Patents by Inventor Clifford E. Kristofferson

Clifford E. Kristofferson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of preparing a non-feathering nitramine propellant
    Patent number: 4726919
    Abstract: A low vulnerability ammunition (LOVA) propellant is prepared with a polyurethane binder and a mixture of nitramines consisting essentially of RDX and at least 7.5 wt. % HMX (based on combined oxidizer binder matrix weight). Dilution of RDX with HMX enhances precure extrudability of the propellant grain. Polymerization and extrudability is provided without slumping prior to total cure given a NCO:DIOL:TRIOL equivalent ratio of from about 110:15:85.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: February 23, 1988
    Assignee: Morton Thiokol, Inc.
    Inventors: Clifford E. Kristofferson, Donald G. Fisher, Frank H. Bell
  • Solvent-free preparation of gun propellant formulations
    Patent number: 4650617
    Abstract: A solventless method for the preparation and storage of uncured low vulnerability ammunition propellant (LOVA) includes blending from about 60 to 80 weight percent of either HMX or RDX oxidizer having a weight mean diameter from 1.0 to 14 microns with a polyurethane binder. A cure effecting amount of cure catalyst may also be included. These ingredients are blended at a temperature below about 110.degree. F., deaired, and optionally stored at low temperatures at a pre-cured condition, extruded and subsequently cured. The products produced thereby have uniquely low burning rates as well as uniquely low burning rate exponents.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: March 17, 1987
    Assignee: Morton Thiokol Inc.
    Inventors: Clifford E. Kristofferson, Donald G. Fisher, Frank H. Bell, William F. Wagner
  • Low vulnerability gun propellant
    Patent number: 4506069
    Abstract: A prepolymer for use in preparing a binder for low vulnerability gun propellants. The condensation of an alkynediol and formaldehyde produces a prepolymer which is cured with a polyisocyanate. The resulting binder can be combined with 1,3,5,7-tetramethylenetetranitramine (HMX) or 1,3,5-trimethylenetrinitramine (RDX), and is readily extruded as multi-perforated propellant grains, the extruded material having a greatly reduced tendency to slumping, and an enhanced mass impetus value.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: March 19, 1985
    Assignee: Thiokol Corporation
    Inventors: Michael W. Barnes, Clifford E. Kristofferson, Anthony P. Manzara
  • Low vulnerability gun propellant
    Patent number: 4456493
    Abstract: A prepolymer for use in preparing a binder for low vulnerability gun propellants. The condensation of an alkynediol and formaldehyde produces a prepolymer which is cured with a polyisocyanate. The resulting binder can be combined with 1,3,5,7-tetramethylenetetranitramine (HMX) or 1,3,5-trimethylenetrinitramine (RDX), and is readily extruded as multi-perforated propellant grains, the extruded material having a greatly reduced tendency to slumping, and an enhanced mass impetus value.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: June 26, 1984
    Assignee: Thiokol Corporation
    Inventors: Michael W. Barnes, Clifford E. Kristofferson, Anthony P. Manzara