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:
Mar. 27, 1984
Filed:
Dec. 28, 1981
Applicant:
Inventor:
John M Reynard, Framingham, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
1791 / ; 1791 / ; 179106 ;
Abstract
The energy storage and transmission capabilities of a capacitance-type electroacoustical transducer are increased and the cost of producing such a transducer can be decreased by employing a thin, dielectric coating material between the electrically conductive diaphragm and backplate of said transducer, and by locating the electrically conductive diaphragm support layer on what would otherwise be an exposed outer diaphragm surface to protect same from physical as well as environmental damage.