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 February 18, 1998
                    DUE TO FAILURE TO PAY MAINTENANCE FEES

Patent Number              Serial Number               Issue Date

Re. 33,208                  07/156,905                   05/01/90
Re. 34,370                  07/652,752                   09/07/93
4,570,268                   06/558,799                   02/18/86
4,570,286                   06/631,756                   02/18/86
4,570,287                   06/613,601                   02/18/86
4,570,291                   06/631,246                   02/18/86
4,570,309                   06/479,973                   02/18/86
4,570,327                   06/618,207                   02/18/86
4,570,330                   06/625,390                   02/18/86
4,570,339                   06/625,699                   02/18/86
4,570,346                   06/601,864                   02/18/86
4,570,347                   06/688,607                   02/18/86
4,570,352                   06/767,710                   02/18/86
4,570,359                   06/638,385                   02/18/86
4,570,361                   06/388,241                   02/18/86
4,570,364                   06/581,067                   02/18/86
4,570,367                   06/694,158                   02/18/86
4,570,369                   06/536,386                   02/18/86
4,570,377                   06/638,235                   02/18/86
4,570,380                   06/675,751                   02/18/86
4,570,381                   06/601,955                   02/18/86
4,570,382                   06/565,465                   02/18/86
4,570,384                   06/740,237                   02/18/86
4,570,386                   06/614,151                   02/18/86
4,570,387                   06/607,213                   02/18/86
4,570,393                   06/456,256                   02/18/86
4,570,400                   06/560,110                   02/18/86
4,570,407                   06/528,967                   02/18/86
4,570,408                   06/612,331                   02/18/86
4,570,415                   06/620,274                   02/18/86
4,570,417                   06/614,345                   02/18/86
4,570,427                   06/615,304                   02/18/86
4,570,433                   06/602,325                   02/18/86
4,570,440                   06/751,104                   02/18/86
4,570,453                   06/648,878                   02/18/86
4,570,455                   06/688,787                   02/18/86
4,570,460                   06/732,051                   02/18/86
4,570,467                   06/533,220                   02/18/86
4,570,480                   06/595,320                   02/18/86
4,570,489                   06/513,607                   02/18/86
4,570,490                   06/505,142                   02/18/86
4,570,495                   06/612,028                   02/18/86
4,570,499                   06/598,898                   02/18/86
4,570,502                   06/538,443                   02/18/86
4,570,506                   06/469,056                   02/18/86
4,570,508                   06/618,665                   02/18/86
4,570,515                   06/551,691                   02/18/86
4,570,527                   06/656,749                   02/18/86
4,570,534                   06/445,064                   02/18/86
4,570,536                   06/585,518                   02/18/86
4,570,539                   06/646,260                   02/18/86
4,570,551                   06/586,907                   02/18/86
4,570,558                   06/546,835                   02/18/86
4,570,561                   06/602,327                   02/18/86
4,570,563                   06/589,076                   02/18/86
4,570,575                   06/618,268                   02/18/86
4,570,579                   06/654,222                   02/18/86
4,570,581                   06/573,873                   02/18/86
4,570,582                   06/575,916                   02/18/86
4,570,591                   06/689,373                   02/18/86
4,570,595                   06/596,944                   02/18/86
4,570,597                   06/628,492                   02/18/86
4,570,598                   06/723,604                   02/18/86
4,570,604                   06/563,473                   02/18/86
4,570,605                   06/358,547                   02/18/86
4,570,607                   06/524,434                   02/18/86
4,570,614                   06/687,504                   02/18/86
4,570,616                   06/702,528                   02/18/86
4,570,623                   06/500,506                   02/18/86
4,570,627                   06/473,311                   02/18/86
4,570,653                   06/647,969                   02/18/86
4,570,662                   06/598,481                   02/18/86
4,570,681                   06/540,665                   02/18/86
4,570,687                   06/557,351                   02/18/86
4,570,693                   06/681,997                   02/18/86
4,570,695                   06/593,303                   02/18/86
4,570,697                   06/571,694                   02/18/86
4,570,702                   06/479,698                   02/18/86
4,570,706                   06/475,564                   02/18/86
