Final grading grid
CA 2215318 C · Owner: Goulet, Luc · Inventors: Goulet, Luc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
With conventional machines, it is necessary to level filling material with a rake after the machine has spread and leveled it in order to remove irregularities. The invention describes a fine-leveling harrow made of metallic tubes forming an angle which can be fitted to any scoop. This harrow is provided with a hydraulic jack and springs so that its position can be changed. When the filling material is dragged the angle- forming tubes channel the filling material towards holes encompassed by the harrow without spilling of the material. In contrast if the harrow is pushed, the filling material is directed towards the sides of the harrow. This device leads to highly uniform leveling of 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 October 28, 1997 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2019.
- 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.