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:
Oct. 16, 1979
Filed:
Jul. 17, 1978
Applicant:
Inventor:
Robert P Hunt, Menlo Park, CA (US);
Assignee:
Diagnostic Information, Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05G / ;
U.S. Cl.
CPC ...
250355 ; 250409 ;
Abstract
An apparatus and method for controlling an X-ray generator in order to obtain a relatively constant output window brightness from a directly viewed X-ray image intensifier tube by introducing a small sinusoidal variation to the bias supply of the image intensifier tube and detecting only the resultantly modulated light component output from the phosphor display screen, the error signal thus derived being independent of dark current and power frequency components common to X-ray generated light output of the image intensifier tube.