Number | Name | Date | Kind |
---|---|---|---|
2359038 | Hopff et al. | Feb 1944 | |
2421876 | Gerhart | Jun 1947 | |
2479846 | Gerhart | Aug 1949 | |
2537845 | Morris et al. | Jan 1951 | |
2560119 | McCaslin et al. | Jul 1951 | |
3838113 | Smallman | Sep 1974 | |
4126738 | Gaylord | Nov 1978 | |
4202955 | Gaylord | May 1980 |
Entry |
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U.S.S.R. Inventors Certificate SU891,707, Published Dec. 23, 1981. |