Process and device for lining a pipe, in particular a sewer pipe
CA 2006819 A1 · Owner: Koninklijke Wegenbouw Stevin B.V. · Inventors: Spee, Paulus R.; Vos, Jannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Device and process for lining a damaged pipe such as a sewer pipe by, drawing an inflatable inner tube (4,9) or airtight and watertight material into the sewer pipe, which inner tube is surrounded by one or more lengthwise extending chambers into which a hardening material is pumped following the inflation of the inner tube.
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 December 28, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2011.
- 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.