Light absorbers
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 26, 1986
Grant Date -
N/A
app pub date -
Aug 13, 1984
filing date -
Aug 12, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light absorber for use in a sampling tube used with sensitive optical pollution detectors the light absorber including a central light receiving conical surface inclined by at least one annular truncated conical surface to provide at least one annular groove or valley surrounding the central cone and wherein one wall of the groove or valley is undercut to shade the base of the groove or valley from direct impinging light.
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