Patents Assigned to Societe National des Poudres et Explosifs
  • Inorganic resins, process for their preparation and materials for heat protection
    Patent number: 5532196
    Abstract: The invention relates to new curable inorganic resins based on alkali metal boroaluminosilicates, which, before curing, include inorganic elements in the reactive state, in the following proportions, expressed as their molar ratio of oxides:2.ltoreq.SiO.sub.2 /Al.sub.2 O.sub.3 .ltoreq.41.3.ltoreq.X.sub.2 O/Al.sub.2 O.sub.3 .ltoreq.3.810.ltoreq.H.sub.2 O/Al.sub.2 O.sub.3 .ltoreq.280.5<B.sub.2 O.sub.3 /Al.sub.2 O.sub.3 .ltoreq.2.0X.sub.2 O denoting one or more alkali metal oxides chosen from Na.sub.2 O, K.sub.2 O, Li.sub.2 O, and optionally fillers.The invention also relates to the process for the preparation of these new inorganic resins.The cured resins obtained are very useful for manufacturing heat protection materials.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: July 2, 1996
    Assignee: Societe National Des Poudres et Explosifs
    Inventors: Claude L'Hernault, Ludovic Neel
  • Process of selective bioconversion of isosorbitol dinitrate
    Patent number: 4897351
    Abstract: The invention relates to a process of selective bioconversion of DINIS into MONIS-5, wherein the DINIS is added to a medium containing at least one microorganism possessing a glutathion transferase or an acellular extract of such a microorganism.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: January 30, 1990
    Assignees: Societe National des Poudres et Explosifs, Centre National de la Recherche Scientifique
    Inventors: Maryse Lenfant, Jacek Ropenga, Eric Wimmer
  • Polymer with ethylenic unsaturations incorporating silylmetallocene groups, process for the manufacture of this polymer, and propellant composition having this polymer as a binder
    Patent number: 4647628
    Abstract: The invention relates to a polymer with ethylenic unsaturations incorporating silylmetallocene groups, a process for the manufacture of these polymers and a propellant composition having the polymer of the invention as a binder.The polymer of the invention incorporates ethylenic unsaturations, to at least some of which there are added silylmetallocene groups of formula ##STR1## in which M denotes a transistion metal such as, for example, iron, the radicals R.sub.1, R.sub.2 and R.sub.3 being hydrocarbon 2 radicals. The polymer may be a hydroxytelechelic or carboxytelechelic polybutadiene. This modified polymer is employed as a binder in composite propellant compositions, thus making it possible to solve the problem related to the migration of the combustion catalyst.The invention has application particularly in the field of solid propulsion.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: March 3, 1987
    Assignee: Societe National des Poudres et Explosifs
    Inventors: Jean-Claude C. Gautier, Michel H. Fontanille, Serge F. Raynal
  • Device for manufacturing articles of compacted powder
    Patent number: 4330251
    Abstract: A method and a mould for manufacturing articles of compacted powder by isostatic compression of powder in a mould, which is made of flexible material of substantially constant thickness and is substantially barrel-shaped, the mould having at one end a bottom made integral with the rest of the mould and being adapted to be closed by a separate plug at its other end.
    Type: Grant
    Filed: September 5, 1979
    Date of Patent: May 18, 1982
    Assignees: Basset Bretagne Loire-BBL, Societe National des Poudres et Explosifs
    Inventors: Jean-Marie Lebas, Pierre Rat, Jean-Marcel Dupont, Germain Vinuesa