Removal of caprolactam and oligomers thereof from nylon granules containing same
CA 1302000 C · Owner: Cordes, Claus · Inventors: Pipper, Gunter; Cordes, Claus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/39067, Abstract of the Disclosure: Caprolactam and oligomers thereof are removed from nylon granules containing same in a process wherein, a) nylon granules are introduced at not less than 100°C at the top of a substantially upright treatment zone b) nylon granules are passed downward through the treatment zone while being heated to from 130 to 210°C c) superheated steam is passed at from 130 to 210°C upward through the treatment zone, d) dry nylon granules are withdrawn at the bottom end of the treatment zone and steam containing caprolactam and oligomers thereof is withdrawn at the top of the treatment zone, e) the caprolactam and oligomers thereof containing steam thus obtained …
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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 May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 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
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.