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. 02, 1989
Filed:
Feb. 24, 1988
Applicant:
Inventor:
Simon Balderson, Reading, GB;
Assignee:
Thorn EMI plc, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219543 ; 29612 ;
Abstract
A substrate for supporting electrical components, such as thick film resistive heating elements, comprises a plate member, such as a metallic plate member, coated on one or both of its flat surfaces with a glass ceramic material. It has been found that the problems of (a) electrical breakdown between the metallic plate member and the thick film resistive heating element and (b) lack of adhesion between the thick film and the glass ceramic material can be substantially reduced or eliminated by reducing the porosity of the glass ceramic material. Methods of producing a glass ceramic layer having a low porosity, involving a two-stage heating process, are described.