Rock drill
CA 2248697 A1 · Owner: Sig Produktionstechnik Ag · Inventors: Siegenthaler, Max
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The rock drill (9) comprises a reversible rotary motor (10) and a percussion unit (11) with a percussion valve (17). Rotary unit and Percussion unit (11) are operated via separate valves (39, 46) in a control unit (34). The percussion frequency of the percussion unit (11) is coupled to the rotation rate of the rotary motor (10) in such a way, that the percussion unit (11) stops automatically when the rotary motor (10) comes to a standstill. The coupling is achieved by employing fluid driven means without mechanical clutch between rotary motor (10) and percussion valve (17). When disassembling the drill rods a jammed thread can be shaken loose with the percussion unit (11) be manually …
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 September 23, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2020.
- 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.