Expired Canadian patentCanada
Polyesters and polyester urethanes
CA 2039588 C · Owner: Ullrich, Volker · Inventors: Ullrich, Volker
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to polyesters and polyester urethanes which are stabilized against discoloration or hydrolytic degradation. At the same time the quantity of, isocyanate eliminated from polyester urethanes is considerably reduced.
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 2, 1991 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 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.
FiledApril 2, 1991
GrantedFebruary 19, 2002
Term endedApril 2, 2011
Patent numberCA 2039588 C
Classification (IPC)C08K5/29 +2 more
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.