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:
Feb. 14, 1984
Filed:
Jul. 28, 1981
Applicant:
Inventor:
Karl G Hernqvist, Princeton, NJ (US);
Assignee:
RCA Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; F01J / ;
U.S. Cl.
CPC ...
313402 ; 313481 ; 455-2 ; 455 55 ;
Abstract
A structure and method is proposed for eliminating so-called halo-blocked apertures in color picture tubes. The halo-blocked apertures are caused by insulative negatively-charged particles attached to the gas-sorbing conductive getter metal film on the inside surface of the shadow mask which deflect the transmitting portions of an electron beam. The structure comprises a source within the tube for depositing a gas-sorbing conductive getter metal overlay on the charged particle to render the particle conductive so that the particle cannot deflect the beam.