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:
Dec. 01, 1998
Filed:
Oct. 03, 1995
Applicant:
Inventors:
Hiroyuki Seki, Sendai, JP;
Terumi Hakamada, Sendai, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455 381 ; 455 671 ;
Abstract
Disclosed is a constitution for repeated self-diagnosis of a radio portable device having a two-way radio device alone, in a wireless communication system using DTMF control. By the instruction from the operation unit, output signals of a transmission sound circuit and a transmission DTMF circuit are repeatedly received in a reception sound circuit and a reception DTMF circuit, and the output from the speaker is inspected, thereby diagnosing the circuits.