Canadian application, no grantCanada
Process for incorporating additives in thermoplastic polymers
CA 2048227 A1 · Owner: Shell Oil Company · Inventors: Chang, David S.; Chatterjee, Ananda M.
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 provides a continuous process for incorporating an additive into particles of a thermoplastic polymer by high speed/high intensity gas entrained mixing of the particles and the additive.
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 July 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 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.
FiledJuly 31, 1991
GrantedNo grant recorded
Term endedJuly 31, 2011
Patent numberCA 2048227 A1
Classification (IPC)C08J3/20
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.