Optics: image projectors – Picture carrier
Patent
1991-11-15
1993-08-17
Cuchlinski, Jr., William A.
Optics: image projectors
Picture carrier
353DIG5, 401592, G03B 2111, F03B 2300
Patent
active
052373550
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 polyester backing having a thickness of from about 5 to about 15 micrometers, and coated on one surface of the backing is an adhesive layer, wherein the tape has a flexibility measurement of about 1.8 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.
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Kiehne Douglas A.
Luthy Kenneth W.
Cuchlinski Jr. William A.
Dowling William C.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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