Patents by Inventor Douglas Barrows

Douglas Barrows 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).

  • Water powered impulsive unit
    Patent number: 8033343
    Abstract: An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: October 11, 2011
    Assignee: Glencross Limited
    Inventors: Alan Barrows, Douglas Barrows
  • Water Powered Impulsive Unit
    Publication number: 20090101378
    Abstract: An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.
    Type: Application
    Filed: September 7, 2006
    Publication date: April 23, 2009
    Applicant: Glencross Limited
    Inventors: Alan Barrows, Douglas Barrows