3741631 is referenced by 23 patents and cites 1 patents.

The described invention makes use of at least two screens which have complementary transparent and opaque patterns and which are relatively movable towards and away from each other so that when adjacent they obturate radiation and when separated they pass it. Thus radiation, for example upon a plant-cultivation area or into a green house, is controllable. Selective filtration may be used to control selected parts of the spectrum. The operation is preferably by inflating and deflating spaces between the screens at least one of which is pliable.

Radiation incidence control means
Application Number
Publication Number
Application Date
March 11, 1971
Publication Date
June 26, 1973
Laing Nikolaus
G02f 01/30
A01G 13/04
E06B 09/24
A01G 09/14
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