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:
Jul. 18, 1989
Filed:
Apr. 21, 1988
Applicant:
Inventors:
Kunio Suzuki, Hamamatsu, JP;
Toshiharu Hoshi, Hamamatsu, JP;
Assignee:
Yamaha Corporation, , JP;
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
29594 ; 295272 ; 181167 ; 423445 ; 423448 ; 423458 ;
Abstract
In production of a diaphragm for acoustic appliances, a thin metal layer is formed on a substrate by means of vapor phase development so that the density of the product should be high enough for generating high sound pressure even in the high frequency range.