Polymer blends useful for forming extrusion blow molded articles
CA 2136732 A1 · Owner: Eastman Kodak Company · Inventors: Light, Ronald R.; Mercer, James W. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a polymer blend having excellent clarity and impact strength which is suitable for use in extrusion blow molding processes comprising: a) 50-95 wt.% of a polyester having repeat units from at least 95 mol % terephthalic acid at least 90 mol %, ethylene glycol and up to 10 mol % 1,4-cyclohexanedimethanol the, polyester having an average molecular weight of 75,000-85,000; b) 40-4 wt.% of recycled scrap polyester having repeat units from at least 90 mol % terephthalic acid and at least 90 mol % ethylene glycol and having a molecular weight of 40,000-55,000 and c) 1-10, wt.% of a polymeric material containing at least 90 wt.% polycarbonate and up to 10 wt.% polyethylene …
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 June 1, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 1, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2015.
- 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.