Dispersing agent
CA 2242593 A1 · Owner: Pirrung, Frank Oliver Heinrich · Inventors: Quednau, Peter Hermann; Pirrung, Frank Oliver Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a dispersing agent or salts thereof comprising the , reaction product of: A) one or more polyisocyanates with an average functionality of about 2 to about 5, with B) a compound of the type Y-R-X wherein Y represents a ring structure with at least one nitrogen atom in the ring, R represents a chain of at least three atoms and X has the meaning O-R1 or N(R1)(R2), wherein R1 is H or a group of the formula R3-Z wherein R3 , represents a chain with at least two atoms and Z represents OH or NH2 and R2 , represents a group of the formula R3-Z which compound is obtainable through , reaction of an acrylate compound or an epoxide compound with a cyclic compound which has …
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 January 22, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2019.
- 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.