Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 3/21/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 32,525       06/797,656        11/13/85        10/20/87       03/24/97
4,385,634        06/257,166        04/24/81        05/31/83       03/26/97
4,420,907        06/217,987        12/18/80        12/20/83       03/24/97
4,426,021        06/318,600        11/05/81        01/17/84       03/26/97
4,612,578        06/720,650        04/04/85        09/16/86       03/26/97
4,631,124        06/735,790        05/20/85        12/23/86       03/26/97
4,638,512        06/721,887        04/11/85        01/27/87       03/21/97
4,644,556        06/573,752        01/25/84        02/17/87       03/21/97
4,644,810        06/691,862        01/16/85        02/24/87       03/21/97
4,648,083        06/716,569        01/03/85        03/03/87       03/24/97
4,651,372        06/757,957        07/23/85        03/24/87       03/21/97
4,697,623        06/899,068        08/21/86        10/06/87       03/21/97
4,717,042        06/868,660        05/28/86        01/05/88       03/28/97
4,717,548        06/421,344        09/22/82        01/05/88       03/21/97
4,732,062        07/003,861        01/16/87        03/22/88       03/21/97
4,762,747        06/891,655        07/29/86        08/09/88       03/25/97
4,770,080        07/086,409        08/17/87        09/13/88       03/28/97
4,770,446        07/035,670        04/08/87        09/13/88       03/27/97
4,772,193        07/020,713        03/02/87        09/20/88       03/28/97
4,773,834        07/024,423        03/10/87        09/27/88       03/28/97
4,779,411        06/946,751        12/29/86        10/25/88       03/21/97
4,782,335        06/925,653        10/30/86        11/01/88       03/24/97
4,797,779        07/104,685        10/05/87        01/10/89       03/28/97
4,804,392        07/097,887        09/17/87        02/14/89       03/24/97
4,829,545        06/899,626        08/25/86        05/09/89       03/28/97
4,994,668        07/402,174        09/01/89        02/19/91       03/25/97
5,012,797        07/461,624        01/08/90        05/07/91       03/25/97
5,024,032        07/336,254        04/11/89        06/18/91       03/21/97
5,043,749        07/458,940        12/29/89        08/27/91       03/21/97
5,079,029        07/366,951        06/16/89        01/07/92       03/21/97
5,084,717        07/607,762        10/30/90        01/28/92       03/21/97
5,088,056        07/587,044        09/24/90        02/11/92       03/26/97
5,088,723        07/620,559        12/03/90        02/18/92       03/21/97
5,091,677        07/653,305        02/11/91        02/25/92       03/28/97
5,092,473        07/701,192        05/16/91        03/03/92       03/27/97
5,102,529        07/656,598        02/19/91        04/07/92       03/21/97
5,103,946        07/609,626        11/06/90        04/14/92       03/28/97
5,106,518        07/611,995        11/09/90        04/21/92       03/24/97
5,108,527        07/339,183        04/17/89        04/28/92       03/28/97
5,117,774        07/689,983        04/23/91        06/02/92       03/26/97
5,118,206        07/685,039        04/15/91        06/02/92       03/21/97
5,127,108        07/690,010        04/23/91        07/07/92       03/28/97
5,128,912        07/219,553        07/14/88        07/07/92       03/21/97
5,145,549        07/747,791        08/19/91        09/08/92       03/24/97
5,146,743        07/604,060        10/25/90        09/15/92       03/26/97
5,149,026        07/751,137        08/28/91        09/22/92       03/25/97
5,157,132        07/525,545        05/18/90        10/20/92       03/21/97
5,161,799        07/837,950        02/20/92        11/10/92       03/26/97
5,163,462        07/748,670        08/22/91        11/17/92       03/21/97
5,165,045        07/774,781        10/10/91        11/17/92       03/24/97
5,169,200        07/875,261        04/27/92        12/08/92       03/25/97
5,170,620        07/693,141        04/29/91        12/15/92       03/25/97
5,172,313        07/463,161        01/10/90        12/15/92       03/21/97
5,178,649        07/454,791        12/21/89        01/12/93       03/27/97
7,179,292        07/894,476        06/05/92        01/12/93       03/25/97
5,179,831        07/561,093        07/31/90        01/19/93       03/24/97
5,180,014        07/655,086        02/14/91        01/19/93       03/27/97