Tree delimbing device
CA 2302597 C · Owner: Hamby, Thomas E. Jr. · Inventors: Hamby, Thomas E. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for delimbing trees includes two pairs of opposing curved limbstripping , levers including curved cutting blades for engaging and encircling the trunk of a tree to remove limbs therefrom, and a bottom cutting blade positioned to remove, limbs from a lower portion of the tree. The bottom cutting blade is movably mounted, so as to move in response to forces imposed on the bottom cutting blade by a tree, being pulled through the device. In one embodiment the bottom cutting blade , is, vertically movable and is biased upward by a spring device. In another embodiment, the bottom cutting blade is pivotally mounted so as to be pivotable forward and, rearward, and an impact tool is …
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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 March 22, 2000 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2022.
- 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.