Hydraulic hammer
CA 2048374 A1 · Owner: Gien, Bernard L. · Inventors: Gien, Bernard L.; Gien, Bernard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns hydraulic hammers which have particular but not exclusive application in down-the-hole drills. The basis of the invention is that the hammer assembly includes means for applying intermittent hydraulic pressure on one side of the piston and compressible means for constantly applying pressure to/the opposite side of the piston. In the down-the-hole drill application the compressible means will be a gas and either this gas or the hydraulic fluid used to flush the drill bit.
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 August 2, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2013.
- 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.