Hose for lining pressure pipe lines
CA 2066813 C · Owner: Schwert, Siegfried · Inventors: Schwert, Siegfried; Huemer, Franz-Xaver
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hose for lining pressure pipe lines is described comprising a web being made up of warp and woof threads which, are made of plastic, as well as a coating of thermoplastic material, which coating is impermeable to the medium to be transported in said pipe lines and is applied onto one side of said web. Due to the pressure of a fluid the hose is, introduced into a pipe line and turned up therewith in which, case a cement in the interior of said hose will prior to, turning-up, come between the outside of said hose and the inside wall of said pipe line. In order to on the one hand, obtain high strength in longitudinal direction and to on the, other hand, facilitate introduction of said hose …
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 April 22, 1992 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 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.