Method for controlling the winding density of film rolls
CA 2270712 A1 · Owner: Trespaphan Gmbh · Inventors: Schmidt, Robert; Mathieu, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method and apparatus for controlling the winding density of film rolls a, desired and an actual winding density of a film roll are determined and compared with one, another. The quantity obtained from the comparison is multiplied by an adapting or, damping factor .alpha. and the control output resulting therefrom is adapted to the film contact, pressure and the film pull. The values thus obtained are fed as manipulated variables to a, contact pressure actuator and a pull actuator for the film.
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 29, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2021.
- 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.