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:
Sep. 05, 1995
Filed:
Jan. 07, 1994
Applicant:
Inventor:
Jeffrey R Owen, Portland, OR (US);
Assignees:
Seiko Corporation, both of, JP;
Seiko Epson Corporation, both of, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04C / ;
U.S. Cl.
CPC ...
368 47 ; 368 55 ;
Abstract
A highly accurate time keeping device and time keeping system are disclosed. Time of day information is periodically sent to a wristwatch via radio signal. The time of day as displayed by the watch is updated periodically using the radio signal data and maintained between such periodic updates according to an algorithm of the present invention. The disclosed time keeping system thereby maintains a plurality of time keeping devices in substantially exact synchronization over an extended period.