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. 03, 1996
Filed:
Aug. 03, 1994
Applicant:
Inventors:
Junji Manaka, Tokyo, JP;
Tetsuo Ishibashi, Tokyo, JP;
Assignee:
Ricoh Seiki Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ; G01F / ; G01N / ;
U.S. Cl.
CPC ...
73 3101 ; 73 2901 ; 73 75 ; 7320411 ; 73 2504 ; 340634 ;
Abstract
A low-cost and quick-response type gas-density sensing element is free from positioning error of sensing ambient temperature and gas density and can accurately sense the gas flow even if the environmental conditions sharply change. An output voltage V.sub.1 proportional to an ambient temperature is obtained by heating a sensing element at low temperature and an output voltage V.sub.2 proportional to the ambient temperature and humidity is obtained by heating the sensing element at a high temperature. An output voltage which is proportional to the humidity is obtained by subtracting the voltage value V.sub.1 from the voltage value V.sub.2.