Tamper-evident seal for envelope and method of making same

Details Tamper-evident seal for envelope and method of making same Tamper-evident seal for envelope and method of making same

1988-03-23

1989-05-30

Little, Willis

Flexible bags

Tamper indicating

383 84, 229102, 206807, B65D 3314

Patent

active

048345520

ABSTRACT:
A tamper-evident seal for a plastic envelope with a pocket and closing flap having an adhesive sealing means and a tamper-evident layer(s) between the sealing means and plastic pocket for visually determining when tampering has occurred, said means becoming disrupted and visually distorted when a tamper attempt has been made on the flap of the envelope and another tamper-evident layer(s) on the region of the plastic material where the seal is to be made.

REFERENCES:
patent: 1013571 (1912-01-01), Stevens
patent: 3368741 (1968-02-01), Mercur
patent: 3537638 (1970-11-01), Hyman
patent: 4082880 (1978-04-01), Zboril
patent: 4483018 (1984-11-01), Whelan
patent: 4510621 (1985-04-01), Saki et al.
patent: 4709397 (1987-11-01), Uoshall et al.
patent: 4712729 (1987-12-01), Craig
patent: 4720040 (1988-01-01), Gurewitz
patent: 4733817 (1988-03-01), Makowka
"The Keepsake System" Brochure (undated) of Mordon Wrappings, Ltd., UK.
"Safe-Gard Security Envelope" Brochure (undated) of Trigon Packaging Systems (N2) Ltd.; New Zealand.

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