Water pressure posthole digger
CA 2270264 A1 · Owner: Sikes, Jared A. · Inventors: Sikes, Jared A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water pressure operated posthole digging tool. The tool includes a vertically elongate pipe with an enlarged mandrel member having a generally circular cross section mounted on its lower end, and means for connecting the upper end of the conduit to a source of water pressure. The water pressure is discharged through an open end at the bottom of the mandrel. member, so that soil is dislodged at the bottom of the posthole bore. The flow of water then passes upwardly through the annular cavity around the sides of the mandrel member so as to scour out of the sides of the bore. The lower end of the mandrel member is tapered so as to accelerate the flow of water as this passes into the annular …
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 April 27, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2021.
- 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.