Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 05/08/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,527,146        06/564,100        12/22/83        07/02/85       05/11/98
4,832,797        06/936,720        11/25/86        05/23/89       05/13/98
4,854,630        07/152,627        02/05/88        08/08/89       05/14/98
4,859,325        07/183,228        04/19/88        08/22/89       05/13/98
4,892,790        06/805,887        12/06/85        01/09/90       05/14/98
5,108,648        07/599,183        10/17/90        04/28/92       05/13/98
5,151,896        07/586,440        09/21/90        09/29/92       05/14/98
5,164,517        07/647,084        01/29/91        11/17/92       05/13/98
5,169,548        07/691,876        04/26/91        12/08/92       05/14/98
5,188,434        07/687,877        06/03/91        02/23/93       05/13/98
5,202,372        07/890,376        05/26/92        04/13/93       05/14/98
5,239,774        07/719,375        06/24/91        08/31/93       05/13/98
5,252,467        07/817,916        01/06/92        10/12/93       05/14/98
5,270,244        08/008,766        01/25/93        12/14/93       05/14/98
5,271,885        07/845,286        03/03/92        12/21/93       05/14/98
5,285,590        07/957,368        10/07/92        02/15/94       05/13/98