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:
Feb. 06, 1979
Filed:
Jul. 16, 1976
Nils Harmsen, Bruchkobel, DE;
Horst Markhof, Bruchkobel, DE;
Walter Reichelt, Hanau, DE;
Klaus-Ludwig Schiff, Bruchkobel, DE;
Horst Thiede, Bruchkobel, DE;
W. C. Heraeus GmbH, Hanau am Main, DE;
Abstract
To provide low contact resistance, long life, and resistance against tarnishing under corrosive, particularly sulfur atmospheres, a substrate carrier has a layer of palladium applied thereto, of a thickness between 0.5 and 5 .mu.m, preferably between 1 and 3 .mu.m, to which a coating of gold is applied which is porous and has a thickness of only between 0.05 .mu.m and 0.1 .mu.m; the porous gold coating forms islands of gold on the palladium which, in use and as the terminal is wiped against a counter element, smears over the palladium, thus effectively covering the palladium, preventing tarnishing, and maintaining low contact resistance throughout the useful life of the terminal element.