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:
May. 14, 1985
Filed:
Aug. 24, 1981
Applicant:
Inventors:
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Engineering Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; H04J / ;
U.S. Cl.
CPC ...
364200 ; 370 86 ; 34082505 ;
Abstract
A symmetric type loop communication system having no master station, in which a plurality of control stations connected to a loop communication path each have a timer with its set time different from each other control station. The timer of a station is reset when a transmission right signal (GA signal) from another control station is received. On the other hand, a GA signal is sent out to another control station together with a message frame when the timer thereof has counted to a predetermined state.