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. 15, 1997
Filed:
Aug. 08, 1994
Applicant:
Inventor:
Shigeru Koizumi, Urawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ;
U.S. Cl.
CPC ...
379373 ; 379413 ; 37910016 ;
Abstract
A communication apparatus includes a DC power supplying unit for supplying a DC power to the apparatus, the DC power supplying unit containing a calling signal generating unit for generating a calling signal; a control unit for outputting a control signal to control said DC power supplying unit; and a conversion unit for electrically-isolating supplying the control signal outputted from said control unit to the calling signal generating unit.