Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2005-01-04
2008-12-09
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S2140DC
Reexamination Certificate
active
07462806
ABSTRACT:
A dazzle prevention device having an electromagnetic wave detection function is disclosed. The device includes an optical detection means, an electromagnetic wave sensor means, the electromagnetic wave detection means, a control means, and a light transmission control means. The optical detection means detects light generated from the welding or cutting torch. The electromagnetic wave sensor means detects an electromagnetic wave. The electromagnetic wave detection means compares a signal, which is input through the electromagnetic wave sensor means and resonated, with a variably set reference value. The control means applies the electromagnetic wave detection mean drive signal to the electromagnetic wave detection means and monitors the variation of an electromagnetic signal using the output of the electromagnetic wave detection means. The light transmission control means controls the variation of light transmittance of the dazzle prevention plate in response to an output signal from the control means.
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patent: WO 02/49554 (2002-06-01), None
PCT Written Opinion of the International Searching Authority; International Application No. PCT/KR2005/000005; International filing date: Jan. 4, 2005; Date of Mailing: Apr. 27, 2005.
PCT International Search Report; International Application No. PCT/KR2005/000005; International filing date: Jan. 4, 2005; Date of Mailing: Apr. 27, 2005.
Cantor & Colburn LLP
Le Que T
Otos Tech Co., Ltd.
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