Non-digging tube reverse lining engineering method of conduit
CA 2035042 C · Owner: Imamura, Minoru · Inventors: Ikeda, Seiichi; Toyoda, Shigeru; Kobayashi, Hiroaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An engineering method of providing a lining onto the internal face of conduits for gas, city water etc. that are, burled underground. This lining work shall entirely be done from the portions exposed above ground. The distance of the supply pipe to the service tee is measured. The lining tube is set to a length that is slightly longer than this distance. The lining tube is turned inside out inside the supply pipe. As a result a slightly longer length of non-reverse portion is left inside the supply pipe by the service tee. This nonreverse portion is helpful when cutting the rewinding tape that is tied to the lining tube after the insertion of a cutter. Next the heating tube shall be …
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 4, 1990 and granted February 27, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 2012.
- 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.