Biaxially oriented polystyrene with high clarity and ductility
CA 2255380 A1 · Owner: Menawat, Arun S. · Inventors: Okamoto, Kelvin T.; Menawat, Arun S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A film consisting essentially of polystyrene and styrene-butadiene copolymer. The film has a haze of less than about 15 % when haze is measured with a sample of the film being 15 mil thick by ASTM D1003-92 and has a ductility greater than about 1 in-lbs as measured by the Gardner impact test (ASTM D5420-93) at room temperature with a sample of film being 15 mil thick. The film is biaxially oriented and comprises from about 60 to about 94 wt.% polystyrene and from about 6 to about 40 wt.% styrene-butadiene copolymer of the total weight of the film. The styrene-butadiene copolymer has a butadiene content of from about 10 to 50 wt.% of the styrene-butadiene copolymer. The film may be formed …
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 December 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2020.
- 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.