Intra-train radio communication system
CA 2213764 C · Owner: Westinghouse Air Brake Company · Inventors: Kull, Robert C.; Klemenski, Richard S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio-based system for a train including a lead transceiver unit and multiple remote transceiver units. The lead transceiver unit initiates a command by sending a command message. Each of the remote transceivers receiving the command message transmits a reply message which repeats the command message and contains the status of the sending remote. Remote transceivers not receiving the lead transceiver's transmitted command message but receiving a, reply message from one of the other remote transceivers transmit a reply message containing the remote's status. The lead transceiver detects whether reply messages are received from the remote transceivers and may transmit a request in response. …
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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 August 20, 1997 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2019.
- 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.