Metallic railway sleepers with corrugated ends
CA 1265491 C · Owner: British Steel Corporation · Inventors: Hodgson, William H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
METALLIC RAILWAY SLEEPER WITH CORRUGATED ENDS ABSTRACT OF THE DISCLOSURE:, There is provided a railway sleeper having a formed inverted rolled steel channel-shaped section the ends of which have their upper surfaces downwardly inclined and inwardly tapered over their central region towards the sleeper extremities so as to progressively define at these extremities, in end elevation, a serpentine path having downwardly inclined portions at the side and two further such portions inwardly thereof. The ends of the channelshaped section are press formed and of improved strength and rigidty. The sleeper is of consistent with and continuous form along its entire length.
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, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- 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.