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:
Aug. 24, 1976
Filed:
Aug. 05, 1974
Applicant:
Inventor:
William E Egbert, Sunnyvale, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318331 ; 318341 ; 318345 ;
Abstract
The pulse-width modulated motor speed control circuit described herein includes a binary latch-controlled motor driver, wherein the state of the controlling match is determined by the phase of the drive signal and the level of back emf of the motor when the motor is not being driven.