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. 06, 1990
Filed:
Apr. 07, 1989
Applicant:
Inventor:
Friedrich Sernetz, Pforzheim, DE;
Assignee:
Dentaurum J.P. Winkelstroeter KG, Ispringen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264-12 ; 264 63 ; 264 66 ;
Abstract
A method for the production of shaped bodies of transparent polycrystalline alumina having a yellowish color tone. A green body is formed using pure, fine-grained alumina. The auxiliary agents are burned out of the green body. The green body is treated in such a way as to produce a closed surface on the shaped body. The body is compacted to a transparent, polycrystalline alumina body. Finally, the body is annealed in air to impart a yellowish color tone to the body.