4,570,711                   06/639,157                   02/18/86
4,570,712                   06/558,146                   02/18/86
4,570,721                   06/599,655                   02/18/86
4,570,734                   06/587,418                   02/18/86
4,570,738                   06/688,466                   02/18/86
4,570,742                   06/531,541                   02/18/86
4,570,743                   06/649,222                   02/18/86
4,570,745                   06/585,844                   02/18/86
4,570,746                   06/509,824                   02/18/86
4,570,750                   06/737,264                   02/18/86
4,570,757                   06/643,992                   02/18/86
4,570,767                   06/487,470                   02/18/86
4,570,780                   06/646,426                   02/18/86
4,570,798                   06/686,440                   02/18/86
4,570,815                   06/602,958                   02/18/86
4,570,817                   06/684,528                   02/18/86
4,570,823                   06/563,045                   02/18/86
4,570,827                   06/594,383                   02/18/86
4,570,837                   06/645,791                   02/18/86
4,570,839                   06/687,483                   02/18/86
4,570,847                   06/664,249                   02/18/86
4,570,852                   06/580,638                   02/18/86
4,570,854                   06/594,213                   02/18/86
4,570,858                   06/457,196                   02/18/86
4,570,865                   06/541,095                   02/18/86
4,570,869                   06/649,224                   02/18/86
4,570,872                   06/479,015                   02/18/86
4,570,876                   06/709,258                   02/18/86
4,570,880                   06/462,790                   02/18/86
4,570,901                   06/687,293                   02/18/86
4,570,903                   06/369,563                   02/18/86
4,570,909                   06/633,950                   02/18/86
4,570,916                   06/671,356                   02/18/86
4,570,923                   06/683,753                   02/18/86
4,570,936                   06/604,457                   02/18/86
4,570,963                   06/561,108                   02/18/86
4,570,968                   06/556,541                   02/18/86
4,570,971                   06/592,372                   02/18/86
4,570,981                   06/656,273                   02/18/86
4,570,997                   06/512,018                   02/18/86
4,570,999                   06/615,182                   02/18/86
4,571,002                   06/608,684                   02/18/86
4,571,003                   06/568,375                   02/18/86
4,571,004                   06/556,615                   02/18/86
4,571,006                   06/442,096                   02/18/86
4,571,012                   06/685,200                   02/18/86
4,571,013                   06/537,440                   02/18/86
4,571,016                   06/486,986                   02/18/86
4,571,022                   06/598,756                   02/18/86
4,571,023                   06/597,487                   02/18/86
4,5710,24                   06/545,307                   02/18/86
4,571,029                   06/566,757                   02/18/86
4,571,056                   06/590,721                   02/18/86
4,571,058                   06/669,490                   02/18/86
4,571,060                   06/663,270                   02/18/86
4,571,072                   06/537,901                   02/18/86
4,571,074                   06/452,480                   02/18/86
4,571,076                   06/512,203                   02/18/86
4,571,087                   06/477,612                   02/18/86
4,571,088                   06/661,695                   02/18/86
4,571,093                   06/548,611                   02/18/86
4,571,098                   06/714,170                   02/18/86
4,571,100                   06/598,440                   02/18/86
4,571,114                   06/460,386                   02/18/86
4,571,131                   06/577,012                   02/18/86
4,571,143                   06/599,343                   02/18/86
4,571,149                   06/485,076                   02/18/86
4,571,150                   06/642,200                   02/18/86
4,571,151                   06/526,664                   02/18/86
4,571,154                   06/623,240                   02/18/86
4,571,159                   06/708,023                   02/18/86
4,571,160                   06/633,836                   02/18/86
4,571,165                   06/635,527                   02/18/86
4,571,171                   06/597,552                   02/18/86
4,571,175                   06/728,284                   02/18/86
4,571,176                   06/609,432                   02/18/86
4,571,182                   06/573,827                   02/18/86
4,571,183                   06/523,833                   02/18/86
4,571,184                   06/491,966                   02/18/86
4,571,189                   06/727,598                   02/18/86
4,571,196                   06/575,825                   02/18/86
4,571,209                   06/492,442                   02/18/86
