Boring ram
CA 2178527 C · Owner: Kurlenya, Mikhail Vladimirovich · Inventors: Fetisov, Sergei Jurievich; Grigoraschenko, Vladimir Alexandrovich; Klimenko, Vladimir Alexeevich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to building and to mining more particularly to, an apparatus for impact action designed for trenchless laying of new underground communications and for reconstruction of existing communications, the apparatus comprising a body a striker with a through, central channel the striker positioned inside the aforesaid body with the possibility of performing reciprocal movement a front chamber formed, between the aforesaid body and aforesaid striker a rear chamber formed, between the aforesaid body and the aforesaid striker an air distribution system, comprising channels for the inlet of compressed air into the aforesaid chambers and channels for the exhaust of spent …
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 7, 1996 and granted October 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 2018.
- 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.