Patents Assigned to System Hygienics Limited
  • Method of cleaning the inside surface of ducts
    Patent number: 6402854
    Abstract: A method of cleaning the inside surface of a kitchen extraction duct or other grease duct, includes applying solid carbon dioxide under pressure to the inside surface of the duct, so that grease thereon is hardened and dislodged therefrom.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: June 11, 2002
    Assignee: System Hygienics Limited
    Inventor: Graham Horridge