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:
Nov. 04, 2003
Filed:
Mar. 27, 2001
Applicant:
Inventors:
Mitsuru Kurashina, Nagoya, JP;
Michio Asai, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/900 ; C04B 3/500 ; C04B 3/5101 ; B32B 1/00 ;
U.S. Cl.
CPC ...
H01J 1/900 ; C04B 3/500 ; C04B 3/5101 ; B32B 1/00 ;
Abstract
An arc tube is formed by polycrystalline alumina so that an average crystal grain diameter of a surface is two to ten times as large as an average crystal grain diameter of an inside including a center line of a thickness and the average crystal grain diameter on the center portion of the thickness is 10 &mgr;m to 100 &mgr;m. As a result, in the arc tube, the total transmittance is 98%, and a linear ray transmittance is 5%.
Kurashina, Mitsuru. (2003). Corrosion-resistant alumina member and arc tube for high-intensity discharge lamp (U.S. Patent No. 6642656). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6642656
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile