Measuring and testing – Fluid pressure gauge
Reexamination Certificate
2008-05-13
2008-05-13
Allen, Andre J. (Department: 2855)
Measuring and testing
Fluid pressure gauge
C125S011020
Reexamination Certificate
active
07370535
ABSTRACT:
An oscillation-type state measuring apparatus has an oscillation-type sensor, a reference oscillation signal generating circuit for producing reference oscillation signals, a beat signal generating circuit for generating beat signals having a beat frequency by synthesizing the sensor oscillation signals and the reference oscillation signals, a counter for measuring a period of the beat signals, and a physical quantity calculation circuit for calculating a physical quantity from the period of the beat signals and from the period of the reference oscillation signals. The reference oscillation signal generating circuit varies the frequency of the reference oscillation signals, and the physical quantity calculation circuit calculates the physical quantity based on the varied period of the reference oscillation signals.
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U.S. Appl. No. 11/485,381, filed Jul. 2006, Sugino et al.
Amano Noriyasu
Sugino Masayoshi
Takakura Shinsuke
Allen Andre J.
Denso Corporation
Nippon Soken Inc.
Nixon & Vanderhye P.C.
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