NOTIFICATION OF ACCEPTANCE OF DELAYED PAYMENT OF MAINTENANCE FEE
                        (35 U.S.C. 41(c); 37 CFR 1.378)

   The patent(s) listed below are considered as not having expired but are
subject to the conditions set forth in 35 U.S.C. 41(c)(2), in view of the
Petition to Accept Late Payment of the maintenance fees which has been GRANTED
BY THE COMMISSIONER OF PATENTS AND TRADEMARKS, as provided for under 35 U.S.C.
41(c)(1) and 37 CFR 1.378.

                                                Application     Delayed Payment
Patent No.       Serial No.     Patent Date     Filing Date     Acceptance Date

Re. 33,806       07/441,900        01/28/92        11/27/89        01/30/95
(4,787,681)     (07/140,613)      (11/29/88)      (01/04/88)
4,330,639        06/218,620        05/18/82        12/22/80        08/31/94
4,354,409        06/231,247        10/19/82        02/03/81        01/31/95
4,433,211        06/317,947        02/21/84        11/04/81        01/03/95
4,490,089        06/411,914        12/25/84        08/25/84        12/06/94
4,519,220        06/468,071        05/28/85        02/22/83        02/15/95
4,527,522        06/457,555        07/09/85        01/13/83        02/15/95
4,571,973        06/603,189        02/25/86        04/23/84        01/31/95
4,573,927        06/645,235        03/04/86        08/29/84        02/09/95
4,597,177        06/567,704        07/01/86        01/03/84        01/31/95
4,796,413        07/138,570        01/10/89        12/28/87        02/15/95
4,829,296        06/858,363        05/09/89        04/30/86        02/15/95
4,909,696        07/333,012        03/20/90        04/04/89        02/09/95
4,934,290        07/260,875        06/19/90        10/21/88        02/09/95
4,940,368        07/187,468        07/10/90        04/28/88        01/17/95
4,958,084        06/564,702        09/18/90        12/23/83        02/15/95