Drill plough
CA 1192448 B · Owner: Amazonen-Werke H. Dreyer · Inventors: Dreyer, Heinz; Wiemeyer, Benno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drill-plough equipped with a frame and hoeing shares arranged to move in an upright frame in share- holders. In a known similar machine the depth of penetration, of the hoeing shares into the ground cannot be kept constant this being due to the fact that the angle of attack of the cutting surfaces of the hoeing shares alters as soon as the share-holders carry out the slightest pivoting movement. Further the known drill-plough can only be used to sow well-prepared fields. To overcome these drawbacks, the present invention provides a drill-plough which prevents the hoeing shares and their holders from being damaged by striking obstacles in the ground in such a manner that the shares rapidly …
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 October 14, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 14, 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.