Poly(arylene sulfide) sheet and production process thereof
CA 2004273 C · Owner: Wakabayashi, Juichi · Inventors: Saito, Takeshi; Mizuno, Toshiya; Wakabayashi, Juichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A poly(arylene sulfide) sheet excellent in planarity and smoothness is formed of a poly(arylene sulfide) having a melt viscosity, ?* of 1,000-25,000 poises as measured at 310°C and a shear rate of 200 sec- 1, and a melt crystallization temperature Tc2 of 170-, 240°C, wherein Tc2 is an exothermic peak temperature of crystallization which appears upon the measurement by a differential scanning calorimeter at a cooling rate of 10°C/min after the polymer is heated from 23°C to 380°C at a rate of 10°C/min and then held for 3 minutes at 380°C. It has a surface roughness, Ra of 0.09 µm or less on at least one side thereof and a degree of crystallization of at least 5%. Its number of flexings to …
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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
- Filed November 30, 1989 and granted April 12, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.