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. 07, 1992
Filed:
Jan. 18, 1991
Applicant:
Inventors:
James E Huebler, Brookfield, IL (US);
Bruce K Campbell, Chicago, IL (US);
Assignee:
Southern California Gas Company, Los Angeles, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01S / ;
U.S. Cl.
CPC ...
73584 ; 73597 ; 73 4 / ;
Abstract
A method for determining the location of a concealed pipe is disclosed. An identifiable acoustic signal is injected into the concealed pipe. The signal propagates along the interior length of the pipe. The signal is detected by an array of detectors positioned at varying distances from the pipe. The detected signal generates voltage outputs from the detectors to a signal processor. The 'time-of-flight' of the acoustic signal from the point of generation to the point of detection is measured by the signal processor. The detector measuring the shortest 'time-of-flight' is closest to the concealed pipe.