Envelope for transparencies

Details Envelope for transparencies Envelope for transparencies

1991-11-15

1993-11-30

Cuchlinski, Jr., William A.

Optics: image projectors

Picture carrier

353DIG5, 401592, G03B 2111, G03B 2164

Patent

active

052669874

ABSTRACT:
An improved envelope for transparencies for overhead projectors comprising a substantially rectangular pocket made of a transparent sheet material, the pocket having two longitudinal side edges connected by shorter side edges, and being open at least along one side edge for insertion of a transparency, at least one opaque flap attached in a foldable manner along one of the side edges by means of a flexible adhesive tape, the tape comprising a flexible polyolefin backing having a thickness of from about 30 micrometers or less, and coated on one surface of the backing is an adhesive layer, wherein the tape has a flexibility measurement of about 2.5 grams, and the flap is capable of remaining in the unfolded position on an overhead projector stage with minimal adhesive transfer at the operating temperature of the overhead projector.

REFERENCES:
patent: 4679923 (1987-07-01), Nielsen

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