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:
Aug. 23, 1977
Filed:
Jul. 18, 1975
Otto Holzinger, Munich, DT;
Wilhelm Pross, Munich, DT;
Carl Zeiss Stiftung, Heidenheim (Brenz), DT;
Abstract
A photometer for measuring the light transparency of a substance. A light beam is provided for illuminating a substance, which light beam passes through the substance and strikes a photoelement and produces a measuring current. The voltage generated from the measuring current is logarithmated by a converter circuit and is supplied to an indicating instrument for indicating a measured value. A zero balance control circuit is provided for controlling the voltage applied to the indicating instrument so that the indicating instrument will return to a value determined by a previous measuring of a calibrated substance. If the transparency of the measured substance is identical to the transparency of the calibrated substance, the indicating device will return to a zero value. A value other than zero will indicate the difference in transparency of the measured substance from the calibrated substance.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile