Method of drilling a branch line aperture after internal lining of a pipeline and a water plug used in the method
CA 1301084 C · Owner: Yasuhara, Minoru · Inventors: Kitahashi, Naoki; Oi, Hisaichi; Miyazaki, Harutoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of drilling apertures for branch lines blocked by renovation lining of a main pipeline which comprises setting a water plug in the opening of each branch line prior to lining, said water plug carrying a position marker comprising an antenna coil and a resonator adapted to be excited by a driving signal and after stoppage, of the driving signal, release a resonance signal remaining in the resonator from the antenna coil and said position marker being situated in a position which upon setting of the, water plug in position is substantially concentric with the, axis of the branch line causing an antenna assembly for, detecting the resonance signal to travel …
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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
- Granted May 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 2009.
- 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
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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.