Number | Name | Date | Kind |
---|---|---|---|
1978721 | Perkins | Oct 1934 | |
3106722 | Logan et al. | Oct 1963 | |
3413660 | Lagarelli et al. | Dec 1968 | |
3599251 | Wright | Aug 1971 | |
3792814 | Platz | Feb 1974 | |
3809315 | Wright | May 1974 | |
4012798 | Liautaud | Mar 1977 | |
4084270 | Kersten, Jr. | Apr 1978 | |
4363146 | Liautaud | Dec 1982 | |
4675924 | Allison et al. | Jun 1987 | |
4688276 | Allison et al. | Aug 1987 | |
4939800 | Fiorentino et al. | Jul 1990 | |
5157798 | Van Kammen | Oct 1992 | |
5216765 | Paterson et al. | Jun 1993 | |
5265288 | Alison | Nov 1993 | |
5293833 | West et al. | Mar 1994 | |
5381567 | Tanner et al. | Jan 1995 |
Entry |
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Advertisement by Guardian Equipment titled: Quality Features and Options, no publication date (believed to have been printed in mid-to-late 1970s), showing drawing of the dust cover described in the specification, p. 2, lines 25-28. |
Encon News Bulletin, Encon Manufacturing Company, 4914 Dickson Street, Houston, Texas 77007. |