Preparation of precipitated polyamide powders of narrow particle size distribution and low porosity
CA 2231209 A1 · Owner: Baumann, Franz-Erich · Inventors: Wilczok, Norbert; Baumann, Franz-Erich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for preparing polyamide powder having a narrow particle size distribution and a low porosity. The process comprises, (1) dissolving a polyamide having at least 10 C atoms in its monomer in a C1-C3 alcohol under pressure to produce a solution at 130-165°C (2) cooling, the solution without precipitation until nucleation takes place and maintaining the temperature constant for awhile (3), further cooling the solution until super saturation results (4) then precipitating particles of the polyamide at a constant temperature to obtain a suspension and (5) drying the polyamide particles. The polyamide powder so-obtained is useful, for example, as a coating material.
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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 March 3, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 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.
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.