| Number | Name | Date | Kind |
|---|---|---|---|
| 3710391 | McGlynn | Jan 1973 | |
| 3797040 | Caldwell | Mar 1974 | |
| 3978555 | Weisenthal | Sep 1976 | |
| 4179753 | Aronberg et al. | Dec 1979 | |
| 4796308 | Bourgeois | Jan 1989 | |
| 5123115 | Braswell-Moore | Jun 1992 | |
| 5341516 | Keim | Aug 1994 | |
| 5517698 | Nault et al. | May 1996 |
| Number | Date | Country |
|---|---|---|
| 0 052 067 A1 | May 1982 | EPX |
| 0 553 037 A1 | Jul 1993 | EPX |
| 2 619 989 A1 | Mar 1989 | FRX |
| 1 054 721 | Apr 1959 | DEX |
| 87 14 490 U | Nov 1988 | DEX |
| 1 405 623 | Sep 1975 | GBX |
| WO 8604791 A1 | Aug 1986 | WOX |
| Entry |
|---|
| International Search Report for PCT/US 97/23738, mailed on May 12, 1998, three pages. |