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:
Mar. 08, 1977
Filed:
Jan. 22, 1976
John B Farr, Houston, TX (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
A continuous line hydrophone comprising a plurality of coaxial cable segments coupled by electronic circuit modules wherein the coaxial cable serves the functions of seismic detector, signal transmission line, and DC power supply line. In the preferred embodiment, the coaxial cable is sensitized to seismic energy by having the inter-electrode dielectric permanently polarized so that it becomes an electret. An electronic circuit module at the end of a coaxial cable segment responds to seismic frequency signals produced in the coaxial cable by acoustic waves to generate a frequency-modulated carrier wave which is coupled to the next coaxial cable segment for transmission toward a tape recorder. The electronic module also retransmits any carrier wave signals which it receives from cables from distant from the recorder. The electronic circuit means additionally allows DC power to be coupled from the recorder end of the cable to more distant electronic circuits.