Wastewater system rehabilitation using multi-layer liner
CA 2175464 C · Owner: Cci Spectrum, Inc. · Inventors: Hume, James M.; Daniele, Joseph Taylor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A technique and device for rehabilitating or repairing wastewater system components or the like, comprising a spray-applied, multilayer liner (10) which seals the components and imparts structural integrity. The liner (10) comprises a primer layer (11), a first moisture barrier layer (12), a foam layer (13), and a second moisture barrier layer (14). The first and second moisture barrier layers (12 14), are preferably made of the same material and form a skin on both sides of the internal foam layer. The combination of the foam layer (13) and the two moisture barrier layers (12 14), imparts structural strength and rigidity to the cured liner. Preferably, the primer layer (11) is an epoxy, …
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 23, 1994 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2016.
- 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.