Process for producing self-adhesive sheet materials
CA 2089002 C · Owner: Cova Products Limited · Inventors: Arkell, Philip; Warwick, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for providing lengths of self-adhesive strip materials as laminates comprising in sequency the substrate (3) adhesive (4) and release sheet (5) in which process the laminate is first subjected to a cutting operation in which the substrate is cut through with a die (8) without cutting through the underlying release paper to form a product strip which is continuous in the machine direction, the laminated strip is then severed (17) in the cross direction through its entire thickness and reeled off to form product rolls. Preferably the starting material is converted into several parallel machine direction lengths of product (18) separated by cutting the substrate through its entire …
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 13, 1991 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2013.
- 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.