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
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract 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.
Read the whole patent
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.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.