Assignee
21ST CENTURY ENVELOPE CO INC
3 granted patents·63 citations·filing 1979–1985
Technology mixB65D2
Top patents by PatentIndex Score
3 records- 0169USD268117SEnvelope21ST CENTURY ENVELOPE CO INC·Filed 1979·Granted Mar 1, 1983·9 cites·1 claims
- 0267US4332346ATwo-way envelope21ST CENTURY ENVELOPE CO INC·Filed 1981·Granted Jun 1, 1982·38 cites·6 claims
- 0339US4595138ATwo-way envelope21ST CENTURY ENVELOPE CO INC·Filed 1985·Granted Jun 17, 1986·16 cites·33 claims
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