Method for preparing and applying a sprayable, light stable polyurethane
CA 2007899 C · Owner: Du Prez, Eddie · Inventors: Du Prez, Eddie; Jourquin, Lucien
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for preparing a light stable polyurethane sprayable by, means of a spray pistol, wherein use is made of an active hydrogen containing compound, wherein the functional groups consist for at least 50% of an active CH2OH, NH and/or NH2 group the functionali-, ty of which varies from 2 to 8 and the equivalent weight of which is comprised between 100 and 3500, together with 2 to 300 parts per 100 parts of said compound, of a chain extender and/or a cross-linker the functional groups of which are OH groups at least 50% of which, are primary OH groups the equivalent weight of which is less than 100 and the functionality of which varies from 2 to 6 and with a, catalytic system which …
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 January 16, 1990 and granted October 15, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2012.
- 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.