4,571,216                   06/739,739                   02/18/86
4,571,220                   06/377,184                   02/18/86
4,571,222                   06/484,161                   02/18/86
4,571,233                   06/568,815                   02/18/86
4,571,241                   06/562,094                   02/18/86
4,571,249                   06/523,272                   02/18/86
4,571,253                   06/634,424                   02/18/86
4,571,255                   06/566,745                   02/18/86
4,571,258                   06/612,309                   02/18/86
4,571,267                   06/550,225                   02/18/86
4,571,272                   06/526,583                   02/18/86
4,571,275                   06/562,927                   02/18/86
4,571,279                   06/555,836                   02/18/86
4,571,284                   06/673,405                   02/18/86
4,571,287                   06/582,148                   02/18/86
4,571,301                   06/652,749                   02/18/86
4,571,303                   06/693,705                   02/18/86
4,571,304                   06/712,054                   02/18/86
4,571,306                   06/604,795                   02/18/86
4,571,308                   06/730,970                   02/18/86
4,571,311                   06/693,406                   02/18/86
4,571,312                   06/607,993                   02/18/86
4,571,317                   06/643,109                   02/18/86
4,571,320                   06/667,169                   02/18/86
4,571,321                   06/566,520                   02/18/86
4,571,322                   06/751,926                   02/18/86
4,571,324                   06/535,851                   02/18/86
4,571,331                   06/560,389                   02/18/86
4,571,332                   06/427,299                   02/18/86
4,571,334                   06/327,396                   02/18/86
4,571,338                   06/620,348                   02/18/86
4,571,339                   06/699,362                   02/18/86
4,571,340                   06/570,723                   02/18/86
4,571,341                   06/634,834                   02/18/86
4,571,345                   06/503,853                   02/18/86
4,571,346                   06/636,537                   02/18/86
4,571,348                   06/638,906                   02/18/86
4,571,351                   06/616,229                   02/18/86
4,571,352                   06/691,922                   02/18/86
4,571,360                   06/715,169                   02/18/86
4,571,362                   06/420,903                   02/18/86
4,571,375                   06/613,550                   02/18/86
4,571,397                   06/467,259                   02/18/86
4,571,399                   06/634,494                   02/18/86
4,571,404                   06/618,445                   02/18/86
4,571,411                   06/695,874                   02/18/86
4,571,412                   06/676,403                   02/18/86
4,571,415                   06/656,198                   02/18/86
4,571,417                   06/542,283                   02/18/86
4,571,420                   06/581,466                   02/18/86
4,571,425                   06/701,833                   02/18/86
4,571,427                   06/644,770                   02/18/86
4,571,429                   06/730,155                   02/18/86
4,571,430                   06/555,782                   02/18/86
4,571,438                   06/714,410                   02/18/86
4,571,441                   06/515,927                   02/18/86
4,571,444                   06/603,028                   02/18/86
4,571,450                   06/565,941                   02/18/86
4,571,455                   06/558,434                   02/18/86
4,571,462                   06/663,603                   02/18/86
4,571,463                   06/616,317                   02/18/86
4,571,465                   06/539,584                   02/18/86
4,571,468                   06/399,017                   02/18/86
4,571,469                   06/631,154                   02/18/86
4,571,472                   06/685,485                   02/18/86
4,571,479                   06/588,418                   02/18/86
4,571,489                   06/510,164                   02/18/86
4,571,497                   06/409,754                   02/18/86
4,571,499                   06/579,848                   02/18/86
4,571,510                   06/535,831                   02/18/86
4,571,514                   06/444,919                   02/18/86
4,571,517                   06/660,647                   02/18/86
4,571,521                   06/525,758                   02/18/86
4,571,522                   06/607,910                   02/18/86
4,571,531                   06/598,988                   02/18/86
4,571,532                   06/548,540                   02/18/86
4,571,537                   06/724,815                   02/18/86
4,571,539                   06/327,643                   02/18/86
4,571,540                   06/532,009                   02/18/86
4,571,545                   06/601,448                   02/18/86
4,571,548                   06/465,954                   02/18/86
4,571,555                   06/595,019                   02/18/86
