Dyed sheath/core fibers and methods of making same
CA 2383870 C · Owner: Honeywell International Inc. · Inventors: Bailey, Bobby J.; Mcintosh, Stanley A.; Hoyt, Matthew B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bath-dyeable and bath-dyed filaments and methods have a core and a sheath which entirely surrounds the core. The core is formed of a core polymer which is susceptible to dyeing by a bath dye chemical while the sheath is formed of a sheath polymer which is resistant to dyeing by the bath dye chemical. When the filament is brought into contact with a dye bath containing the dye chemical the dye chemical in the dye bath will be physically transported through said sheath polymer to cause the core polymer to be dyed a color of the dye chemical while the sheath polymer is substantially undyed thereby.
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 April 29, 2002 and granted June 14, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2024.
- 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.