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:
Feb. 09, 1988
Filed:
Aug. 05, 1985
Applicant:
Inventors:
Dean P Perkins, Pasadena, TX (US);
Allan H Mueller, Houston, TX (US);
Assignee:
Geosource, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
367189 ; 73664 ;
Abstract
A method and apparatus for driving a seismic hydraulic vibrator in which a conventional sinusoidal drive signal in modified in such a manner as to improve vibrator response parameters. The sinusoidal drive signal is modified such that in the regions of the signal proximate the reference axis, the signal will abruptly pass from one side of the reference axis to the other side of the reference axis. This modification is accomplished by summing a square wave signal with the sinusoidal signal to form a composite drive signal.