Number | Name | Date | Kind |
---|---|---|---|
1639495 | Frame | Aug 1927 | |
2593918 | Redman | Apr 1952 | |
3773428 | Bowman | Nov 1973 | |
4121390 | Hall et al. | Oct 1978 | |
4187647 | Hall | Feb 1980 | |
4188151 | Hall | Feb 1980 | |
4236358 | Bowman | Dec 1980 | |
4408421 | Pai | Oct 1983 | |
4690584 | LeBaron | Sep 1987 | |
4759656 | Wilson | Jul 1988 | |
4763449 | Vigneron et al. | Aug 1988 | |
4772154 | Caroulle | Sep 1988 | |
4834574 | Bowman | May 1989 | |
4844402 | Werner | Jul 1989 | |
4976568 | Hess | Dec 1990 | |
5030030 | Simmonds | Jul 1991 | |
5044818 | Pritchard | Sep 1991 | |
5051022 | Bowman | Sep 1991 | |
5143478 | Bowman | Sep 1992 | |
5205668 | Adams | Apr 1993 | |
5209601 | Odill et al. | May 1993 | |
5211504 | Trudel | May 1993 | |
5221155 | Neil | Jun 1993 | |
5362175 | Begin | Nov 1994 | |
5442882 | Repasky | Aug 1995 | |
5470172 | Wiedrich | Nov 1995 | |
5513926 | Prescott | May 1996 | |
5529431 | Walsh | Jun 1996 | |
5536110 | Tompkins et al. | Jul 1996 | |
5564855 | Anderson | Oct 1996 | |
5595455 | Svirklys | Jan 1997 |
Number | Date | Country |
---|---|---|
2270708 | Mar 1994 | GBX |
Entry |
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"Ingenious By Nature", Enviromax Rubber, Inc., Ontario Centre for Environmental Technology Advancement (OCETA), Enviro Frames and Enviro Levelling Rings, Oct. 1995. |