Catalytic preparation of linear polyethylenepolyamines
CA 2000032 A1 · Owner: Union Carbide Corporation · Inventors: Knifton, John Frederick; Su, Wei-Yang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CATALYTIC PREPARATION OF, LINEAR POLYETHYLENEPOLYAMINES (D#80,803-F), ABSTRACT OF THE DISCLOSURE This invention is directed to novel phosphorus-free catalyst compositions based on titania pellets on which a minor amount of a tungstosilicic acid or a molybdosilicic acid is deposited. Also, the invention is directed to a process for preparing predominantly linear polyethylenepolyamines from ethylenediamine and monoethanolamine using the novel catalyst compositions.
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 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2011.
- 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.