Compositions for polar solvent fire fighting containing perfluoroalkyl terminated co-oligomer concentrates and polysaccharides
CA 2072291 C · Owner: Chang, H. Jho · Inventors: Clark, Kirtland P.; Jacobson, Michael; Chang, H. Jho
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Co-oligmers of the formula, R f-E m-(S)n-M1x-M2y-H and mixtures thereof, wherein, R f is a perfluoroalkyl group E is a linkage group, M1 represents a non-ionic hydrophilic monomer unit M2 represents an anionic hydrophilic monomer unit n and m are optionally 0 or 1, and, x and y represent the number of monomer units present in the novel cooligomers, the sum, of x and y being between 5 and 200 and y/(x+y) being between 0.01 and 0.98; are useful as additives in polar-solvent fire-fighting compositions when used in, conjunction with polysaccharides and other adjuvants. They improve dynamic foam stability and vapor suppressing ability of the foam thereby, reducing the flammability of polar …
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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 June 25, 1992 and granted February 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2014.
- 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.