Heat-activatable polyurethane coatings and their use as adhesives
CA 2344340 A1 · Owner: Gringoire, Bruno R. L. · Inventors: Keller, Lajos E.; Leger, Christian; Gringoire, Bruno R. L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coated sheet has a heat-activatable adhesive coating of thermoplastic polyurethane having a melting point of 40 to 100 ~C. The coating may be crystalline and have an average crystal size below 10 µm. The coating when , molten, may remain tacky for a period of from 2 to 50 seconds. Preferred processes comprise heat activating the coating and subsequently cold or cool sealing, for instance to form a packet around a heat-sensitive material.
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 September 14, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 14, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2021.
- 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.