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. 14, 1990
Filed:
Aug. 15, 1989
Shinji Yagawara, Yokohama, JP;
Wasaburo Ohta, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A flow velocity sensor comprises a base, a first elongating member extending above the base and defined with a first edge at a downstream end thereof, a first heating device provided on the first elongating member along the first edge, a first heat detector provided on the first elongating member in a vicinity of the first heating device at a side away from the first edge and comprising a first metal oxide which absorbs oxygen when heated, desorbs oxygen when cooled, and changes resistivity responsive to adsorption and desorption of oxygen, a second elongating member extending above the base at a downstream side of the first elongating member and having a second edge at an upstream end thereof such that the second edge is substantially aligned with the first edge in a flow direction, a second heating device provided on the second elongating member along the second edge, and a second heat detector provided on the second elongating member in a vicinity of the second heating device at a side away from the second heating means and comprising a second metal oxide which absorbs oxygen when cooled, desorbs oxygen when heated, and changes resistivity responsive to adsorption and desorption of oxygen.