Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 02/13/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,362,403        06/289,793        08/03/81        12/07/82       02/18/98
4,508,907        06/431,373        09/30/82        04/02/85       02/13/98
4,523,588        06/372,124        04/27/82        06/18/85       02/17/98
4,535,314        06/563,250        12/19/83        08/13/85       02/13/98
4,687,420        06/877,456        06/23/86        08/18/87       02/17/98
4,708,079        06/647,549        09/05/84        11/24/87       02/18/98
4,761,066        06/819,155        01/14/86        08/02/88       02/13/98
4,787,448        07/086,555        08/18/87        11/29/88       02/18/98
4,801,138        07/127,113        12/01/87        01/31/89       02/19/98
4,801,921        07/088,252        08/24/87        01/31/89       02/18/98
4,846,979        07/084,454        08/12/87        07/11/89       02/18/98
4,847,835        06/820,254        11/05/85        07/11/89       02/18/98
4,866,162        06/914,556        10/02/86        09/12/89       02/13/98
4,866,431        07/158,584        02/22/88        09/12/89       02/17/98
4,873,268        06/917,887        10/14/86        10/10/89       02/18/98
4,874,435        07/138,349        12/28/87        10/17/89       02/13/98
4,879,820        07/227,574        08/03/88        11/14/89       02/13/98
4,943,282        07/311,044        03/13/89        07/24/90       02/18/98
4,964,554        07/397,773        08/23/89        10/23/90       02/19/98
4,977,718        07/352,756        05/16/89        12/18/90       02/18/98
5,070,546        07/537,910        06/12/90        12/10/91       02/13/98
5,075,025        07/362,356        06/06/89        12/24/91       02/18/98
5,077,939        07/618,488        11/27/90        01/07/92       02/13/98
5,112,328        07/563,849        08/07/90        05/12/92       02/17/98
5,127,675        07/524,548        05/17/90        07/07/92       02/18/98
5,129,828        07/685,284        04/15/91        07/14/92       02/17/98
5,132,996        07/554,883        07/20/90        07/21/92       02/13/98
5,153,926        07/446,493        12/05/89        10/06/92       02/18/98
5,180,483        07/766,254        09/27/91        01/19/93       02/18/98
5,183,143        07/708,288        05/31/91        02/02/93       02/18/98
5,198,922        07,670,784        03/19/91        03/30/93       02/18/98
5,220,076        07/890,087        05/29/92        06/15/93       02/13/98
5,221,153        07/743,153        08/12/91        06/22/93       02/18/98
5,237,108        07,890,083        05/29/92        08/17/93       02/13/98
5,244,636        07/645,787        01/25/91        09/14/93       02/17/98
5,244,813        07/870,949        04/20/92        09/14/93       02/13/98
5,245,065        07/971,876        11/05/92        09/14/93       02/13/98
5,250,664        07/778,448        10/16/91        10/05/93       02/18/98
5,252,066        07/936,977        08/28/92        10/12/93       02/13/98
5,253,498        07/933,776        08/24/92        10/19/93       02/18/98
5,254,750        08/042,550        04/05/93        10/19/93       02/18/98
5,257,513        07,912,156        07/10/92        11/02/93       02/18/98
5,260,883        07/816,578        01/03/92        11/09/93       02/17/98