Wound dressing
CA 2017683 C · Owner: Ultra Laboratories Limited · Inventors: Andrews, Trevor John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a wound dressing comprising a pad of soft polyurethane foam one surface layer of which is hydrophilic and a backing layer of which is hydrophobic and a sheet or strip of a soft conformable polyether foam having an adhesive on one surface thereof. The surface of said pad opposite the hydrophobic layer is secured to said sheet or strip by said adhesive and said sheet or strip overlaps said pad to enable the pad to be secured in position with said hydrophilic layer in contact with a wound by means of said adhesive.
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 May 28, 1990 and granted September 6, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 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.