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Class Information
Number: 229/81
Name: Envelopes, wrappers, and paperboard boxes > Envelope > Closures > Sealing > Perforated
Description: Envelope closures of the gummed type, but in which there are perforations for the purpose of preventing the opening of the envelope without detection.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7371008 |
Tamper-indicating resealable closure |
May. 13, 2008 |
| 7033657 |
Magnetic wafer seal |
Apr. 25, 2006 |
| 5791556 |
Easy opening envelope |
Aug. 11, 1998 |
| 5505376 |
Envelopes |
Apr. 9, 1996 |
| 5499757 |
Easy open, tamper evident envelope |
Mar. 19, 1996 |
| 5224779 |
Tamper-evident, reclosable flexible packages |
Jul. 6, 1993 |
| 5030189 |
Method of making envelope with tear line formed by ultrasonic energy |
Jul. 9, 1991 |
| 4982845 |
Resealable enclosure |
Jan. 8, 1991 |
| 4819807 |
Tear-strip opening envelope apparatus |
Apr. 11, 1989 |
| 4607749 |
Easy open envelope |
Aug. 26, 1986 |
| 4566627 |
Tamper detection envelope |
Jan. 28, 1986 |
| 4483018 |
High integrity tamper resistant container |
Nov. 13, 1984 |
| 4470511 |
Quick opening envelope |
Sep. 11, 1984 |
| 4288028 |
Remailable envelope |
Sep. 8, 1981 |
| 4093074 |
Envelopes |
Jun. 6, 1978 |
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