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. 13, 1984
Filed:
May. 28, 1981
William R Kelly, Lancaster, PA (US);
Ernesto J Alvero, Lancaster, PA (US);
RCA Corporation, Princeton, NJ (US);
Abstract
The light intensity-exposure time product of a lighthouse used in the manufacture of phosphor screens for color picture tubes is held constant despite changes in the shadow mask light transmission characteristic and power supply variations. The power provided to the exposing lamp is monitored and converted to a square wave output having a frequency which varies with the power. The frequency variations change the exposure time inversely with the frequency changes to maintain the light intensity-exposure time product constant.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile