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:
Oct. 04, 1977
Filed:
Apr. 04, 1975
Applicant:
Inventors:
Fumio Hosomi, Moriguchi, JA;
Kiyotaka Wasa, Nara, JA;
Shigeru Eayakawa, Hirakata, JA;
Takeshi Nagai, Neyagawa, JA;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
358128 ; 1791 / ; 1791 / ; 274 38 ; 2041 / ; 338176 ;
Abstract
An alumina body having a conductive coating with a smooth surface, is made up of a conductive layer and a cementing layer sandwiched between the conductive layer and the surface of the alumina. The thus coated alumina body can advantageously be used e.g. for a pickup stylus for a video disc playback system of the capacitance variation type.