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:
Feb. 13, 2001
Filed:
Jul. 25, 1997
Toru Setoyama, Fujisawa, JP;
Takanori Miyamoto, Fuchu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A bidirectional communication system in which dial-up connection for transmitting communication data may be disconnected when not used, and may be insured to be reconnected when needed. Also, the system includes an arrangement in which availability of connection with dial-up may be notified/determined in advance. The bidirectional communication system includes a first communication station and one or more second communication stations, the second communication stations receiving information delivery service from the first communication station, and the second communication stations performing data communication with the first communication station by means of dial-up link. The first communication station includes: an assignor assigning to the second communication station a protocol identifier of a network layer; a connector/disconnector for connecting/disconnecting the communication link according to respectively the presence and absence of communication data from the second communication station; and a storage holding the protocol identifier of the network layer assigned to the second communication station during the information delivery service from the second communication station.