Expired Canadian patentCanada
Force matching tree shear
CA 2029829 C · Owner: Hamilton, Douglas D. · Inventors: Hamilton, Douglas D.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tree shear where the shear blade is moved by a power mechanism that includes a link and lever so arranged that the force available matches approximately the force required to pass the shear blade through the tree to sever the same.
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 November 13, 1990 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 13, 1990
GrantedJuly 14, 1998
Term endedNovember 13, 2010
Patent numberCA 2029829 C
Classification (IPC)A01G23/08
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.