Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 5/09/97

Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

4,398,228        06/258,402        04/28/81        08/09/83        05/13/97
4,619,486        06/618,492        06/08/84        10/28/86        05/09/97
4,623,795        06/613,860        05/24/84        11/18/86        05/13/97
4,651,893        06/898,806        08/21/86        03/24/87        05/13/97
4,723,373        06/923,676        10/27/86        02/09/88        05/12/97
4,732,062        07/003,861        01/16/87        03/22/88        05/15/97
4,763,544        06/609,235        05/11/84        08/16/88        05/14/97
4,802,390        07/028,188        03/19/87        02/07/89        05/15/97
4,962,560        07/202,235        06/03/88        10/16/90        05/13/97
4,998,711        07/484,174        02/23/90        03/12/91        05/12/97
5,003,547        07/459,211        12/29/89        03/26/91        05/13/97
5,004,801        07/274,216        11/21/88        04/02/91        05/13/97
5,031,205        07/513,097        04/23/90        07/09/91        05/14/97
5,036,533        07/478,674        02/12/90        07/30/91        05/15/97
5,048,301        07/539,330        06/13/90        09/17/91        05/13/97
5,070,560        07/601,314        10/22/90        12/10/91        05/13/97
5,102,138        07/702,394        05/20/91        04/07/92        05/15/97
5,111,574        07/279,777        12/05/88        05/12/92        05/14/97
5,113,334        07/477,978        06/14/90        05/12/92        05/12/97
5,121,716        07/715,812        06/17/91        06/16/92        05/13/97
5,131,685        07/782,629        10/25/91        07/21/92        05/14/97
5,143,378        07/641,203        01/15/91        09/01/92        05/13/97
5,155,901        07/814,502        12/30/91        10/20/92        05/13/97
5,159,654        07/782,557        10/25/91        10/27/92        05/09/97
5,163,400        07/638,698        01/08/91        11/17/92        05/15/97
5,167,801        07/718,594        06/21/91        12/01/92        15/15/97
5,173,376        07/783,005        10/28/91        12/22/92        05/13/97
5,173,377        07/783,006        10/28/91        12/22/92        05/13/97
5,174,343        07/639,576        01/09/91        12/29/92        05/12/97
5,176,411        07/628,610        12/17/90        01/05/93        05/15/97
5,180,263        07/843,217        02/28/92        01/19/93        05/13/97
5,182,533        07/775,286        10/11/91        01/26/93        05/12/97