Embedded duplex local control panel
CA 2175518 C · Owner: Westinghouse Air Brake Company · Inventors: Corvin, John H.; Greer, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for controlling the operation of a door comprising a first microprocessor and a second microprocessor each having a plurality of inputs for sensing the status of a vehicle. The plurality of inputs include a no motion trainline input an, open trainline input, an unlock trainline input and a close trainline input. The first microprocessor also has a close grant input for receiving a close grant signal from the second microprocessor while the second microprocessor also has a close request input for receiving a close request signal from the first microprocessor. The system also includes a motor for opening and closing the door and a motor relay circuit device controlled by the …
Read the whole patent
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 May 1, 1996 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2018.
- 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.