Process for the preparation of molded articles and the molded articles obtainable by said process
CA 2002946 C · Owner: Wagner, Joachim · Inventors: Rasshofer, Werner; Wagner, Joachim; Jurgens, Eberhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for the preparation of single-layered or multilayered molded articles from particles of polyisocyanate-polyaddition products comprising thermoplastically shaping under pressure (i) polyisocyanate-polyaddition products prepared by reacting (a) aliphatic, cycloaliphatic, or aromatic polyisocyanates;, (b) compounds having a molecular weight of from about 1800 to about 12,000 and containing, on statistical average, at least 2.5 isocyanate-reactive groups; (c) optionally, diamines having a molecular weight of from about 108 to about 400 with two primary and/or secondary aromatically bound amino groups; and (d) optionally, alkane polyols, cycloalkane polyols …
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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 14, 1989 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 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
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.