Improved method and apparatus for sowing seed
CA 2127548 C · Owner: Davidson, Maxwell Wingage · Inventors: Davidson, Maxwell Wingage
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of sowing seed (including fertilised pellets parti-, cles, crystals and the like) comprises accelerating the seed to a speed in the supersonic range and directing the so moving seed to impinge on penetrable sowing ground so that the seed penetrates the ground to approximately the desired depth. The operation is carried out in a relatively low pressure environment and a feature of the operation is that the seed can penetrate the ground without substantial damage to the seed. Appropriate apparatus is provided to accelerate the seed to the supersonic speed range in a low pressure environment, and in one example this comprises a rotor wheel (30) receiving seed appropriately from a …
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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 January 7, 1993 and granted October 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2015.
- 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.