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:
Jan. 20, 1998
Filed:
Jun. 25, 1996
Applicant:
Inventors:
Robert A Ross, Charlottesville, VA (US);
James J Kauzlarich, Charlottesville, VA (US);
Assignee:
University of Virginia Patent Foundation, Charlottesville, VA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 5424 ; 73 5426 ;
Abstract
An electronic viscometer having a vibrating drive in a hollow probe which oscillates along its longitudinal axis and is damped by a sample into which the probe is inserted. The viscometer has a piezoelectric crystal having a feedback electrode, a phase locked loop circuit to track the resonant frequency, drive amplifiers and buffers, and a phase compensation network to ensure that the proper phase relationship is maintained between piezoelectric drive and feedback signals.