/18/84
4,488,957                   06/382,360                   12/18/84
4,488,962                   06/338,903                   12/18/84
4,488,971                   06/407,594                   12/18/84
4,488,977                   06/441,928                   12/18/84
4,488,979                   06/464,326                   12/18/84
4,488,982                   06/275,468                   12/18/84
4,488,995                   06/577,444                   12/18/84
4,488,999                   06/462,861                   12/18/84
4,489,007                   06/478,392                   12/18/84
4,489,010                   06/567,284                   12/18/84
4,489,017                   06/512,974                   12/18/84
4,489,020                   06/450,851                   12/18/84
4,489,021                   06/412,450                   12/18/84
4,489,023                   06/501,471                   12/18/84
4,489,024                   06/285,043                   12/18/84
4,489,030                   06/521,480                   12/18/84
4,489,031                   06/450,557                   12/18/84
4,489,045                   06/505,288                   12/18/84
4,489,049                   06/386,465                   12/18/84
4,489,052                   06/418,156                   12/18/84
4,489,056                   06/393,990                   12/18/84
4,489,059                   06/497,629                   12/18/84
4,489,062                   06/463,935                   12/18/84
4,489,075                   06/489,271                   12/18/84
4,489,076                   06/542,833                   12/18/84
4,489,080                   06/447,051                   12/18/84
4,489,082                   06/483,615                   12/18/84
4,489,083                   06/442,685                   12/18/84
4,489,091                   06/492,873                   12/18/84
4,489,093                   06/495,481                   12/18/84
4,489,107                   06/455,759                   12/18/84
4,489,110                   06/515,728                   12/18/84
4,489,112                   06/479,603                   12/18/84
4,489,113                   06/346,328                   12/18/84
4,489,133                   06/442,066                   12/18/84
4,489,134                   06/397,771                   12/18/84
4,489,137                   06/515,244                   12/18/84
4,489,138                   06/285,975                   12/18/84
4,489,143                   06/572,345                   12/18/84
4,489,147                   06/331,402                   12/18/84
4,489,161                   06/436,497                   12/18/84
4,489,164                   06/412,672                   12/18/84
4,489,165                   06/460,141                   12/18/84
4,489,168                   06/546,071                   12/18/84
4,489,177                   06/566,835                   12/18/84
4,489,180                   06/560,515                   12/18/84
4,489,185                   06/536,114                   12/18/84
4,489,186                   06/511,087                   12/18/84
4,489,188                   06/545,707                   12/18/84
4,489,191                   06/528,274                   12/18/84
4,489,201                   06/553,950                   12/18/84
4,489,202                   06/547,537                   12/18/84
4,489,205                   06/507,976                   12/18/84
4,489,208                   06/348,707                   12/18/84
4,489,210                   06/403,399                   12/18/84
4,489,215                   06/600,669                   12/18/84
4,489,217                   06/366,268                   12/18/84
4,489,218                   06/407,413                   12/18/84
4,489,223                   06/402,828                   12/18/84
4,489,224                   06/481,516                   12/18/84
4,489,226                   06/414,607                   12/18/84
4,489,227                   06/569,969                   12/18/84
4,489,232                   06/310,327                   12/18/84
4,489,235                   06/579,478                   12/18/84
4,489,238                   06/395,158                   12/18/84
4,489,255                   06/398,722                   12/18/84
4,489,256                   06/565,295                   12/18/84
4,489,258                   06/463,551                   12/18/84
4,489,259                   06/373,281                   12/18/84
4,489,261                   06/450,080                   12/18/84
4,489,265                   06/478,564                   12/18/84
4,489,271                   06/221,005                   12/18/84
4,489,272                   06/395,173                   12/18/84
4,489,285                   06/482,792                   12/18/84
4,489,295                   06/450,857                   12/18/84
4,489,298                   06/540,100                   12/18/84
4,489,299                   06/461,795                   12/18/84
4,489,300                   06/555,593                   12/18/84
4,489,317                   06/574,189                   12/18/84
4,489,331                   06/341,580                   12/18/84
4,489,333                   06/508,683                   12/18/84
4,489,347                   06/413,003                   12/18/84
4,489,348                   06/422,361                   12/18/84
4,489,351                   06/419,518                   12/18/84
4,489,353                   06/434,102                   12/18/84
4,489,361                   06/438,253                   12/18/84
4,489,363                   06/462,275                   12/18/84
4,489,365                   06/419,235                   12/18/84
4,489,371                   06/371,089                   12/18/84
4,489,374                   06/418,176                   12/18/84
4,489,375                   06/367,831                   12/18/84
