Expired Canadian patentCanada
High strength fibers from chitin derivatives
CA 1294958 C · Owner: E.I. Du Pont De Nemours And Company · Inventors: O'Brien, John Philip; Kezar, Hollis Smith, Iii; De Lucca, George Vincent
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High tenacity chitin acetate/formate and chitosan acetate/formate fibers and the process for making such fibers are disclosed. QP-3225
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 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 28, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 10, 1987
GrantedJanuary 28, 1992
Term endedJanuary 28, 2009
Patent numberCA 1294958 C
Classification (IPC)C08B37/08 +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.