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. 10, 2010
Filed:
Aug. 11, 2009
Seiichiro Kinugasa, Tokyo, JP;
Seiichiro Kinugasa, Tokyo, JP;
Yamatake Corporation, Tokyo, JP;
Abstract
A differential pressure measuring system includes a light source for emitting a light, a first transducer for attenuating the intensity of the emitted light in a first range, depending on a first pressure, and providing a first light, a second transducer for attenuating the intensity of the first light in a second range, depending on a second pressure, and providing a second light, a feedback circuit for adjusting the intensity of the emitted light to maintain the intensity of the second light in the second range constant, and a measuring module for measuring a differential pressure between the first and second pressures, based on the intensities of the second light in the first and second ranges.