Method and apparatus for manufacturing porous polytetrafluoroethylene material
CA 1254707 A · Owner: Sumitomo Electric Industries, Ltd. · Inventors: Yamada, Katsuya; Okita, Koichi; Toyooka, Shinichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method and apparatus for manufacturing a porous polytetrafluoroethylene (PFTE) material with high strength properties. Such method comprises forming a molded article from a mixture of unsintered PFTE and liquid lubricant by extruding and rolling, and subsequently combining the previously-used separate steps of 1) eliminating liquid lubricants by evaporation or extraction 2) rendering the molded article porous by stretching and 3), sintering the porous article to fix the porous structure into one simultaneous operation carried out at a temperature not lower than 390°C, to obtain a material having a Young's Modulus of more than 10,000 kg/cm2 and a matrix tensile strength of more …
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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 May 30, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 30, 2006.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.