Cover for transparencies for use in projectors having a horizont

Details Cover for transparencies for use in projectors having a horizont Cover for transparencies for use in projectors having a horizont

1989-06-06

1990-05-15

Thomas, Alexander S.

Stock material or miscellaneous articles

Sheet facing and longitudinally noncoextensive with web or...

428124, 428136, 428137, 428138, 428194, 40661, 40159, B32B 104, B32B 304

Patent

active

049257200

ABSTRACT:
In a cover (1) for overhead transparencies (not shown) and consisting of a pocket (2) with ring file holes (9) and a non-transparent mask flap (3) to cover the part of the light plate of the projector which is not covered by the pocket (2), the novelty is that the mask flap (3) is hinged to the pocket (2) at the edge which is opposite the edge with the ring file holes (9).
This provides a plurality of advantages, e.g.

REFERENCES:
patent: 4185405 (1980-01-01), Giulie
patent: 4810544 (1989-03-01), Hickman

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