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:
Sep. 03, 1991
Filed:
Jul. 28, 1989
Applicant:
Inventors:
Masato Hirai, Hadano, JP;
Yoshinori Bekki, Hadano, JP;
Sinzi Ikezawa, Hadano, JP;
Teruo Moriguchi, Hadano, JP;
Assignees:
Hitachi, Ltd., Chiyoda, JP;
Hitachi Computer Electronic Co., Ltd., Hadano, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375-4 ; 370 15 ; 370 8512 ;
Abstract
A regenerative repeater for regeneratively repeating a signal to be transmitted is inserted in two ring-like transmission lines, and is provided with loop back means for automatically separating the regenerative repeater from the ring-like transmission lines in the condition that a power supply is in a not-yet-turned-on state, so that closed ring-like transmission lines are formed in the form where the regenerative repeater is removed in the condition that the power supply is in the not-yet-turned-on state.