Trenchless pipeline installation method with pilot hole corrective alignment
CA 2183675 C · Owner: Coss, Timothy R. · Inventors: Coss, Timothy R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A corrective trenchless pipeline in-, stallation method basically includes the operational steps of forming an initial pilot hole (10) underground in earthen matter between a pair of spaced entry and exit pits (18, 20) formed in the earthen matter and reforming the initial pilot hole (10) into a trenchless corrected pilot hole (12). The initial pilot hole (10) is formed along a first line extending from an entry point (19) to an actual exit point (21) wherein the first line of the initial pilot hole (10) is substantially irregular compared to a desired second line of the trenchless corrected pilot hole (12) which is substantially straight and extends from substantially the same entry point …
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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
- Filed February 22, 1995 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2017.
- 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.