Cardboard with coating on one side
CA 2124576 A1 · Owner: Stora Feldmuhle Ag · Inventors: Dahling, Paul-Heinz; Bergmann, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The cardboard described has a coating applied by cast-coating, the side of the cardboard on which the coating is applied having, before application of the coating, a water-absorption capacity, measured by the Cobb sizing test, of 25 to 40 g/m2 per minute and the, coating consisting of a film-forming synthetic-resin binder and 10 to 60% by wt. relative to the total binder content, of a natural binder, the remainder being thickening and/or peeling and/or cross-linking agents present in an amount not exceeding 10% by wt. relative to the total binder content.
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 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2014.
- 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.