4,571,559                   06/659,844                   02/18/86
4,571,565                   06/639,417                   02/18/86
4,571,572                   06/715,258                   02/18/86
4,571,576                   06/546,991                   02/18/86
4,571,578                   06/486,478                   02/18/86
4,571,582                   06/505,158                   02/18/86
4,571,584                   06/516,257                   02/18/86
4,571,597                   06/707,524                   02/18/86
4,571,598                   06/577,049                   02/18/86
4,571,601                   06/695,901                   02/18/86
4,571,604                   06/642,973                   02/18/86
4,571,607                   06/573,601                   02/18/86
4,571,614                   06/495,433                   02/18/86
4,571,617                   06/574,460                   02/18/86
4,571,620                   06/549,489                   02/18/86
4,571,621                   06/504,705                   02/18/86
4,571,626                   06/415,544                   02/18/86
4,571,632                   06/526,763                   02/18/86
4,571,636                   06/563,834                   02/18/86
4,571,637                   06/572,676                   02/18/86
4,571,645                   06/690,514                   02/18/86
4,571,648                   06/467,202                   02/18/86
4,571,650                   06/529,679                   02/18/86
4,571,659                   06/513,283                   02/18/86
4,571,662                   06/618,750                   02/18/86
4,571,671                   06/494,250                   02/18/86
4,571,681                   06/572,628                   02/18/86
4,571,683                   06/403,042                   02/18/86
4,571,686                   06/456,724                   02/18/86
4,571,693                   06/473,811                   02/18/86
4,571,699                   06/384,708                   02/18/86
4,571,700                   06/504,825                   02/18/86
4,571,705                   06/527,483                   02/18/86
4,571,726                   06/595,210                   02/18/86
4,571,729                   06/523,673                   02/18/86
4,571,739                   06/533,002                   02/18/86
4,899,395                   07/327,684                   02/13/90
4,899,402                   07/251,160                   02/13/90
4,899,403                   07/319,219                   02/13/90
4,899,409                   07/351,748                   02/13/90
4,899,410                   07/059,613                   02/13/90
4,899,420                   07/242,353                   02/13/90
4,899,433                   07/254,214                   02/13/90
4,899,436                   07/258,733                   02/13/90
4,899,438                   07/253,577                   02/13/90
4,899,441                   07/323,084                   02/13/90
4,899,444                   07/194,197                   02/13/90
4,899,448                   07/194,319                   02/13/90
4,899,450                   07/229,635                   02/13/90
4,899,463                   07/251,542                   02/13/90
4,899,467                   07/226,240                   02/13/90
4,899,469                   07/230,416                   02/13/90
4,899,475                   07/216,414                   02/13/90
4,899,481                   07/255,744                   02/13/90
4,899,482                   07/385,360                   02/13/90
4,899,484                   07/353,488                   02/13/90
4,899,486                   07/072,259                   02/13/90
4,899,494                   07/298,375                   02/13/90
4,899,498                   07/253,063                   02/13/90
4,899,504                   07/345,192                   02/13/90
4,899,507                   07/160,318                   02/13/90
4,899,509                   07/053,159                   02/13/90
4,899,516                   07/254,624                   02/13/90
4,899,517                   07/105,722                   02/13/90
4,899,526                   07/229,845                   02/13/90
4,899,529                   07/283,308                   02/13/90
4,899,531                   07/254,874                   02/13/90
4,899,533                   07/275,404                   02/13/90
4,899,546                   07/265,903                   02/13/90
4,899,551                   07/114,541                   02/13/90
4,899,552                   07/353,402                   02/13/90
4,899,553                   07/366,621                   02/13/90
4,899,556                   07/252,588                   02/13/90
4,899,560                   07/341,973                   02/13/90
4,899,568                   07/255,688                   02/13/90
4,899,571                   07/222,270                   02/13/90
4,899,574                   07/305,530                   02/13/90
4,899,575                   07/226,300                   02/13/90
4,899,580                   07/228,181                   02/13/90
4,899,581                   07/351,330                   02/13/90
4,899,582                   07/172,492                   02/13/90
4,899,584                   07/265,786                   02/13/90
4,899,593                   07/320,347                   02/13/90
