Train tunnel ventilation method and apparatus
CA 1047824 A · Owner: Southern Pacific Transportation Company · Inventors: Jaekle, William M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A train tunnel is ventilated by closing an exit end of the tunnel as a train approaches the entrance end so that, during passage through the tunnel the train acts as a loose piston moving through a long closed cylinder to cause a rapid, airflow rearwardly around the train. -1-
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
- Granted February 6, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 1996.
- 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.