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. 21, 1991
Filed:
Nov. 15, 1989
Godefridus H Heijnen, Vaals, NL;
Cornelis A Mulder, Eindhoven, NL;
Ernest O Van Der Stelt, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The colored electric lamp has a lamp vessel (1) carrying a colored translucent interference filter (12) of alternately SiO.sub.2 layers and layers of comparatively high refractive index. In the filter, layers of high refractive index have an optical thickness smaller than 1/4.lambda..sub.0, while SiO.sub.2 layers have an optical thickness larger than 1/4.lambda..sub.0. An SiO.sub.2 layer of 500-900 nm thickness can be present on the filter. The light emitted by the lamp has a higher color saturation and the filter has a better adherence to the lamp vessel than in the case of a lamp comprising a conventional filter having an equal overall thickness of layers of high refractive index.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile