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Expired Canadian patentCanada

Improved apparatus for guiding a web leader in a paper machine

CA 1267429 C · Owner: Valmet Oy · Inventors: Viitanen, Olavi; Kerttula, Reima

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

An improvement in apparatus for guiding a web leader from a press section to a drying section of a paper machine the, apparatus including flexible guide ropes forming a gap into which the leader is shifted, an initial air blow device for guiding the leader towards the drying wire of the drying section a first, blow member for detaching the leader from the drying wire and a second blow member for applying transversely directed air jets onto the leader to shift it into the gap formed by the guide ropes. According to the improvement, the second air blow device includes a blow member which is mounted for pivotal movement between a non-operating lateral position outside of the edge of the drying …

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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 3, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 2007.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 1, 1985
GrantedApril 3, 1990
Term endedApril 3, 2007
Patent numberCA 1267429 C
Classification (IPC)D21F1/42 +1 more

Timeline

Timeline From CIPO dates

19861989199219951998200120042007Application filedMay 1, 1985Patent grantedApril 3, 1990Term endedApril 3, 2007

Sources & verification

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