Patents by Inventor Donald B. MacElwee

Donald B. MacElwee 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).

  • 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
  • Reduction of HF
    Publication number: 20030218148
    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: Application
    Filed: December 13, 2002
    Publication date: November 27, 2003
    Inventors: Harry E. Stewart, Donald B. MacElwee
  • Reduction of HF
    Publication number: 20010000911
    Abstract: The invention comprises a substantially non-aqueous, flame-extinguishing composition for extinguishing a fire at the sight of a potential flame comprising a fluorocarbon in admixture with a gelled powder additive comprising 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: Application
    Filed: January 8, 2001
    Publication date: May 10, 2001
    Inventors: Harry E. Stewart, Donald B. MacElwee
  • Fire extinguishers
    Patent number: 5909776
    Abstract: The linear type fire-extinguisher is modified to be fabricated from a synthetic polymeric resin, rupturable upon combustion to release a contained fire-extinguisher.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: June 8, 1999
    Assignee: Powsus Inc.
    Inventors: Harry E. Stewart, Donald B. MacElwee
  • Fire extinguishing gels and methods of preparation and use thereof
    Patent number: 5833874
    Abstract: Fire-extinguishing compositions of low ozone depletion potential comprise dry particles of fire-extinguishing agents dispersed in a gel of liquified volatile perfluorocarbons, chlorofluorocarbons or hydrofluorocarbons. The dry particles are compatibilized with the carrier gel by the presence of a surfactant system composed of a non-ionic surfactant, a film forming fluorocarbon surfactant and a phosphorus containing antiflocculent.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: November 10, 1998
    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