Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/08/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

RE34,009         07/652,562        02/07/91        07/28/92       01/11/99
4,789,286        07/058,673        05/27/87        12/06/88       01/11/99
4,805,896        07/111,676        10/23/87        02/21/89       01/14/99
4,976,812        07/449,100        12/04/89        12/11/90       01/12/99
4,997,325        07/343,529        04/26/89        03/05/91       01/14/99
5,148,445        07/588,999        09/26/90        09/15/92       01/12/99
5,227,537        07/818,040        01/08/92        07/13/93       01/11/99
5,241,551        07/889,580        05/28/92        08/31/93       01/11/99
5,260,173        07/511,201        04/19/90        11/09/93       01/08/99
5,277,331        07/981,261        11/25/92        01/11/94       01/11/99
5,293,994        08/051,009        04/21/93        03/15/94       01/11/99
5,297,888        08/006,561        01/21/93        03/29/94       01/11/99
5,307,731        07/979,185        11/19/92        05/03/94       01/14/99
5,313,991        08/019,168        02/02/93        05/24/94       01/11/99
5,322,022        07/998,620        12/30/92        06/21/94       01/12/99
5,325,123        07/869,740        04/16/92        06/28/94       01/12/99
5,328,027        08/099,934        07/29/93        07/12/94       01/12/99