Slackless railcar connections with extractable wedge
CA 2035640 C · Owner: Amsted Industries Incorporated · Inventors: Altherr, Russell G.; Kaufhold, Horst T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gravity wedge shim includes a cavity and aperture at the top thereof and a lifting tool is extended through an opening in a sill ceiling above the wedge, inserted into the aperture and twisted so as to engage the wedge for lifting same.
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 February 4, 1991 and granted July 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2013.
- 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.