Expired Canadian patentCanada
Low density flexible integral skin polyurethane systems using thermoplastic hydrocarbon microspheres and water as co-blowing agents
CA 2107416 C · Owner: Valoppi, Valeri L. · Inventors: Valoppi, Valeri L.; Harrison, Richard P.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It was found that a combination of thermoplastic microspheres containing a volatile hydrocarbon and water could be used as effective co-blowing/density reducing agents in low density, integral skin polyurethane foams.
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 30, 1993 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 30, 1993
GrantedNovember 3, 1998
Term endedSeptember 30, 2013
Patent numberCA 2107416 C
Classification (IPC)C08L75/04 +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.