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Expired Canadian patentCanada

Twisted yarn and method of producing the same

CA 1185130 A · Owner: Toray Industries, Inc. · Inventors: Nakayama, Takashi; Kajita, Koji; Yamagata, Seiichi

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Abstract From the Canadian patent

Disclosed herein is a twisted yarn comprising at least two bundled sheaves of staple fibers each sheaf, having an initial twist of substantially zero the, sheaves of staple fibers being mutually twisted to form the yarn. The coefficient of finishing twist utilization as defined in the specification is at least 150%. Also disclosed is a method of producing a twisted yarn comprising drafting a sheaf of staple fibers supplying the sheaf to a bundling zone to reduce it to a bundled sheaf having an initial twist of substantially zero, drafting another sheaf in a similar manner doubling, at least two such bundled sheaves of staple fibers and, twisting them together.

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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 April 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 2002.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 31, 1981
GrantedApril 9, 1985
Term endedApril 9, 2002
Patent numberCA 1185130 A
Classification (IPC)D02G3/22 +2 more

Timeline

Timeline From CIPO dates

1982198519881991199419972000Application filedMarch 31, 1981Patent grantedApril 9, 1985Term endedApril 9, 2002

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.