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:
May. 16, 2006
Filed:
Aug. 05, 2002
Parimal J. Patel, Joppa, MD (US);
Gary Gilde, Northeast, MD (US);
James W. Mccauley, Havre De Grace, MD (US);
Parimal J. Patel, Joppa, MD (US);
Gary Gilde, Northeast, MD (US);
James W. McCauley, Havre De Grace, MD (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
A transparent aluminum oxynitride product is produced by a first heat treating step wherein a combination of AlOand AlN at a temperature within the solid-liquid phase and a second step of sintering the heat treated combination at a temperature at least 50° C. less than the heat treating temperature. The method introduces a small fraction of liquid that aids in pore elimination and densification. In a single step, the material is shifted from the liquid/solid region into a solid AlON solution region, wherein the liquid is fully reacted with the solid AlON phase, with further sintering occurring. The procedure is sufficient to eliminate voids and other imperfections which often result in a reduction in optical clarity.