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:
Jun. 22, 1976
Filed:
Nov. 13, 1973
Hans Dignus Duinker, Eindhoven, NL;
Cornelis Johannes Schoot, Eindhoven, NL;
Gerardus Antonius Vermeulen, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In the manufacture of screens for cathode-ray tubes, a substantial part of the screens being covered with a non-reflecting substance, hardened polyvinyl alcohol dots of relatively small diameter should be obtained by exposure via a mask with relatively large holes. Owing to an inadequate gradient of the photosensitive polyvinyl alcohol it is not possible to obtain dots of uniform size. The invention enables well-defined, uniform dots to be obtained by superposing a substance on the photosensitive layer which absorbs the light used during exposure, thereby decomposing into substances which do not or not substantially absorb this light. Thus, the effective gradient of the photosensitive polyvinyl alcohol is increased.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile