Sealed letter

Details Sealed letter Sealed letter

1987-01-27

1989-01-31

Little, Willis

Envelopes, wrappers, and paperboard boxes

Envelope

Display

229 68R, 229 73, B65D 2704

Patent

active

048010740

ABSTRACT:
The invention relates to an envelope having a transparent layer, allowing printed information on the letter paper in the envelope to appear through the envelope. The inner surface of the transparent layer is laminated with a transparent, thermal adhering synthetic resin film to bind the transparent layer to a second layer along their periphery.

REFERENCES:
patent: 3431404 (1969-03-01), Brink
patent: 3507444 (1970-04-01), Werby
patent: 3588456 (1971-06-01), McNabb
patent: 3777971 (1973-12-01), Steidinger
patent: 3899127 (1975-08-01), Melander
patent: 4640030 (1987-02-01), Wood et al.

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