Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 10/31/97

Patent           Serial            Filing Date     Issue          Granted
Number           Number            Date            Date           Date

5,059,071        07/510,864        04/17/90        10/22/91       11/04/97
5,138,566        07/590,764        10/01/90        08/11/92       11/04/97
5,221,627        07/689,750        05/24/91        06/22/93       11/04/97

                 Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 11/07/97

Patent           Serial            Filing Date     Issue          Granted
Number           Number            Date            Date           Date

4,469,739        06/516,517        07/26/83        09/04/84       11/07/97
4,501,347        06/511,353        07/06/83        02/26/85       11/07/97
4,529,246        06/248,852        03/30/81        07/16/85       11/07/97
4,804,377        07/082,084        08/05/87        02/14/89       11/10/97
5,217,999        07/856,849        03/24/92        06/08/93       11/07/97