Tie plate
CA 2445491 C · Owner: Mospan, John W. · Inventors: Urmson, W. Thomas Jr.; Mospan, John W.; Downey, John M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrically-insulated tie plate for electrically isolating parts of a railroad , rail system from each other. The electrically-insulated tie plate includes a base plate having a , recessed area for receiving a railroad rail and a layer of electricallyinsulating material , covering portions of the base plate.
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 October 17, 2003 and granted June 14, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2025.
- 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.