Transparent laminates
CA 2005969 A1 · Owner: Muller, Hans-Peter · Inventors: Hassel, Tillmann; Muller, Hans-Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Transparent laminates, Abstract, Novel laminates comprise transparent polymers with a high content of hydroxyl groups as core layer and adhesive layers applied to one or both sides which are tack-free under normal conditions and which can accept an outer layer, thermoplastic polyurethane-polyureas having a substantially linear molecular structure with exclusively aliphatically or cycloaliphatically bonded urethane segments and urea segments and a content of urea groups -NH-CO-NH- of 1 to 20% by weight and a content of carboxyl groups -COOH bonded directly to the main chain of the molecule in lateral positions, of 0.001 to 10% by weight, being used as adhesive layers. Le A 26 253
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 December 19, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2011.
- 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.