Adhesive material
CA 1083434 A · Owner: Smith & Nephew Research Limited · Inventors: Walter, Brian W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for making a water vapour permeable pressure sensitive adhesive material which comprises forming on a surface which is poorly wettable or non-wettable by water, a continuous coating of an aqueous emulsion based pressure sensitive adhesive having dispersed therein a water immiscible organic liquid which is more volatile than water and which does not break the emulsion; leaving the coating at room temperature until pores develop and reach an average diameter of at least 100 microns; drying the coating at a higher temperature, and transferring the adhesive mass to a water vapour permeable backing material. The pore sizes of the water vapour permeable …
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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
- Granted August 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 12, 1997.
- 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.