| Number | Date | Country | Kind |
|---|---|---|---|
| 2024854 | Sep 1990 | CAX |
| Filing Document | Filing Date | Country | Kind | 102e Date | 371c Date |
|---|---|---|---|---|---|
| PCT/CA91/00331 | 9/6/1991 | 3/23/1993 | 3/23/1993 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO92/04091 | 3/19/1992 |
| Number | Name | Date | Kind |
|---|---|---|---|
| 756341 | Dufty | Apr 1904 | |
| 1406765 | Shackle | Feb 1922 | |
| 1545240 | Edwards | Jul 1925 | |
| 1648196 | Rohmer | Nov 1927 | |
| 1660737 | Zeman | Feb 1928 | |
| 1752110 | Remy | Mar 1930 | |
| 2616485 | Robbins | Nov 1952 | |
| 2648538 | Robbins | Aug 1953 | |
| 2839299 | Weiss | Jun 1958 | |
| 3109645 | Thorson | Nov 1963 | |
| 3110047 | Bringman | Nov 1963 | |
| 3246892 | Grudoski | Apr 1966 | |
| 3451672 | Hancovsky | Jun 1969 | |
| 3539181 | Larsen | Nov 1970 | |
| 4199138 | Kaiser | Apr 1980 | |
| 4484739 | Kreinbihl | Nov 1984 | |
| 4805898 | Jacober | Feb 1989 | |
| 4932648 | Ahrens | Jun 1990 |
| Number | Date | Country |
|---|---|---|
| 1337048 | Jul 1963 | FRX |
| 2118446 | Feb 1983 | GBX |
| 2221848 | Feb 1990 | GBX |
| Entry |
|---|
| British Patent Specification 1488653. |
| Popular Mechanics, vol. 111, No. 6, Jun. 1959, p. 108. |