Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 03/27/98
   
Patent           Serial            Filing Date     Issue          Granted
Number           Number            Date            Date           Date

4,545,931        06/455,265        01/03/83        10/08/85       03/31/98
4,861,270        07/238,453        08/30/88        08/29/89       03/27/98
4,889,524        07/093,366        09/04/87        12/26/89       03/31/98
4,891,821        07/329,396        03/27/89        01/02/90       03/30/98
4,993,675        07/438,613        11/17/89        02/19/91       03/27/98
5,077,995        07/670,571        03/18/91        01/07/92       03/31/98
5,087,533        07/638,222        01/07/91        02/11/92       03/30/98
5,097,250        07/646,092        01/25/91        03/17/92       03/31/98
5,133,352        07/508,840        04/12/90        07/28/92       03/30/98
5,139,756        07/825,764        01/21/92        08/18/92       03/31/98
5,178,750        07/718,140        06/20/91        01/12/93       03/31/98
5,229,364        07/670,296        03/15/91        07/20/93       03/31/98
5,268,545        07/993,192        12/18/92        12/07/93       04/01/98