Hot melt adhesive having controlled property change
CA 2010280 C · Owner: H.B. Fuller Licensing & Financing, Inc. · Inventors: Ryan, Christopher M.; Bunnelle, William L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The novel adhesives of this invention contain a blend of components that result in the adhesive having a physical property that changes at a controlled rate as a function of time after application until it reaches a final equilibrium value. The adhesives can contain a thermoplastic polymer base a tackifying resin, and an aromatic plasticizer optionally in combination with other ingredients. The plasticizer tackifier combination is chosen such that the tackifier/plasticizer interaction causes the initial value of the physical property after application to change, at a controlled rate to a final, equilibrium level.
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 February 16, 1990 and granted October 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.