Post driver
CA 2005611 A1 · Owner: Ubbink, Barney · Inventors: Ubbink, Barney
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A post driver for driving a wedged anchor into the ground wherein said wedged anchor is adapted to receive a post at the top end thereof comprising: an elongated inner shaft having a rectangular cross-section said inner shaft having one end of which is adapted to be received by said wedged anchor; a plate co-extensive with said rectangular cross-section and fixedly secured at said one end of said elongated inner shaft; a hollow elongated outer shaft having spaced first and second open ends; said first open end of the hollow elongated outer shaft adapted to receive another end of the inner shaft for relative slidable movement therebetween; a mass presented at the second open end; aligned …
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 December 14, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 14, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2011.
- 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.