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:
Sep. 09, 2003
Filed:
May. 10, 2001
Applicant:
Inventors:
Thomas R. VanZandt, Redondo Beach, CA (US);
Stephen J. Manion, Altadena, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 1/100 ; G01P 1/513 ;
U.S. Cl.
CPC ...
H04R 1/100 ; G01P 1/513 ;
Abstract
Force-balance feedback geophone apparatus and methods for characterization of the geophone apparatus. Control inputs ( ) provide for switching ( ) of a force-balance feedback geophone between operational states, thereby allowing for in situ determination of geophone characteristics. Feedback circuit modification provides for increased bandwidth and a series RC circuit in the reference resistance provides for increased damping without significantly affecting low frequency performance.