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:
Mar. 21, 1978
Filed:
Jun. 21, 1976
Applicant:
Inventor:
Park French, Aurora, OH (US);
Assignee:
Sterndent Corporation, Mount Vernon, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ; H01J / ;
U.S. Cl.
CPC ...
356188 ; 2502 / ;
Abstract
An automatic zeroing circuit normalizes a detector-measuring apparatus to eliminate relatively steady-state DC errors that may develop in response to the temperature or other variable parameter dependency of leakage currents in a transducer, such as dark currents in a photosensitive transistor. Therefore, the outputs from such apparatus are generally insensitive to such variables and errors.