Web tensioning device
CA 2134129 C · Owner: Simons, Robert · Inventors: Parish, Russell; Simons, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A web tensioning system for controlling the web tension from a supply roll source comprising in combination; a pay-off supply roll having a drive motor, and a motor controller interconnected thereto, a film web extending from said supply roll through a multiple roller assembly downstream of said supply roll said roller assembly comprising at least one idler roller and a, sensing roller, pressure transducers on said sensor roller a, conditioning circuit receptive to input signals from said pressure transducers, a control signal generated from said conditioning circuit to said motor controller in response to a film web tension value, a source of power for said motor controller motor and said, …
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 October 24, 1994 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2016.
- 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.