Rotary mower cutter disc having replaceable knife mount shield
CA 2228862 C · Owner: Deere & Company · Inventors: Verhulst, Michael Joseph; Rosenbalm, Allan Wesley; Richardson, Craig Allen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a cutter assembly, adapted for rotating about an upright axis passing centrally through the assembly, and including a cutter body having at least one flat blade mounting section extending inwardly from a peripheral location of said body containing a, mounting hole and having upper and lower surfaces and a blade extending outwardly, beyond the peripheral location and being secured to said cutter body by a bolt extending through the blade and said mounting hole and having a nut screwed thereon the, improvement comprising: a shield having a bore aligned with said mounting hole and formed in upper and lower portions respectively engaging said upper and lower surfaces of said mounting section …
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 9, 1998 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2020.
- 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.