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Expired Canadian patentCanada

Continuous pressure roll winder

CA 1212656 A · Owner: Black Clawson Company (The) · Inventors: Tetro, Richard S.

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

A turret-type winder particularly adapted for winding of impervious sheet-type web materials such as plastics, provides self-contained and pivotally mounted pressure rolls which contact the cores and the winding roll throughout the entire winding process and throughout the indexing of the arms from a core loading station to a roll unloading station while maintaining the relative geometry of contact such that the web contacts the pressure roll at or before contacting the winding roll for effectively excluding the entrapment of air between the winding layers. A method of winding from a roll changer or other apparatus for providing a web of material includes the movement of the spindle end of …

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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 October 14, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 14, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 25, 1982
GrantedOctober 14, 1986
Term endedOctober 14, 2003
Patent numberCA 1212656 A
Classification (IPC)B65H19/20 +2 more

Timeline

Timeline From CIPO dates

1983198619891992199519982001Application filedNov 25, 1982Patent grantedOct 14, 1986Term endedOct 14, 2003

Sources & verification

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