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:
Apr. 30, 1991
Filed:
Aug. 03, 1989
Takashi Nishikado, Kawasaki, JP;
Megumu Kondo, Kawasaki, JP;
Kazuhiko Fukuoka, Machida, JP;
Fumiya Murata, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a file management system a plurality of information processing devices are provided with files of tree structure. The information processing devices are linked through a communication line and dispersed files are utilized by a plurality of users in common. Each of the users can construct his own file without having any influence on the others. A table is provided including a column indicating the relation of links for the case where an arbitrary branch of a tree structure, included within at least one information processing device, is linked with a part of files included within another information device and a column specifying groups, for which the relation of links is valid. Linking is only permitted for access demands from members belonging to the group for which the relation of links is indicated as valid, to the part of the files of the other information processing device.