4,489,376                   06/367,828                   12/18/84
4,489,377                   06/415,093                   12/18/84
4,489,387                   06/294,671                   12/18/84
4,489,388                   06/310,582                   12/18/84
4,489,397                   06/573,588                   12/18/84
4,489,399                   06/354,500                   12/18/84
4,489,400                   06/353,783                   12/18/84
4,489,408                   06/328,969                   12/18/84
4,489,409                   06/436,885                   12/18/84
4,489,411                   06/552,021                   12/18/84
4,489,412                   06/420,208                   12/18/84
4,489,416                   06/476,682                   12/18/84
4,489,417                   06/444,102                   12/18/84
4,489,426                   06/334,032                   12/18/84
4,489,439                   06/420,282                   12/18/84
4,790,044                   06/916,776                   12/13/88
4,790,047                   07/176,959                   12/13/88
4,790,049                   07/040,062                   12/13/88
4,790,059                   07/143,075                   12/13/88
4,790,073                   07/130,164                   12/13/88
4,790,074                   06/825,276                   12/13/88
4,790,076                   06/934,894                   12/13/88
4,790,080                   07/014,265                   12/13/88
4,790,081                   07/051,765                   12/13/88
4,790,082                   07/056,843                   12/13/88
4,790,085                   07/048,326                   12/13/88
4,790,089                   06/925,365                   12/13/88
4,790,090                   07/044,989                   12/13/88
4,790,095                   07/092,128                   12/13/88
4,790,108                   07/046,199                   12/13/88
4,790,110                   07/056,062                   12/13/88
4,790,113                   07/063,724                   12/13/88
4,790,114                   07/047,167                   12/13/88
4,790,120                   07/018,880                   12/13/88
4,790,129                   06/942,953                   12/13/88
4,790,131                   07/091,892                   12/13/88
4,790,140                   07/115,630                   12/13/88
4,790,141                   07/132,024                   12/13/88
4,790,148                   07/130,942                   12/13/88
4,790,150                   07/139,805                   12/13/88
4,790,152                   07/119,769                   12/13/88
4,790,154                   07/061,620                   12/13/88
4,790,155                   06/932,020                   12/13/88
4,790,156                   07/090,327                   12/13/88
4,790,160                   07/020,874                   12/13/88
4,790,161                   07/074,266                   12/13/88
4,790,166                   06/880,874                   12/13/88
4,790,168                   06/903,155                   12/13/88
4,790,169                   07/152,672                   12/13/88
4,790,179                   07/105,301                   12/13/88
4,790,190                   07/104,801                   12/13/88
4,790,193                   07/164,793                   12/13/88
4,790,195                   06/926,108                   12/13/88
4,790,196                   07/092,663                   12/13/88
4,790,200                   06/465,029                   12/13/88
4,790,202                   06/933,539                   12/13/88
4,790,210                   07/097,719                   12/13/88
4,790,215                   07/133,232                   12/13/88
4,790,217                   06/894,277                   12/13/88
4,790,218                   07/122,759                   12/13/88
4,790,224                   07/087,663                   12/13/88
4,790,227                   07/070,306                   12/13/88
4,790,228                   07/070,554                   12/13/88
4,790,229                   07/072,331                   12/13/88
4,790,233                   07/071,164                   12/13/88
4,790,241                   07/039,312                   12/13/88
4,790,242                   07/133,373                   12/13/88
4,790,246                   07/103,496                   12/13/88
4,790,248                   06/775,490                   12/13/88
4,790,249                   07/050,281                   12/13/88
4,790,250                   07/157,085                   12/13/88
4,790,252                   07/123,258                   12/13/88
4,790,254                   07/147,163                   12/13/88
4,790,264                   07/064,100                   12/13/88
4,790,267                   07/136,833                   12/13/88
4,790,272                   07/108,456                   12/13/88
4,790,284                   06/782,959                   12/13/88
4,790,286                   07/126,059                   12/13/88
4,790,298                   07/082,155                   12/13/88
4,790,302                   07/060,119                   12/13/88
4,790,303                   07/024,577                   12/13/88
4,790,305                   06/877,331                   12/13/88
4,790,307                   06/941,311                   12/13/88
4,790,319                   06/834,917                   12/13/88
4,790,320                   06/589,973                   12/13/88
4,790,329                   07/062,443                   12/13/88
4,790,334                   07/009,949                   12/13/88
4,790,337                   07/107,916                   12/13/88
4,790,341                   07/146,884                   12/13/88
4,790,342                   07/126,359                   12/13/88
4,790,345                   07/157,207                   12/13/88
