System for discharge of bulk materials from vehicles
CA 2070542 C · Owner: Edi Rail Pty Ltd · Inventors: Kwok, Alexander King Wai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for operating hopper doors 14 16 in a bulk, transport vehicle comprises a pair of linkages 34 36, 38, 40 forming an over-center locking arrangement and separate opening and closing trip levers 24 50, attached to an operating shaft 30. The trip levers 24, 50 are operated by engaging associated cams 24 54, as the vehicle is moved relative thereto. A single door or pair of doors may be operated at the same time. To prevent false triggering of the door mechanism in transit, a secondary lock can be provided where a spring or counterweight is used to bias a lever which restrains a governor. The governor moves between stops which determine the angular positions corresponding to the …
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 5, 1992 and granted July 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 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.