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, 1988
Filed:
Feb. 27, 1987
Applicant:
Inventors:
James H Wharton, Indianapolis, IN (US);
Peter D Osman, Indianapolis, IN (US);
Assignee:
RCA Licensing Corporation, Princeton, NJ (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H05B / ;
U.S. Cl.
CPC ...
328270 ; 315 94 ; 315105 ;
Abstract
A video apparatus capable of operating at different line deflection frequencies incorporates a CRT electron gun assembly heater supply voltage circuit that maintains a constant rms voltage level independent of the line deflection frequency. The heater supply includes a transformer winding located on the line deflection driver transformer. The duty cycle of the developed AC voltage waveform remains substantially constant independent of the line deflection frequency, so that the AC voltage may be applied to the heater circuit.