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. 25, 1987
Filed:
Sep. 04, 1986
Applicant:
Inventor:
Yoshihiko Kiyono, Tokyo, JP;
Assignee:
Seiko Instruments & Electronics Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G04F / ; G05B / ;
U.S. Cl.
CPC ...
368157 ; 318696 ;
Abstract
In an electronic analogue timepiece driven by a stepping motor, DC magnetic field detector is connected to the stepping motor to detect the presence of an external DC magnetic field by comparing two induced voltages induced across a motor coil due to free rotation of a motor rotor after each application of two successive drive pulses to the motor coil. A controller is connected to the DC magnetic field detector to control the stepping motor to effect compensation for the detected DC magnetic field.
Kiyono, Yoshihiko. (1987). Electronic analogue timepiece of dc magnetic field detection type (U.S. Patent No. 4688948). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4688948
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile