Fluid operated ram for felling trees
CA 1078813 A · Owner: Silvey, Elmer R. · Inventors: Silvey, Elmer R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cylinder housing has a piston projecting from one end thereof for forming a longitudinally expandable ram. One end of the cylinder housing has a base and the projecting end of the piston has a head whereby upon engagement of the base of the cylinder and the head of the piston between the top and bottom of a backcut provided in the tree the tree, can be felled by expanding the ram The engaging surface between the, end of the piston and its head comprises a slidable concave-convex surface engagement to allow relative movement of the head on the piston as the tree falls. The head is held on the piston but capable of its relative sliding movement by a resilient cord connected between it and …
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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
- Granted June 3, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 3, 1997.
- 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.