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Class Information
Number: 229/929
Name: Envelopes, wrappers, and paperboard boxes > Vented envelope
Description: Envelope including means to facilitate or enable entrapped air to escape.

Patents under this class:

Patent Number Title Of Patent Date Issued
6613571 Method and system for detecting biological and chemical hazards in mail Sep. 2, 2003
6540131 Stationery Apr. 1, 2003
4669651 Multi-pocket envelope having displaced pockets of uniform size Jun. 2, 1987
4050582 Sealed envelope assembly with locking pockets for free insert material Sep. 27, 1977

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