Strontium nitrate containing primer composition
CA 2027449 C · Owner: Ward, James P. · Inventors: Kees, Kenneth P.; Ells, Delbert O.; Ward, James P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
Primer composition comprising diazodinitrophenol or potassium dinitrobenzofuroxane, tetracene nitrate, ester fuel and strontium nitrate. It is prepared by hydrating anhydrous strontium nitrate by dissolving in warm water and thereafter cooling solution to obtain crystals of the tetrahydrate. These crystals are mixed with other components to form the primer composition.
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 October 12, 1990 and granted April 12, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2012.
- 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.