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Publication numberUS3777283 B1
Publication typeGrant
Publication dateNov 19, 1985
Filing dateApr 21, 1972
Priority dateApr 21, 1972
Also published asCA973740A1, DE2318837A1, DE2318837C2
Publication numberUS 3777283 B1, US 3777283B1, US-B1-3777283, US3777283 B1, US3777283B1
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet

US 3777283 B1
Referenced by
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International ClassificationG02B21/34, G01N33/48
Cooperative ClassificationG02B21/34
European ClassificationG02B21/34
Legal Events
Nov 19, 1985B1Reexamination certificate first reexamination
Jan 8, 1985RRRequest for reexamination filed
Effective date: 19841203
Jul 17, 1984PSPatent suit(s) filed