Lining material for pipe lines and a process for providing pipe lines therewith
CA 2072173 C · Owner: Ashimori Industry Co. Ltd. · Inventors: Imoto, Takayoshi; Okahashi, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lining material for pipe lines, especially those buried in the ground such as sewage pipe lines and a process for providing such pipe lines therewith are disclosed, which material comprises a flexible tubular film, a resin-impregnated sheet covering the outer surface of the flexible tubular film, and a tubular covering material having a strong resistance to tensile force. The sheet may be constructed by several units of sheet fractions arid is overlapped in both lateral end portions so as to be slidable each other in opposite directions to form a tubular sheet. The lining material is applicable for repair/and reinforcement to the inner surface of a pipe line having damages portions. …
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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 June 23, 1992 and granted June 4, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2014.
- 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.