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Expired Canadian patentCanada

Splice and process for making a splice on the leader of a paper roll

CA 2039631 C · Owner: 3M Innovative Properties Company · Inventors: Kaufmann, Bern; Madrzak, Zygmunt

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

For making a web connection, an adhesive tape is used which essentially features on, only one side an adhesive layer. The cover foil of this adhesive layer is comprised of two, parts that are separated by a longitudinal seam. Applied on the other side of the substrate of, the adhesive layer is at least one narrow adhesive strip also having a cover , foil, which, preferably is contained on an edge of the adhesive tape. Also provided is a double-stick, adhesive tape wherein the longitudinal seam is created by a plurality of perforations. The, tapes of the invention can be used as a splice for a paper roll. Processes and devices for, making such splice are also disclosed.

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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

  • Filed April 3, 1991 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2011.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 3, 1991
GrantedFebruary 8, 2000
Term endedApril 3, 2011
Patent numberCA 2039631 C
Classification (IPC)B65H19/28 +2 more

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedApril 3, 1991Patent grantedFeb 8, 2000Term endedApril 3, 2011

Sources & verification

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