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Expired Canadian patentCanada

Alternately twisted yarn assembly and method for making

CA 1062562 A · Owner: E.I. Du Pont De Nemours And Company · Inventors: Lin, Perry H.

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Alternate-twist plied yarns, wherein a secondary strand for providing a special effect is plied with at least two alternately, false-twisted primary strands are made, by converging the secondary strand with the primary strands downstream of the point at which the primary strands are converged. Node centers at the twist reversal points for the secondary strand are displaced with respect to node centers of the primary strands. Improved effectiveness from an antistatic secondary strand in the plied yarn can be obtained by this method. Where a node of a secondary strand overlaps a node of the primary strands whether or, not the node centers are displaced a preferred configura-, tion is one …

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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 September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedSeptember 18, 1979
Term endedSeptember 18, 1996
Patent numberCA 1062562 A
Classification (IPC)D02G3/28 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedSep 18, 1979Term endedSep 18, 1996

Sources & verification

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