Branched polycarbonates containing double-ring aromatic compounds
CA 1270591 C · Owner: Pilati, Francesco · Inventors: Petri, Alberto; Pilati, Francesco; Berti, Corrado
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
BRANCHED POLYCARBONATES CONTAINING DOUBLE-RING AROMATIC COMPOUNDS", Abstract, In the present invention disclosed are highmolecular-weight, soluble, thermoplastic branched polycarbonates endowed with improved properties and, suitable to blow-moulding fabrication.. Such polycarbonates are characterized by the presence, in their structure, of units deriving from the following double-ring aromatic compounds: wherein R1 indicates H, -COCl, -SO2Cl; R2 R3 and R4, equal to or different from each other indicate -COCl or, SO2Cl. The above-said compounds are directly used in the syntheses.
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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 June 19, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 2007.
- 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.