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:
Apr. 27, 1993
Filed:
Sep. 04, 1990
Jau-Ho Jean, Export, PA (US);
Tapan K Gupta, Monroeville, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
A glass-ceramic composition for forming a glass-ceramic dielectric body having a dielectric constant of less than about 4.5, a firing temperature of less than about 950.degree. C. and a sintered density of greater than 95% theoretical density. The composition is formed from a mixture consisting essentially of finely divided particles of 40-50 vol. % borosilicate glass and 50-60 vol. % cordierite. The borosilicate glass comprises approximately 20-35 wt. % B.sub.2 O.sub.3 and approximately 60-75 wt. % SiO.sub.2. The exact particle size ratio of the cordierite to borosilicate glass that is used will depend on the proportions of the components, the desired fired density and the firing temperature. The mixture is fired at a temperature of less than 1000.degree. C.