Flexible or portable closure – partition – or panel – Plural and/or with rigid closure – Roll type
Patent
1979-01-24
1981-09-22
Smith, Alfred E.
Flexible or portable closure, partition, or panel
Plural and/or with rigid closure
Roll type
160241, 350314, A47G 502, G02B 522
Patent
active
042904730
ABSTRACT:
A device for controlling light transmission through an opening in which a pair of spaced planar parallel films are placed adjacent an opening. The films are selected to have uniformly and linearly varying light transmitting characteristics and are designed to be moved relative to each other, generally in opposite directions, so that a substantially uniform degree of light transmission is achieved over the entire opening area. The films may be either absorptive or reflective and the films may be moved manually or electrically and automatically in response to a sensing and control device.
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patent: 2702081 (1955-02-01), North et al.
patent: 3056626 (1962-10-01), Browne
patent: 3183033 (1965-05-01), Stulbach
patent: 3236290 (1966-02-01), Lueder
patent: 3603672 (1971-09-01), Bastide
patent: 3746429 (1973-07-01), Spindel et al.
Pierson James G.
Wilmshurst David A.
Field Carolyn E.
Queen's University at Kingston
Smith Alfred E.
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