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:
Aug. 24, 1999
Filed:
Oct. 16, 1997
Applicant:
Inventor:
William W Chen, Los Angeles, CA (US);
Assignee:
Raytheon Company, Lexington, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428700 ; 428701 ; 428702 ; 264-121 ; 264-17 ; 264235 ; 264345 ;
Abstract
A large, monolithic sapphire structure for use in mid-IR military applications, such as, for example, a window or screen for radar detection equipment. The structure is made by bonding together two or more smaller sapphire panes by a method including the steps of coating a surface of each of the panes with a magnesia vapor and contacting the magnesia-coated surfaces with each other in the presence of a hydrogen-containing gas at a temperature (e.g., about 1500.degree. C. and 2000.degree. C.) and for a time period (e.g., about 45 minutes to about ten hours) sufficient to form a continuous magnesia-alumina spinel interlayer bond between the panes.