Process for the solvent-free manufacture of compound pyrotechnic products containing a thermosetting binder and products thus obtained, especially compound propellent powders
CA 1256702 A · Owner: Societe Nationale Des Poudres Et Explosifs · Inventors: Ragon, Philippe; Perotto, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
The present invention relates to the field of compound pyrotechnic products. The invention relates to a three-step solvent-free, process for the manufacture of compound pyrotechnic products containing a thermosetting binder obtained by reaction of a polyhydroxylated prepolymer with a diisocyanate, which process is characterized in that: - in a first step the said prepolymer is mixed with an energetic charge and with a quantity of diisocyanate representing 50 to 90% of the required stoichiometric quantity, - in a second step the remainder required to attain the said stoichiometric quantity is added and after, mixing, the pasty mixture thus obtained is extruded - in a third step the …
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
- Granted July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
- 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.