Environmental stress failure resistant polycarbonate
CA 2002259 A1 · Owner: Hoenig, Stephen M. · Inventors: Chou, Chai J.; Farah, Hani; Hoenig, Stephen M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Environmental stress failure resistant and impact resistant polycarbonates are prepared from an aromatic polycarbonate and a copolymer of ethylene and carbon monoxide. These polycarbonates exhibit high impact resistance, chemical resistance temperature, stability and excellent thermoplastic engineering properties, making them suitable for producing molded plastic components for the automotive and electrical housing manufacturing industries. 37,050-F
Read the whole patent
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 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 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.