Plow lock
CA 1253003 A · Owner: Knowlton, Leland P. · Inventors: Knowlton, Leland P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Coupling for a plow comprising a pair of mounting, tabs which are fixed to the rearward ends of a pair of arms which form part of a supporting frame for a plow. Each tab comprises a flat plate which includes an opening at the rear edge, a first slot which extends forwardly from the opening and which terminates in a forward edge and a second slot which extends rearwardly from the forward end of the first slot and which terminates in a rearward edge. The opening is adapted to receive a connecting pin of a push beam which is attached to the plow vehicle. The first slot is adapted to receive the pin, so that the pin rests against the forward edge when the plow is pushed forwardly by the plow …
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 April 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2006.
- 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.