Patents Assigned to Powsus, Inc.
  • Reduction of HF
    Patent number: 6736989
    Abstract: The invention provides for a substantially non-aqueous, flame extinguishing composition for extinguishing a fire at the sight of a potential flame having a flurocarbon in admixture with a gelled powder additive having salts of weak acids which decompose at the temperature of the sight to reduce or eliminate HF released by the composition when used to extinguish flames.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: May 18, 2004
    Assignee: Powsus, Inc.
    Inventors: Harry E. Stewart, Donald B. MacElwee
  • Fire extinguishing compositions
    Patent number: 5466386
    Abstract: Fire-extinguishing compositions of low ozone depletion potential comprise dry particles of ammonium bromide coated with an abherent such as zinc stearate to improve flowability. The coated particles enhance the fire-extinguishing properties of chlorofluorocarbons and halogenated paraffins having low ozone depletion properties, when dispersed therein.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: November 14, 1995
    Assignee: POWSUS, Inc.
    Inventors: Harry E. Stewart, Donald B. MacElwee
  • Fire extinguishing compositions
    Patent number: 5055208
    Abstract: Fire-extinguishing compositions of low ozone depletion potential comprise dry powder extinguishing agents and bromodichloromethane or dichlorotrifluoroethane.
    Type: Grant
    Filed: January 2, 1991
    Date of Patent: October 8, 1991
    Assignee: Powsus, Inc.
    Inventors: Harry E. Stewart, Donald B. MacElwee