Communications system between lan's of different types
CA 2048685 C · Owner: Fujitsu Limited · Inventors: Suga, Takaaki; Morizono, Toshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A communications system between LANs (Local Area Network's) of different types constituted of a backbone LAN (1) and a plurality of branch LANs (7,7') connected to said backbone LAN (1) through a node (2A, 2B 2C, 2D). A branch, LAN frame (30) delivered from a terminal (8 9, 10, 15, 18, 21) is incorporated into a backbone LAN frame (40) in the node (2A, 2B, 2C, 2D), and in response to the incorporation the, address of the adjoining node on the downstream side of its own node is given to the backbone LAN frame (40) and thus, the backbone LAN frame (40) is transmitted through the backbone LAN (1). Each node (2A, 2B, 2C 2D), when the, address in the backbone LAN frame (40) agrees with its own …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 25, 1991 and granted November 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.