Expired Canadian patentCanada
Dyeing articles composed of melamine fiber and cellulose fiber
CA 2232257 C · Owner: Basf Corporation · Inventors: Gadoury, Dean R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Melamine fibers and cellulose fiber combinations are dyed with certain dyes such that the cellulose fiber is dyed by the dyes but the melamine fiber is substantially undyed. When in fabric form a chambray appearance is given.
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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
- Filed April 23, 1998 and granted September 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 23, 1998
GrantedSeptember 18, 2001
Term endedApril 23, 2018
Patent numberCA 2232257 C
Classification (IPC)D06P3/85 +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.