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. 02, 1990
Filed:
Feb. 15, 1989
Applicant:
Inventor:
Fujio Tamura, Sendai, JP;
Assignee:
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01L / ;
U.S. Cl.
CPC ...
73755 ;
Abstract
A pressure or vacuum gauge measures pressure of gas within a chamber. A quartz oscillator is disposed within the chamber for undergoing oscillation having a frequency dependent on a body temperature thereof. A constant heat source is disposed in spaced relation to or directly on the temperature-dependent quartz oscillator for heating the same to hold the body temperature thereof which is dependent on the pressure of surrounding gas. The oscillating frequency of the quartz oscillator is converted into a signal indicative of the pressure of the gas.