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:
Dec. 24, 1996
Filed:
Dec. 27, 1995
Thomas G Parham, Gates Mills, OH (US);
Frederick W Dynys, Chagrin Falls, OH (US);
Carl V Gunter, Twinsburg, OH (US);
John M Davenport, Lyndhurst, OH (US);
Thomas M Golz, Willoughby Hills, OH (US);
Rolf S Bergman, Cleveland Heights, OH (US);
Frederic F Ahlgren, Euclid, OH (US);
Gary R Allen, Chesterland, OH (US);
Mark E Duffy, Shaker Heights, OH (US);
Richard L Hansler, Pepper Pike, OH (US);
General Electric Company, Schenectady, NY (US);
Abstract
An interference filter or coating is provided in a predetermined pattern on a lamp envelope. The coating is comprised of alternating layers of high and low index of refraction materials applied to a vitreous outer surface of a lamp envelope. The coating may be geometrically symmetric or asymmetric, continuous or discontinuous with respect to the coating itself or the envelope to which it has been applied. The envelope can be masked prior to deposition of the coating so that removal of the mask leaves the filter in the desired pattern. The preferred process for forming the coating includes forming a boric oxide mask on a portion of the envelope, applying the coating over the mask and removing the coating from masked areas of the envelope by dissolving the mask in an aqueous solution.