Process and device for actuating a percussive tool by means of compressed air
CA 2135896 A1 · Owner: Briem, Rolf · Inventors: Briem, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention pertains to a process and device for actuating a percussive tool by means of a free piston (4) which is moved back and forth with compressed air, to a device for carrying out the process and to a hammer drill and a crushing bit on which this process and device are based. In the rotary piston compressor unit an inner (2) and an outer rotor (3) turn in an intermeshed rotation a, compression space and a suction space being formed alternately on radially offset sides of the inner rotor. The piston (4) moves axially in a hollow space of the inner rotor (2), which has front (2.1) and rear (2.2) control channels, which have axially offset apertures near the two ends of the hollow …
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 May 13, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 13, 2015.
- 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.