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:
Jul. 24, 1979
Filed:
Oct. 21, 1976
Applicant:
Inventor:
Bryce L Fanning, Dartmouth, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
340 10 ; 340-9 ;
Abstract
A hydrophone which provides for cancellation of signals caused by acceleration forces and variations in water pressure head. The structure is comprised of a transducer for sensing an acoustic pressure wave as well as an acceleration force, and an accelerometer, which is isolated from the acoustic pressure wave, for sensing only the acceleration force. The transducer and the accelerometer are connected so as to subtract the acceleration output. Only the acoustic pressure wave output signal remains. Circuitry is also provided for cancelling the pressure head signal.