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:
May. 22, 2001
Filed:
Jun. 30, 1998
Hiromi Wakasono, Hyogo, JP;
Matsushita Electronics Corporation, Osaka, JP;
Abstract
A light quantity correction filter that can implement the desired transmittance distribution precisely and easily without complicating an exposure system, a method of making the light quantity correction filter, and a method of manufacturing a color cathode ray tube using the light quantity correction filter are provided. The method of making the light quantity correction filter comprises providing in an evacuated container an evaporation source, a transparent substrate on which material from the evaporation source is to be deposited to form a light quantity correction filter and an evaporation amount distribution controlling sheet that has a plurality of openings and is disposed between the evaporation source and the transparent substrate, evaporating material from the evaporation source for deposition on the transparent substrate, and controlling the amount of evaporated material deposited on the transparent substrate with the distribution controlling sheet to provide a desired transmittance distribution of evaporated material on the transparent substrate.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile