Filtering device
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United States of America Patent
Stats
-
Jul 31, 1990
Grant Date -
N/A
app pub date -
May 3, 1989
filing date -
May 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filtering device for use in shutting out a greater portion of the ultraviolet and infrared rays but admitting the passage of visible lights indispensable to the growth of plants and human life, the device including a mixture and a container for holding the mixture, the mixture containing water, a compound dissociable into ferrous salt ions, and at least one of L-ascorbic acid and D-ascorbic acid, the container comprising transparent members disposed face to face with each other, with the mixture confined therebetween.
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International Classification(s)
Cited Art Landscape
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