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Expired Canadian patentCanada

Woven fabric for papermaking having recesses on papermaking surface filled withauxiliary wefts

CA 1307994 C · Owner: Nagura, Hiroyuki · Inventors: Watanabe, Taketoshi; Nagura, Hiroyuki; Tate, Takuo

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

In a single-layer papermaking woven fabric or more than three shafts having an extended running surface formed from long crimped primary wefts auxiliary wefts, each having a smaller diameter than that of primary wefts are each disposed between each of primary wefts. Every auxiliary weft is placed on warps at portions extended from the paper side of where warps are primary weft to the running said of the succeeding primary weft or at portions where warps are extended from the running side of a primary weft to the paper side of the succeeding primary weft. Each of said auxiliary wefts is woven into texture of the fabric at least once in a repeating unit by a warp to thereby complete the …

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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 29, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 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.
FiledAugust 30, 1989
GrantedSeptember 29, 1992
Term endedSeptember 29, 2009
Patent numberCA 1307994 C
Classification (IPC)D03D13/00 +2 more

Timeline

Timeline From CIPO dates

1990199219941996199820002002200420062008Application filedAug 30, 1989Patent grantedSep 29, 1992Term endedSep 29, 2009

Sources & verification

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