Patents by Inventor Da L Hao

Da L Hao 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).

  • Key light holder for key organization
    Patent number: 6106131
    Abstract: A key light holder for key organization has a key organizer device for organizing keys in key chain and a light device for illumination when the key is used in dark. The holder is a thin hard box having a round shape in top and square shape in bottom. The light device contained in the holder can be turned on and off. The key organizer device contained in the holder has a drawing back force when a pull out force applies to the device.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: August 22, 2000
    Inventor: Da L Hao