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:
Sep. 17, 1996
Filed:
Dec. 22, 1994
Pieter C Ooms, Roosendaal, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An electric lamp has a tubular discharge vessel or a lamp envelope with an optically active layer of a material at an inner surface. The optically active layer has window in which the layer is absent. The material of the optically active layer adjacent both to the window and to the wall of the discharge vessel has a form different from that of portions of the optically active layer not adjoining the window as a result of fusion. The lamp may be readily manufactured by a method according to the invention whereby the material situated within the window to be formed is removed by intensive electromagnetic radiation which is directed through the wall of the discharge vessel at the material to be removed.