Patents by Inventor Kai C. A. Yau

Kai C. A. Yau 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).

  • Patent number: 5993022
    Abstract: A flashlight has a center pivot mechanical connection between a plastic battery housing and a rotatable plastic turret, permitting free rotation of the turret. A lamp housing is pivotable within the turret about an axis perpendicular to the center pivot. Electrical connection between the lamp within the lamp housing, and the batteries within the battery housing is provided by two pairs of ring and point contacts mounted to the turret and the battery housing, and by ring contacts connected to the lamp housing surrounding the pivot axis of the lamp housing which engage with a point contact and ring contact in the turret. The light may thus be pointed in any direction in the hemisphere above the battery housing. A snap ring securely retains the turret to the battery housing while permitting free rotation about the rigid center pivot which does not provide electrical connection.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: November 30, 1999
    Assignee: Rayovac Corporation
    Inventors: James U. Neyer, Kai C. A. Yau
  • Patent number: D336965
    Type: Grant
    Filed: December 24, 1991
    Date of Patent: June 29, 1993
    Assignee: Practical Products Mfg. Ltd.
    Inventor: Kai C. A. Yau
  • Patent number: D336966
    Type: Grant
    Filed: December 26, 1991
    Date of Patent: June 29, 1993
    Assignee: Practical Products Mfg. Ltd.
    Inventor: Kai C. A. Yau
  • Patent number: D349354
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: August 2, 1994
    Assignee: World Hint Limited
    Inventor: Kai C. A. Yau
  • Patent number: D349355
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: August 2, 1994
    Assignee: World Hint Limited
    Inventor: Kai C. A. Yau
  • Patent number: D356175
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: March 7, 1995
    Assignee: World Hint Limited
    Inventor: Kai C. A. Yau
  • Patent number: D401372
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: November 17, 1998
    Assignee: Rayovac Corporation
    Inventors: Kai C. A. Yau, Martin W. Wirt, Robert K. Kloppenburg, Jr.
  • Patent number: D411023
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: June 15, 1999
    Assignee: Rayovac Corporation
    Inventor: Kai C. A. Yau