Canadian application, no grantCanada
Preparation process of aliphatic isocyanate
CA 2028162 A1 · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Nagata, Teruyuki; Mizuta, Hideki; Wada, Masaru
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is an industrially efficient and improved process for the preparation of aliphatic polyisocyanates by using esters as the solvent for converting aliphatic polyamines to isocyanates.
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 October 22, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 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.
FiledOctober 22, 1990
GrantedNo grant recorded
Term endedOctober 22, 2010
Patent numberCA 2028162 A1
Classification (IPC)C07C263/10 +1 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.