4,899,605                   07/331,328                   02/13/90
4,899,611                   07/195,564                   02/13/90
4,899,619                   07/239,570                   02/13/90
4,899,621                   07/307,250                   02/13/90
4,899,624                   07/183,246                   02/13/90
4,899,631                   07/198,191                   02/13/90
4,899,634                   07/335,875                   02/13/90
4,899,637                   06/638,564                   02/13/90
4,899,656                   07/321,315                   02/13/90
4,899,659                   07/374,038                   02/13/90
4,899,664                   07/012,608                   02/13/90
4,899,674                   07/330,567                   02/13/90
4,899,675                   07/330,572                   02/13/90
4,899,678                   07/331,158                   02/13/90
4,899,691                   07/323,185                   02/13/90
4,899,695                   07/310,560                   02/13/90
4,899,698                   07/216,200                   02/13/90
4,899,707                   07/156,570                   02/13/90
4,899,716                   07/291,758                   02/13/90
4,899,722                   07/240,750                   02/13/90
4,899,725                   07/348,882                   02/13/90
4,899,727                   07/326,014                   02/13/90
4,899,730                   07/281,286                   02/13/90
4,899,732                   07/240,032                   02/13/90
4,899,733                   07/286,561                   02/13/90
4,899,737                   07/244,161                   02/13/90
4,899,742                   07/023,651                   02/13/90
4,899,747                   06/529,609                   02/13/90
4,899,748                   07/237,127                   02/13/90
4,899,768                   07/289,833                   02/13/90
4,899,769                   07/257,223                   02/13/90
4,899,779                   07/336,390                   02/13/90
4,899,780                   07/340,600                   02/13/90
4,899,783                   07/346,066                   02/13/90
4,899,785                   07/254,896                   02/13/90
4,899,788                   07/190,880                   02/13/90
4,899,790                   07/237,758                   02/13/90
4,899,791                   07/305,072                   02/13/90
4,899,793                   07/334,790                   02/13/90
4,899,799                   07/364,618                   02/13/90
4,899,807                   07/248,172                   02/13/90
4,899,811                   07/300,775                   02/13/90
4,899,812                   07/240,282                   02/13/90
4,899,814                   07/138,358                   02/13/90
4,899,826                   07/173,424                   02/13/90
4,899,830                   07/359,515                   02/13/90
4,899,832                   07/133,246                   02/13/90
4,899,834                   07/138,891                   02/13/90
4,899,835                   07/348,910                   02/13/90
4,899,840                   07/369,867                   02/13/90
4,899,844                   07/300,010                   02/13/90
4,899,846                   07/046,687                   02/13/90
4,899,850                   07/266,777                   02/13/90
4,899,851                   07/371,381                   02/13/90
4,899,859                   07/266,126                   02/13/90
4,899,873                   07/161,853                   02/13/90
4,899,876                   07/341,692                   02/13/90
4,899,884                   07/2411,92                   02/13/90
4,899,893                   07/312,441                   02/13/90
4,899,894                   07/351,478                   02/13/90
4,899,896                   07/178,329                   02/13/90
4,899,899                   07/370,233                   02/13/90
4,899,901                   07/189,305                   02/13/90
4,899,903                   07/212,185                   02/13/90
4,899,904                   07/251,837                   02/13/90
4,899,907                   07/144,978                   02/13/90
4,899,910                   07/323,972                   02/13/90
4,899,911                   07/227,243                   02/13/90
4,899,920                   07/340,772                   02/13/90
4,899,923                   07/307,228                   02/13/90
4,899,947                   07/232,244                   02/13/90
4,899,948                   07/320,439                   02/13/90
4,899,950                   07/180,814                   02/13/90
4,899,954                   07/192,544                   02/13/90
4,899,956                   07/221,933                   02/13/90
4,899,958                   07/280,156                   02/13/90
4,899,959                   07/168,165                   02/13/90
4,899,969                   07/291,693                   02/13/90
4,899,970                   07/291,264                   02/13/90
4,899,974                   07/353,537                   02/13/90
4,899,981                   06/809,603                   02/13/90
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