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:
Jun. 07, 1977
Filed:
Oct. 22, 1975
Walter G Reichelt, Hanau, DT;
W. C. Heraeus GmbH, Hanau am Main, DT;
Abstract
On an aluminum oxide or high-alumina ceramic substrate an intermediate layer of a rare earth, titanium or iron oxide or a mixture of such oxides is provided for matching the thermal expansion coefficient of the substrate to that of a platinum layer between 0.1 and 10 .mu. m thick applied in a resistor pattern configuration on the surface of the intermediate layer. The intermediate layer, unlike a glass embedding layer, allows heat treatment of the platinum layer by heating the entire structure makes it possible to avoid the embedding to heal local defects, without impairing the integrity of the structure (which occur when glass melt) and without co-crystallizing with aluminum oxide. The platinum layer thickness is consistent with stability of the specific resistance and the temperature coefficient of resistance.