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. 12, 1977
Filed:
Feb. 24, 1976
Applicant:
Inventors:
Hirotoshi Shirasu, Yokohama, JA;
Hidetaka Yamashita, Kamakura, JA;
Tatsumasa Oonuma, Yokohama, JA;
Takeshi Fukuhara, Fujisawa, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04Q / ;
U.S. Cl.
CPC ...
179 / ;
Abstract
A current supply system for terminal devices in which the line circuits are divided into groups in accordance with the line impedance thereof between an exchange or switching network and respective terminal devices or telephone sets, and a different voltage is applied to respective groups of line circuits which corresponds to the current matching the line impedance for the respective groups of line circuits.