Seed metering device
CA 2379078 C · Owner: Lempriere, Noel D. · Inventors: Lempriere, Noel D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A seed metering device includes a roller nip for mounting beneath a seed reservoir. The nip is formed by first and second opposed facing nip forming surfaces mounted beneath and aligned with, the reservoir wherein the first nip forming surface is a radially-outer surface of a soft resilient roller. The roller is rotatable by a roller drive in a first rotational direction so as to draw down through the nip by frictional engagement of the seeds in the nip with the surface of the resilient roller seeds falling into the nip. The nip is an elongate curved, thin wedge-shaped nip providing an increased dwell time for seeds being compressed in the nip.
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 26, 2002 and granted June 7, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2024.
- 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.