Process and apparatus for modifying polyamide amine end content
CA 2002023 A1 · Owner: Parlee, Brian Rutherford · Inventors: Parlee, Brian Rutherford
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for controlling the amine end content or dyeability of polyamide articles during the manufacture thereof is disclosed. The articles are manufactured by forming them from a stream of molten polyamide. Firstly either a dyeability measurement or an amine end measurement of the articles is taken at periodic intervals. The dyeability measurement or amine end measurement is then compared to a set point representing the desired dyeability or number of polyamine ends of the articles. Diamine is then injected into the stream of molten polyamide in response to any deviation of the dyeability measurement or amine end measurement from the set point. The diamine is injected at an injection …
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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 November 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2011.
- 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
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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.