Optical: systems and elements – Glare or unwanted light reduction – With absorption means
Reexamination Certificate
2009-11-09
2011-10-25
Pritchett, Joshua L (Department: 2872)
Optical: systems and elements
Glare or unwanted light reduction
With absorption means
C359S601000
Reexamination Certificate
active
08042958
ABSTRACT:
A protective automatic darkening filter (ADF) includes automatic power management capabilities. The ADF includes a power management control unit that controls power to the ADF based on whether or not the ADF is currently in use. In one embodiment, to determine whether the ADF is in use, the power management control unit includes a motion sensor that senses movement of the ADF and controls power to the ADF based on the sensed movement.
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Automatic Welding Filters—A Decade of Changes, Welding and Metal Fabrication, IPC Ltd., Haywards Heath, GB, vol. 61, No. 8, Oct. 1, 1993.
3M Innovative Properties Company
Pritchett Joshua L
Van Vliet Emily M.
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