Heterogeneous foam materials
CA 2248178 C · Owner: Dyer, John Collins · Inventors: Shiveley, Thomas Michael; Stone, Keith Joseph; Dyer, John Collins
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a HIPE-derived heterogeneous polymeric foam structure of interconnected open-cells wherein the foam structure has at , least two distinct regions. Such heterogeneous foams have various applications, such as energy and fluid absorption insulation, and filtration. , The invention further relates to a heterogeneous absorbent plymeric foam that upon contact with aqueous fluids (in particular body fluids such as urine and blood), can acquire, distribute, and store these fluids. The foams of the invention have at least two distinct regions having different density polymer , composition, surface properties and/or microcellular morphology. The , invention …
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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 February 21, 1997 and granted November 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2019.
- 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.