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:
Apr. 22, 2014
Filed:
Jul. 05, 2012
Charles Guthrie, San Jose, CA (US);
Edwin Charles Odell, Leicester, GB;
Robin Devonshire, Sheffield, GB;
Donald Wilson, San Jose, CA (US);
Floyd Pothoven, Lakewood, CA (US);
Charles Guthrie, San Jose, CA (US);
Edwin Charles Odell, Leicester, GB;
Robin Devonshire, Sheffield, GB;
Donald Wilson, San Jose, CA (US);
Floyd Pothoven, Lakewood, CA (US);
Ceravision Limited, Milton Keynes, GB;
Abstract
The manufacture of an electrodeless bulb involves one end of a tube closed off, and a first neck is formed in the tube close to the closed end. A second neck is formed in the tube, close to the still open end; a metal halide pellet of known size is dropped into the tube and the tube is evacuated. With the vacuum being maintained heat is applied to the closed end, causing the metal halide pellet to sublime and with it the impurities. The impurities are drawn off, the vacuum being maintained and the metal halide condenses in the tube between the necks. Once the tube is cool, the evacuation is discontinued and the tube is refilled with noble gas and the quartz tube is sealed off at the second neck.