Railroad car jack
CA 2069729 C · Owner: Spence, Charles · Inventors: Grashoff, William G.; Spence, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A jack for railroad well cars has a frame comprising a central section which fits between the rails and the underside of the car frame. The central section spans the rails and extends somewhat beyond the sides of the car frame. The central frame section connects to a fixed, upright frame section at one end and a pivot section at the other end. The pivot section is movable between a horizontal setup position and a vertical operating position. A lifting beam is mounted on the frame and extends transversely to the car frame. Hydraulic actuators connected between the ends of the lifting beam and the frame are adapted to move the lifting beam between lowered and raised positions. A ratchet and …
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 May 27, 1992 and granted June 10, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2014.
- 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.