Winding-up process and machine for winding up webs of paper or cardboard
CA 2264804 C · Owner: Hehner, Reinhard · Inventors: Muller, Georg; Hehner, Reinhard; Peters, Hans-Friedrich
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 process and a machine for winding up a web (1) of paper or cardboard onto winding sleeves (14) in which, a) during the winding-up process the winding-up roll (3) is, pressed with an adjustable contact pressure against a driven support roller (4) that has an outer layer (6) the volume of which can be can be compressed said layer being, at least 5 mm thick, of a cellular plastic material with a plurality of uniformly distributed pores and a modulus of compression it of less than 10 MPa;, b) the web (1) that is fed to the winding-up roll (3) wraps around the support roller (4) ahead of the nip (7) between the winding-up roll (3) and the supporting roll (4) in …
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 August 28, 1997 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2019.
- 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.