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:
Oct. 11, 1988
Filed:
Oct. 01, 1987
Susumu Nakayashiki, Yokohama, JP;
Takeshi Harakawa, Hadano, JP;
Yoshinori Bekki, Hadano, JP;
Hiroyuki Wada, Hadano, JP;
Masahiro Fuse, Hadano, JP;
Hiroshi Nakase, Fujisawa, JP;
Osamu Ebina, Atsugi, JP;
Jiro Kashio, Kawasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A station diagnosis method in a communications network system including a closed ring transmission line and a plurality of data stations which can be connected to the ring transmission line by a plurality of line concentrators disposed in the ring transmission line wherein an internal ring transmission line is formed in the line concentrators so that the operation states of the line concentrators are diagnosed by transmitting diagnosis data through the internal ring transmission line.