Modified polytetrafluoroethylene fine powder and production of the same
CA 1293892 C · Owner: Hosokawa, Kazutaka · Inventors: Hosokawa, Kazutaka; Shimizu, Tetsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a modified PTFE fine powder which comprises primary particles having an average particle size of 0.1 to 0.6 µm and contains 0.01 to 0.15% by weight, based on the whole weight of the particles of at least one olefinically unsaturated compound selected from the group consisting of a fluoroalkyl vinyl ether of the formula:, X(CF2)nOCF=CF2 (I), wherein X is a hydrogen atom a fluorine atom or a chlorine, atom and n is an integer of 1 to 6 and a fluoroalkyl vinyl, ether of the formula: C3F7(OCF2CF2CF2)mOCF(CE3)CF2?OCF=CF=2 (II) wherein m is an integer of 0 to 2 and ? is an integer of 0 to 2 mainly in the core parts of the particles and 0.04 to 0.25% by weight, …
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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 January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 2009.
- 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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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.