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. 18, 1976
Filed:
Jul. 29, 1974
Applicant:
Inventor:
Thomas H Elmer, Corning, NY (US);
Assignee:
Corning Glass Works, Corning, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; B32B / ;
U.S. Cl.
CPC ...
428220 ; 65 33 ; 106 396 ; 106 / ; 106 48 ; 2524 / ; 252450 ; 428116 ; 428332 ; 428338 ; 156-7 ; 156 24 ; 156 25 ;
Abstract
Ultra-low expansion ceramic articles, having average linear coefficients of thermal expansion below about 5.4 .times. 10.sup.-.sup.7 /.degree.C over the range from room temperature to 1000.degree.C, are produced by removal of MgO and Al.sub.2 O.sub.3 from cordierite articles by acid leaching to produce ceramic articles having oxide compositions in the range of about 55-75% SiO.sub.2, 18-32% Al.sub.2 O.sub.3, and 7-13% MgO which are characterized by the presence of a major amorphous silica-rich phase.