Side frame-bolster interface for railcar truck assembly
CA 2276563 C · Owner: Hawthorne, V. Terrey · Inventors: Hawthorne, V. Terrey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interface between the end of a bolster and a side frame column for a threepiece railcar, truck assembly is disclosed. The bolster and side frame have several pairs of facing stop surfaces, at the interface. Each pair of facing stop surfaces are at two different spacings: one spacing is, close, with a small gap between the stop surfaces; another spacing is greater than the first. The, second spacing allows the side frame to pitch with respect to the bolster transverse axis. The, bolster stop surfaces may be the lands inboard and outboard of the friction shoe pockets. The, lands may be shaped so that there is a raised warp control portion or surface and one or more, relief portions …
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 June 25, 1999 and granted March 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2021.
- 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.