Patents by Inventor Dennis J. Park

Dennis J. Park 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).

  • Energetic binder and thermoplastic elastomer-based low vulnerability ammunition gun propellants with improved mechanical properties
    Patent number: 5540794
    Abstract: An energetic binder system useful for making TPE-LOVA propellants and energetic composites comprises at least one thermoplastic elastomer, at least one plasticizer, and nitrocellulose.
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: July 30, 1996
    Assignee: Thiokol Corporation
    Inventors: Rodney L. Willer, Dennis J. Park
  • Method of making hydroxyamine and products therefrom
    Patent number: 5472679
    Abstract: The present invention concerns a method for making energetic oxidizer salts and solutions thereof, and in particular relates to processes for making aqueous solutions of hydroxylammonium nitrate in high purity suitable for use in making liquid gun propellants. The present alcohol-free process yields high purity alcohol-free hydroxylammonium nitrate by neutralizing an aqueous nitric acid solution (20-70% wt./wt.) with an alcohol-free aqueous hydroxylamine solution at temperatures ranging from above -50.degree. C. to substantially less than ambient (20.degree. C.) to produce the desired alcohol-free aqueous hydroxylammonium nitrate solution in a usable concentration and in high purity. The process is economical, environmentally acceptable, and facile.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: December 5, 1995
    Assignee: Thiokol Corporation
    Inventors: Michael L. Levinthal, Rodney L. Willer, Dennis J. Park, Ronnelle Bridges
  • 3-nitramino-4-nitrofurazan and salts thereof
    Patent number: 5460669
    Abstract: The energetic salts of 3-nitramino-4-nitrofurazan have a desirable combination of desirable properties such as sufficiently high densities, and low or no hydrogen content. The salts are useful as ingredients in various propellant, explosive, gassifier, and pyrotechnic compositions. 3-Nitramino-4-nitrofurazan is itself a useful energetic compound and is also useful in the synthesis of still further energetic compounds.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: October 24, 1995
    Assignee: Thiokol Corporation
    Inventors: Rodney L. Willer, Robert S. Day, Dennis J. Park, deceased
  • Process for making high purity hydroxylammonium nitrate
    Patent number: 5266290
    Abstract: The present invention pertains to a method for making energetic oxidizer salts and solutions thereof, and in particular relates to processes for making aqueous solutions of hydroxylammonium nitrate in high purity suitable for use in making liquid gun propellants. The present alcohol-free process yields high purity alcohol-free hydroxylammonium nitrate in a simple chemical neutralization reaction by combining an aqueous nitric acid solution 120 to 70 wt. %) with an alcohol-free aqueous hydroxylamine solution at temperatures ranging from about -50.degree. C. to above ambient to produce the desired alcohol-free aqueous hydroxylammonium nitrate solution in a usable concentration and in high purity. The process is economical, environmentally acceptable, and facile.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: November 30, 1993
    Assignee: Thiokol Corporation
    Inventors: Michael L. Levinthal, Rodney L. Willer, Dennis J. Park, Ronnelle Bridges