Aerosol-producing fire extinguishant
CA 2089901 C · Owner: Zhegrov, Evgeny Fedorovich · Inventors: Rodina, Nina Alexandrovna; Deruzhinsky, Vyacheslav Ivanovich; Pak, Zinovy Petrovich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
An aerosol-producing fire extinguishant containing potassium nitrate as an oxidant, plasticized nitrocellulose as a combustible binder and, additionally carbon as an, activator of decomposition of potassium nitrate said, components taken in the following ratios wt. - %:, Potassium nitrate - 40-70, Carbon - 5-15 Plasticized nitrocellulose - 15-55
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.
Why it's free to use
- Filed February 19, 1993 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2015.
- 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.