Perforation method
CA 1084834 A · Owner: Oy Wartsila Ab · Inventors: Kanervo, Seppo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for providing a running web with a perforation pattern fitting into printed image units successively printed on the web. The method includes the steps of performing a longitudinal perforation in a separate longitudinal perforator and performing a transverse perforation in a transverse perforator wherein the perforation, is divided to be carried out by a plurality of separate units. The pitch of the transverse perforation rows in the longitudinal direction of the web is controlled by changing the relative position of the transverse perforation units with respect to each other in accordance with the desired perforation pattern. The transverse perforator can be formed by a plurality …
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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 2, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 2, 1997.
- 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.