Star/comb-branched polyamides and star/comb-branched polyamine derivatives thereof
CA 1265641 C · Owner: Dendritic Nanotechnologies, Inc. · Inventors: Tomalia, Donald A.; Hall, Mark J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A star-branched polyamide having at least 3 branches emanating from the residue of a core compound pending from a substantially linear polymer backbone wherein each branch has a plurality of amide moieties in which each such amide moiety has its amide nitrogen in the chain of the branch and each such amide nitrogen bears a pendant carbonyl moiety, said amide moieties being hydrolyzable to form amine moieties without cleaving the chain of the branch. Star-branched polyamides having good resistance to degradation upon exposure to shear are prepared by reacting polyvalent core compounds such has tribromoneopentyl alcohol with an oxazoline such as 2-ethyl-2-oxazoline to provide the desired …
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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
- Granted February 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- 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.