Patents by Inventor Lawrence Randlett

Lawrence Randlett 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).

  • Mining roof support cylinder corrosion protection apparatus and method
    Publication number: 20070160428
    Abstract: A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and said hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.
    Type: Application
    Filed: March 16, 2007
    Publication date: July 12, 2007
    Applicant: Avistar, Inc.
    Inventors: Lawrence Randlett, Steven Willard
  • Mining roof support cylinder corrosion protection apparatus and method
    Publication number: 20060214496
    Abstract: A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and said hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.
    Type: Application
    Filed: March 22, 2005
    Publication date: September 28, 2006
    Applicant: Avistar, Inc.
    Inventors: Lawrence Randlett, Steven Willard