4,790,346                   07/095,429                   12/13/88
4,790,347                   07/116,299                   12/13/88
4,790,350                   07/039,164                   12/13/88
4,790,353                   06/625,198                   12/13/88
4,790,369                   07/148,283                   12/13/88
4,790,378                   07/012,076                   12/13/88
4,790,383                   07/104,455                   12/13/88
4,790,385                   06/670,835                   12/13/88
4,790,389                   06/854,533                   12/13/88
4,790,395                   07/013,428                   12/13/88
4,790,396                   06/879,137                   12/13/88
4,790,400                   07/075,475                   12/13/88
4,790,402                   07/101,508                   12/13/88
4,790,403                   06/943,010                   12/13/88
4,790,405                   07/102,060                   12/13/88
4,790,406                   07/119,713                   12/13/88
4,790,408                   07/148,050                   12/13/88
4,790,409                   07/050,152                   12/13/88
4,790,410                   07/136,348                   12/13/88
4,790,416                   06/942,454                   12/13/88
4,790,420                   06/881,929                   12/13/88
4,790,423                   06/931,738                   12/13/88
4,790,425                   06/938,649                   12/13/88
4,790,426                   07/079,400                   12/13/88
4,790,431                   07/032,386                   12/13/88
4,790,438                   07/033,722                   12/13/88
4,790,439                   06/935,820                   12/13/88
4,790,444                   07/100,111                   12/13/88
4,790,447                   06/910,298                   12/13/88
4,790,448                   07/093,980                   12/13/88
4,790,450                   06/420,017                   12/13/88
4,790,453                   06/947,893                   12/13/88
4,790,461                   07/140,563                   12/13/88
4,790,469                   06/896,066                   12/13/88
4,790,472                   07/013,219                   12/13/88
4,790,476                   07/162,103                   12/13/88
4,790,479                   07/154,461                   12/13/88
4,790,484                   06/922,014                   12/13/88
4,790,490                   07/162,211                   12/13/88
4,790,501                   07/076,879                   12/13/88
4,790,506                   07/086,296                   12/13/88
4,790,511                   06/906,452                   12/13/88
4,790,516                   06/865,301                   12/13/88
4,790,517                   07/139,476                   12/13/88
4,790,518                   06/852,593                   12/13/88
4,790,519                   06/946,973                   12/13/88
4,790,523                   06/897,837                   12/13/88
4,790,532                   07/121,273                   12/13/88
4,790,538                   07/083,318                   12/13/88
4,790,540                   07/075,155                   12/13/88
4,790,550                   07/013,906                   12/13/88
4,790,554                   06/934,276                   12/13/88
4,790,561                   07/136,561                   12/13/88
4,790,569                   07/002,072                   12/13/88
4,790,570                   07/051,955                   12/13/88
4,790,571                   07/038,034                   12/13/88
4,790,572                   07/138,617                   12/13/88
4,790,578                   06/776,890                   12/13/88
4,790,580                   07/041,957                   12/13/88
4,790,581                   07/091,046                   12/13/88
4,790,582                   06/914,658                   12/13/88
4,790,586                   07/117,188                   12/13/88
4,790,587                   07/071,986                   12/13/88
4,790,588                   07/063,994                   12/13/88
4,790,589                   07/065,336                   12/13/88
4,790,592                   07/048,056                   12/13/88
4,790,593                   06/924,980                   12/13/88
4,790,598                   07/106,455                   12/13/88
4,790,612                   06/906,865                   12/13/88
4,790,614                   06/929,911                   12/13/88
4,790,615                   07/021,756                   12/13/88
4,790,617                   07/022,912                   12/13/88
4,790,620                   06/326,252                   12/13/88
4,790,621                   07/129,502                   12/13/88
4,790,626                   07/105,364                   12/13/88
4,790,627                   07/058,415                   12/13/88
4,790,636                   06/943,233                   12/13/88
4,790,638                   06/913,078                   12/13/88
4,790,639                   07/073,994                   12/13/88
4,790,640                   06/786,745                   12/13/88
4,790,641                   06/937,366                   12/13/88
4,790,642                   06/936,245                   12/13/88
4,790,643                   07/024,077                   12/13/88
4,790,644                   06/931,692                   12/13/88
4,790,656                   07/042,622                   12/13/88
4,790,659                   07/108,510                   12/13/88
4,790,663                   07/109,956                   12/13/88
4,790,666                   07/010,920                   12/13/88
4,790,668                   07/145,136                   12/13/88
4,790,669                   06/849,435                   12/13/88
4,790,671                   07/165,840                   12/13/88
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