Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2011-03-01
2011-03-01
Sohn, Seung C (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C348S135000, C374S130000
Reexamination Certificate
active
07897908
ABSTRACT:
A method and device are described for controlling and/or attenuating aiming laser beam brightness in a hand held radiometer. The beam from the laser is directed at a target measurement surface and a transversely movable element member is interposed between the laser and the target to change the beam brightness on the target. In a preferred device a slidable or rotatable element intercepts the beam between the laser and target and a calibrated opening in the element of selected size and/or shape allows part of the beam to pass through the element to provide a safe brightness at the target.
REFERENCES:
patent: 4403251 (1983-09-01), Domarenok et al.
patent: 2005/0029459 (2005-02-01), Gotz et al.
patent: 2006/0114966 (2006-06-01), Kienitz
Drucker William A.
Sohn Seung C
White Box, Inc.
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