A film for medical use, consisting of linear block polymers of polyurethane and a method for the production of such a film
CA 2361439 A1 · Owner: Flodin, Per · Inventors: Flodin, Per; Gisselfalt, Katrin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention concerns a film for medical use consisting of linear block polymers of polyurethane urea containing hydrolysable ester groups. These ester groups must be so spaced from each other on the carbon chain that on their hydrolysis such small fragments are formed that they can be secreted from a human body or that of a mammal. The film is characterised in that it is porous with an average pore size of up to 600 µm. The invention also includes a procedure for the production of the film in which a solution of the film-forming polymers with a concentration of 5-30 % is applied as a thin layer on a surface after which the solvent is evaporated and/or the layer is treated …
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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 January 18, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 18, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2022.
- 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
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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.