Method of applying adhesive to porous materials
CA 2120111 C · Owner: Astechnologies, Inc. · Inventors: Elliott, George M.; Simmons, F. Arthur; King, Douglas D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of coating foam or fibrous material with an adhesive which will reactivate. A belt has a top surface which is coated with a release agent. The adhesive is applied on the release agent coated top surface of the belt as the belt is advanced along a predetermined path. The adhesive is plasticized in a preheating station after which the foam or fibrous material is placed on the belt in contact with the adhesive. The adhesive is activated by additional heat at a heating station causing the material to become coated with adhesive. At a cooling station, the adhesive is resolidified to release it from the belt and permit the adhesive coated material to be removed from the belt.
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 March 28, 1994 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2016.
- 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.