Polycarbonates containing aralkylphenyl end groups, their preparation and their use
CA 1322809 C · Owner: Bayer Aktiengesellschaft · Inventors: Dujardin, Ralf; Meyer, Rolf-Volker; Siebourg, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polycarbonates containing aralkylphenyl end groups their, preparation and their use, A b s t r a c t This invention relates to thermoplastic aromatic poly-, carbonates prepared with the aid of chain terminating agents corresponding to formula (I), (I) , to a process for the preparation of these polycarbonates and to their use for the production of moulded articles for optical purposes. Le A 25 195
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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 October 5, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 5, 2010.
- 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.