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Expired Canadian patentCanada

Method of coating strands and apparatus used therein

CA 1108859 A · Owner: Ppg Industries, Inc. · Inventors: Drummond, Warren W.

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Abstract From the Canadian patent

A method of treating textile strands wherein textile filaments are coated with aqueous solutions of coating material or contacted with a substance to be incorporated into said strand, gathered into strands and the strands are collected, the improvement comprising passing the treated strands into a zone of fluid turbulence, passing a gaseous fluid in contact with said zone and circumferentially around said zone so thereby remove excess solution or substance from said strand, directing the solution or substance removed from said zone to n collection zone and recovering the solution or substance collected therein. In some instances the yarn itself is improved in that flat yarns being treated …

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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 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 15, 1977
GrantedSeptember 15, 1981
Term endedSeptember 15, 1998
Patent numberCA 1108859 A
Classification (IPC)D06M15/00 +2 more

Timeline

Timeline From CIPO dates

1978198119841987199019931996Application filedSep 15, 1977Patent grantedSep 15, 1981Term endedSep 15, 1998

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