Process for crosslinking polyamines and crosslinked gelatin foams
CA 1264898 C · Owner: The Dow Chemical Company · Inventors: Freedman, Harold H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyalkylenepolyamines and gelatins are crosslinked in a non-anhydrous environment to yield water-swellable, essentially water-insoluble gels and foams. The polyalkylenepolyamine is contacted with a polyisocyanate at a pH between 5 and 8 and subjected to a high rate of agitation. The gelatin is contacted with a polyisocyanate at a pH between 6 and 8 and subjected to a high rate of agitation. The process of this invention can be employed to immobilize proteins enzymes, antibodies, etc.
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
- Granted January 23, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 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.