Furrow opening disc apparatus
CA 2265367 C · Owner: Harrison, Fred · Inventors: Harrison, Fred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses a furrow opener apparatus for attachment to an agricultural implement for depositing agricultural material such as seed and fertilizer in the soil. The apparatus comprises a flat disc rotatably attached to the apparatus such its axis of rotation is perpendicular to the direction of travel; a concave disc rotatably attached to the apparatus such that (1) the axis of rotation is perpendicular to the direction of travel, (2) the rear edge of the concave disc is behind the rear edge of the flat disc (3) the concave, side of the concave disc is facing the flat disc and the outer rim of the concave disc is in close proximity to or touching the side of the flat disc; and …
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 March 16, 1999 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2021.
- 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.