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. 26, 1991
Filed:
Mar. 17, 1989
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Kenwood, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; G10K / ; B29C / ; B05D / ;
U.S. Cl.
CPC ...
428469 ; 428368 ; 428698 ; 428472 ; 428689 ; 428902 ; 427 34 ; 4273763 ; 4273764 ; 264D / ; 264D / ; 264570 ; 264 60 ; 181167 ; 181170 ; 181173 ;
Abstract
A speaker cone plate is provided with an inorganic surfacial hard layer formed at least on a face of a metal substrate and is subjected to a reinforcing treatment by hot isostatic pressing, wherein the surfacial hard layer may be composed of a carbide, an oxide, a borie or a phosphide or may be formed by plasma thermal spraying of an inorganic substance containing silicon nitride whiskers or silicon carbide whiskers.