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:
Oct. 07, 2008
Filed:
Dec. 18, 2003
Applicants:
Seiji Ishida, Hitachi, JP;
Atsuhiko Nakamura, Yachiyo, JP;
Inventors:
Seiji Ishida, Hitachi, JP;
Atsuhiko Nakamura, Yachiyo, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Chiba-Shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 9/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A pulse width modulation method has the steps of operating a second instruction signal so that each of the differences between two or three arbitrary instruction signals in three first instruction signals may become more than the predetermined value, and modulating in pulse width based on the second instruction signal.