Bottom discharge hopper structures
CA 1108473 A · Owner: Rotaque (Proprietary) Limited · Inventors: Brouwer, Cornelis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hopper car structure having a hopper body with a discharge opening at the bottom. A pivotally hung door having an arcuate base plate normally closes said opening and an arm is pivotally mounted on the door. A roller is carried by the arm on its free end and is intended to engage a ramp. The arm, in the closed condition of the door, has an abutment surface thereof spaced downwardly from an abutment surface of the door. When said roller engages an upwardly inclined ramp, the arm pivots upwardly with respect to the door until the abutment surface of the arm engages the abutment surface of the door. The door and arm then swing together about the pivotal mountings of the door to the open …
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 September 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 1998.
- 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.