Apparatus for controlling light transmission through a window

Details Apparatus for controlling light transmission through a window Apparatus for controlling light transmission through a window

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.

REFERENCES:
patent: 2280358 (1942-04-01), Tietig
patent: 2281022 (1942-04-01), Cavanaugh
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.

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