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:
Dec. 14, 1976
Filed:
Apr. 30, 1975
Harold Feldman, Skokie, IL (US);
Dynascan Corporation, Chicago, IL (US);
Abstract
The cathode material of a black and white or color cathode ray tube is rejuvenated by apparatus and a method which initially supplies heater voltage to the heater filament prior to the application of a source of positive voltage between the control grid and the cathode, to pre-heat the cathode to a rejuvenation temperature effective upon flow of appreciable cathode current to rejuvenate the cathode material. Then, upon operation of a depressible push-button a source of positive voltage is connected between the control grid and the cathode to effect said flow of appreciable cathode current and the simultaneous removal of the heater filament voltage from the heater filament, so that the time interval of large cathode current flow depends solely upon the thermal characteristics of the cathode structure.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile