Patents Assigned to Rynex Holdings Ltd.
  • Dry cleaning solvents containing DPTB and other surfactants
    Patent number: 6673120
    Abstract: A method for dry-cleaning garments which comprises treating the garments with a mixture of dipropylene glycol tertiary-butyl ether (DPTB) and water for a period of time sufficient to effect dry-cleaning, wherein the weight ratio of DPTB to water is at least 9:1.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: January 6, 2004
    Assignee: Rynex Holdings, Ltd.
    Inventor: William A. Hayday
  • Solvent purifying system
    Patent number: 6524474
    Abstract: A solvent separator apparatus having a vertical accumulator tank with a top end and a bottom end, the accumulator tank being serially connected to a vertical reservoir tank having a top end and a bottom end; a down tube vertically positioned in the accumulator tank having a top end nearest the top end of the accumulator tank and a bottom end nearest the bottom end of the accumulator tank, with an inlet at the top end of the down tube and an outlet at the bottom end of the down tube; an inlet conduit connected to the inlet of the down tube, the inlet conduit entering the bottom end of the accumulator tank and defining an upward flow path within the accumulator tank to the inlet at the top end of the down tube; a heat exchanger in communication with the down tube for withdrawing heat therefrom; and a transfer conduit defining a downward flow path from the top end of the accumulator tank to the bottom end of the reservoir tank.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: February 25, 2003
    Assignee: Rynex Holdings Ltd.
    Inventor: William A. Hayday
  • Biodegradable ether dry cleaning solvent
    Patent number: 6350287
    Abstract: A method for dry-cleaning garments which comprises treating the garments with a mixture of dipropylene glycol tertiary-butyl ether (DPTB) and water for a period of time sufficient to effect dry-cleaning, wherein the weight ratio of DPTB to water is at least 9:1.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: February 26, 2002
    Assignee: Rynex Holdings, Ltd.
    Inventor: William A. Hayday
  • Biodegradable ether dry cleaning solvent
    Patent number: 6273919
    Abstract: A method for dry-cleaning garments which comprises treating the garments with a mixture of dipropylene glycol tertiary-butyl ether (DPTB) and water for a period of time sufficient to effect dry-cleaning, wherein the weight ratio of DPTB to water is at least 9:1.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: August 14, 2001
    Assignee: Rynex Holdings Ltd.
    Inventor: William A. Hayday
  • Biodegradable dry cleaning solvent
    Patent number: 6156074
    Abstract: A method of dry-cleaning garments which comprises treating the garments with a mixture of propylene glycol tertiary-butyl ether or propylene glycol n-butyl ether and water.
    Type: Grant
    Filed: January 12, 2000
    Date of Patent: December 5, 2000
    Assignee: Rynex Holdings, Ltd.
    Inventors: William A. Hayday, Stephen P. Bates
  • Biodegradable dry cleaning solvent
    Patent number: 5888250
    Abstract: A method for dry-cleaning garments which comprises treating them with an azeotropic solvent of propylene glycol tertiary-butyl ether and water.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: March 30, 1999
    Assignee: Rynex Holdings Ltd.
    Inventors: William A. Hayday, Stephen P. Bates