Grinding wheel and method for removal of sprues and riser pads from cast railcar wheels
CA 2248773 C · Owner: Simpson, John F. · Inventors: Bendik, Gary W.; Simpson, John F.; Vanlaar, Brian L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An abrasive material grinding wheel for grinding the plate front face of an as-cast railroad wheel to remove sprues and riser pads has a projecting and leading edge to extend the ground surface into close proximity to a hub and fillet section of the railroad wheel which grinding wheel has a reduced wall thickness a recess for receiving a retaining flange to reduce the elements extending from the outer face of the grinding wheel and a sloped outer grinding surface projecting the leading edge and providing a grinding-wheel surface adequate to grind the entire riser pad from the plate front surface between the wheel rim and the front hub fillet and to generally retain the grinding wheel outer …
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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 October 23, 1998 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2020.
- 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.