Reversible disc plough
CA 1092411 A · Owner: Allen, William S. · Inventors: Allen, William S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reversible multi-disk plow of the type having a main frame connected, at its front, to the three point lifting system of a tractor. A beam is pivoted to the main frame about a verticalaxis for swinging movement to right and left hand ploughing positions. A rear or furrow wheel are provided at the rear of the beam, and a number of hangers for plow disks are pivoted about vertical axes to the beam. The hangers are mounted for simultaneously pivoting automatically, relative to the beam when the, beam is swung to either of its said positions. A pivot connectis the main frame to the mounting means for pivotal movement of the main frame about a substantially vertical axis relative 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
- Granted December 30, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 30, 1997.
- 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.