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Publication numberUS3647293 B1
Publication typeGrant
Publication dateAug 18, 1987
Filing dateDec 1, 1970
Priority dateDec 1, 1970
Also published asCA944012A, CA944012A1
Publication numberUS 3647293 B1, US 3647293B1, US-B1-3647293, US3647293 B1, US3647293B1
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet

US 3647293 B1
Abstract  available in
Description  available in
Claims  available in
Referenced by
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International ClassificationG03G21/10, G03G15/00, G03G15/09, G03G9/10, G03G21/00, G03G15/22
Cooperative ClassificationG03G2221/0005, G03G21/0047, G03G15/09, G03G9/10
European ClassificationG03G15/09, G03G9/10, G03G21/00B4
Legal Events
Aug 18, 1987B1Reexamination certificate first reexamination
Apr 19, 1983RRRequest for reexamination filed
Effective date: 19830309