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:
Jul. 14, 1981
Filed:
Oct. 10, 1979
Applicant:
Inventors:
John Lowdenslager, Norwalk, CT (US);
Alan E Willis, Stamford, CT (US);
Assignee:
Timex Corporation, Waterbury, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04B / ;
U.S. Cl.
CPC ...
368 11 ; 368 10 ; 7317 / ;
Abstract
A solid state digital watch and barometric pressure indicator having a sealed quartz crystal and a second unsealed quartz crystal which changes frequency with atmospheric pressure changes. The frequency variation of the unsealed quartz crystal is measured over a selected (interrogation) period and some number proportional to the frequency variation, which is indicative of the magnitude of atmospheric pressure change, is displayed with an appropriate sign to indicate increasing or decreasing atmospheric pressure.