Canadian application, no grantCanada
High strength fibers or films of aromatic copolyamides with pendant carboxyl groups
CA 2031921 A1 · Owner: E.I. Du Pont De Nemours And Company · Inventors: Irwin, Robert S.; Irwin, Robert S.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The reactivity of aromatic copolyamide fiber and film is enhanced by incorporation of small amounts of 4,4'-diaminodiphenic acid units in the polymer chain. SS:XXIV-6
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 December 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2012.
- 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, 1990
GrantedNo grant recorded
Term endedDecember 10, 2010
Patent numberCA 2031921 A1
Classification (IPC)C08G69/12 +2 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.