Percussive drill with adjustable flow control
CA 2530040 C · Owner: White, Jeffrey P. · Inventors: Lay, Warren Thomas; Lyon, Leland H.; White, Jeffrey P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluid channeling device is for a percussive drill including a casing having an interior space, drive and valve chambers defined within the interior space a piston disposed within the casing and having an upper end disposable within the drive chamber and a longitudinal through-~bore and a valve for , controlling flow into the drive chamber. The device includes a first member partially disposed within the drive chamber so as to extend into the piston bore when the piston end is within the drive chamber. The first member has an outer surface, an interior space and one or more ports extending between the outer surface and interior space and fluidly connectable with the drive chamber. A …
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 June 18, 2004 and granted May 22, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2026.
- 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.