Membrane, e.g. for use in an ileostomy bag
CA 2049654 C · Owner: Steer, Graham Emery · Inventors: Steer, Graham Emery
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making a gas-permeable liquid-impermeable membrane includes the steps of perforating a film of linear low density polyethylene (or other suitable polyolefin) in such a way as to yield an array of holes each having an, average diameter of approximately 350 and then solution coating the needled, film with a porous polyurethane material having pores of a pore size of 1 to . Such a film is advantageously embodied in an ileostomy bag and is fixed, to a bag wall thereof in a location to prevent faecal material contacting the ~ , bag filter, by a heat or RF wedding operation by which the polyolefin is welded, to the bag wall which carries the filter. In use the polyurethane is …
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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
- Filed August 21, 1991 and granted March 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2013.
- 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.