Patents by Inventor James Frederick Lau

James Frederick Lau 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).

  • Thin sheet mica wedges with semi-conducting properties
    Patent number: 7238404
    Abstract: The present invention provides for thin sheet wedges that comprise a mica matrix impregnated with a conductive resin. The mica matrix is composed of mica flakes. The thin sheet wedge has a semi-conductive property of 500–500,000 ohms per square. In one embodiment the thin sheet wedge further comprises at least one glass fiber layer. In a particular embodiment the glass fiber layer is a backing for the mica matrix. In another particular embodiment the glass fiber is interwoven with the mica matrix. The glass fiber layer may itself be impregnated with a conductive resin.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: July 3, 2007
    Assignee: Siemens Power Generation, Inc.
    Inventors: James Frederick Lau, Douglas James Conley
  • Method and system for on-line monitoring of bearing insulation in an electrical generator
    Patent number: 6799125
    Abstract: The present invention monitors an electrical generator (10) to provide an indication of a problem in the generator's bearing insulation (26), such as insulation damage or insulation bridging, and sets an alarm to warn an operator of the problem, thereby avoiding damage to the electrical generator (10). Methods and systems consistent with the present invention identify problems with bearing insulation (26) by monitoring the naturally occurring shaft voltage on the generator rotor (12) and by setting an alarm if the shaft voltage drops below a predetermined value.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: September 28, 2004
    Assignee: Siemens Westinghouse Power Corporation
    Inventors: James Frederick Lau, Abraham Nieves
  • Method and system for on-line monitoring of bearing insulation in an electrical generatior
    Publication number: 20040059523
    Abstract: The present invention monitors an electrical generator (10) to provide an indication of a problem in the generator's bearing insulation (26), such as insulation damage or insulation bridging, and sets an alarm to warn an operator of the problem, thereby avoiding damage to the electrical generator (10). Methods and systems consistent with the present invention identify problems with bearing insulation (26) by monitoring the naturally occurring shaft voltage on the generator rotor (12) and by setting an alarm if the shaft voltage drops below a predetermined value.
    Type: Application
    Filed: September 19, 2002
    Publication date: March 25, 2004
    Applicant: Siemens Westinghouse Power Corporation
    Inventors: James Frederick Lau, Abraham Nieves