Epoxy/polyolefin coating process
CA 2089766 C · Owner: Cox, James John William · Inventors: Pfaff, Toni Alois; Cox, James John William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of coating, metallic pipe is disclosed. The method comprises heating the pipe to, a temperature of at least 200 °C and applying an, epoxy resin composition having a thickness of at, least 300 microns to the outer surface of the heated, pipe. Before the epoxy resin composition has, completely cured but, preferably after it has, gelled, a coating of a modified polyolefin is, applied in a thickness of up to 500 microns. The modified, polyolefin is a homopolymer or copolymer of, hydrocarbon alpha-olefins having 2-10 carbon atoms, that has been modified by grafting with ethylenically, unsaturated organic carboxylic acid or anhydride. An outer coating of a polyolefin is then applied in a …
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 August 16, 1991 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 2013.
- 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.