Unsaturated polyester resins
CA 2042493 A1 · Owner: Bocci, Marco · Inventors: Sanchioni, Sergio; Leonardi, Maurizio; Caramaschi, Giuseppe Antonio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Unsaturated polyester resin compositions (UPR) are disclosed as well as monomeric compounds of the formula: (I), where R, R1 and R2 are H or a methyl group. The compounds (I) are useful as accelerators and crosslinking agents in the preparation of the UPR's and a process for the preparation thereof is also disclosed.
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 May 14, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 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.