Coating of substrates
CA 2016889 C · Owner: John Waddington Inc. · Inventors: Sanderson, Martin Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a substrate forming a web of primary labels. One side has a silicone release coating and the other side has pressure sensitive adhesive so that the web can be wound into roll form without the use of a carrier sheet. In order to enable overprinting or secondary labels to be anchored to the primary labels a keying coating is applied over the silicone release coating, said keying coating comprising basically a silicone low tack pressure sensitive adhesive mixed with an organic solvent.
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 May 16, 1990 and granted July 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 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.