Process for continuous dyeing of poly (m-phenyleneisophthalamide) fibers
CA 1302016 C · Owner: Davis, James K. · Inventors: Davis, James K.; Cates, Barbara J.; Russell, Ernest J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Continuous dyeing of poly(m-phenyleneisophthalamide) fibers using a swelling agent to introduce a dye and optionally a flame retardant into the fiber. The dyed fiber has properties of strength and flame resistance approximating the original undyed fiber and when a flame retardant is used, greater than that of the untreated fiber. These aramid fibers are conveniently dyed to an unlimited range of colors with high color yield and relatively good lightfastness at a reasonable cost. An aqueous dimethylsulfoxide solution is used as the preferred swelling agent.
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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
- Granted June 2, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 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.
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.