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. 17, 2001
Filed:
Apr. 02, 1999
John R. Vig, Colts Neck, NJ (US);
Arthur Ballato, Oceanport, NJ (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
Techniques for determining the properties of a liquid include placing one or more acoustic crystal resonators in contact with the fluid. An oscillator circuit drives each of the resonators at one or more different modes. A frequency counter connected to the oscillator monitors the operating frequencies of the resonators before and after the surfaces are placed in contact with the liquid. A computer, which is responsive to the outputs of the frequency counter, includes a liquid property system for determining difference frequencies by comparing the operating frequencies measured by the frequency counter with predetermined reference frequencies. The computer calculates the properties of the liquid from the difference frequencies.