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:
Jan. 02, 1979
Filed:
Mar. 10, 1977
Applicant:
Inventor:
Herman F van Heek, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354-1 ; 96 361 ; 313408 ; 355 71 ;
Abstract
An exposure device for the manufacture of display screens of color television display tubes is disclosed comprising a filter of non-uniform transmittance which includes a transparent plate provided with a large number of parallel opaque linear regions. The transmission of the filter is varied by varying the width of the linear regions.