The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2003
Filed:
Aug. 14, 2001
Applicant:
Inventors:
Hiroshi Kita, Tokyo, JP;
Kenichi Tsuchizaki, Tokyo, JP;
Assignee:
Marumo Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/00 ;
U.S. Cl.
CPC ...
G05F 1/00 ;
Abstract
A dimmer for an incandescent lamp, wherein a phase angle controlling dimmer for performing one time ignition operation every one period of a power supply waveform is used, the ignition angle is varied continuously to perform an optical adjustment operation, each of the electrical powers of positive half cycle and negative half cycle is supplied to individual filaments of a bulb so as to enable an optical adjustment of less variation in color temperature to be attained.