Expired Canadian patentCanada
Process for making cotton blend warp yarns for durable fabrics
CA 2036937 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Green, James Ralph
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Staple yarns of cotton and high modulus fiber are wet and then dried under tension to provide warp yarn for durable, abrasion resistant fabrics.
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 February 22, 1991 and granted October 31, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 22, 1991
GrantedOctober 31, 2000
Term endedFebruary 22, 2011
Patent numberCA 2036937 C
Classification (IPC)D03D15/00 +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.