Device for retaining knife blades for cutting a paper web
CA 2008833 C · Owner: Larsson, Rolf Arne · Inventors: Stromberg, Sven Arne Roland; Larsson, Rolf Arne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a device for retaining knife blades for cutting, perforation or other treatment of a running web, preferably a paper web whereby, said web (4) runs between a rotatable knife retaining cylinder (3) and a rotatable counter pressure cylinder (5) and whereby the knife blade (2) and a retaining ruler (7) for retaining the blade (2) are provided in a slot (6) in the knife retaining cylinder (3). In order to reduce the time for mounting the knife blades the, retaining ruler (7) has a relative to the slot (6) downwardly inclined wedge surface (10) through which, said ruler (7) cooperates with a corresponding downwardly inclined wedge surface (11) on a tightening …
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 January 29, 1990 and granted May 12, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 2012.
- 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.