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, 1976
Filed:
Oct. 23, 1974
Gerald Lance Schlatter, Boulder, CO (US);
Charles Eveleigh Miller, Boulder, CO (US);
International Telephone and Telegraph Corporation, New York, NY (US);
Abstract
Apparatus for producing a digital or analog output directly proportional to the ratio of the densities of two gases at the same temperature and pressure. The ratio is usually that of the density of a gas of interest to the density of air. One outstanding feature of this instrument resides in the use of an automatic DC current control for gas and air vibrating ferromagnetic vanes which unexpectedly provides temperature compensation. The gas vane is immersed in the gas. The air vane is immersed in air. Gas and air piezoelectrical crystals for the respective gas and air vanes produce output signals of frequencies corresponding to the vibrational frequencies of the respective gas and air vanes. In combination with other gear, phase lock loops adapted for frequency multiplication are employed and advantageously improve accuracy. Substantial economy is surprisingly achieved in solving the equation. Still another feature resides in the equipment saving involved in time sharing two long counters. It is striking that the gravity of a fluid has been found to be directly proportional to either one of the following two expressions: