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:
Nov. 09, 1993
Filed:
Nov. 20, 1991
Applicant:
Inventors:
Takayuki Asai, Tokyo, JP;
Kuniaki Koga, Shizuoka, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340388 ; 340393 ; 340394 ; 3403111 ;
Abstract
A paging receiver provided with a speaker unit including a first resonant box and a second resonant box in order to produce a higher sound pressure without however enlarging a casing of the receiver body is disclosed. The second resonant box is formed made in a hollow space of a mold for fixing a holder to the casing of the paging receiver and is provided with slits to resonate in response to the sound wave outputted from the first resonant box at either input or output portion of the sound wave.