Agricultural chemical distributor
CA 2107096 C · Owner: Redway, Graham John · Inventors: Redway, Graham John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An agricultural chemical distributor provided with a freely rotatable shroud (12) carried by a bearing (25) from a frame (11) and being povided with a generally circular peripheral skirt (30) of readily deformable material arranged to terminate close to the ground and being of sufficient diameter that the shroud (12) is readily rotated upon engagement with a stem or trunk of a vine , bush or tree. Within the shroud there is provided a spray head (34) capable of spraying a weedicide in droplets which are between 40 and 150 microns, the shroud inhibiting overspray of said droplets.
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 February 11, 1993 and granted May 6, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 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.