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. 07, 2017
Filed:
Jan. 09, 2015
Cambridge Viscosity, Inc., Medford, MA (US);
Janusz Tabis, Winchester, MA (US);
Peter O'Shea, Medford, MA (US);
Daniel A. Airey, Woburn, MA (US);
Viachaslau Urvantsau, Fontenay le Marmion, FR;
Cambridge Viscosity, Inc., Medford, MA (US);
Abstract
A high precision, reciprocating bob viscometer is shown that has two coils (A and B) encircling a reciprocating bob. Coil A is energized with a combined sinusoidal and DC signal, while coil B senses the position of the reciprocating bob, then the functions of coils A and B are reversed. By use of a large digitally-generated near resonance frequency sinusoidal signal, noise is reduced because there is no need for amplification. The sensed signal amplitude measurement is in the digital time domain instead of through analog amplitude measurements, which further eliminates signal noise. These advancements provide faster, highly accurate, low noise measurements of bob position and velocity to determine fluid/gas viscosity and related properties using a reciprocating bob viscometer. These related properties include measurements of density, shear sensitivity, yield stress, and other measurements described in prior art patents.