Patents by Inventor Henry Lon Eisenson

Henry Lon Eisenson 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).

  • Battery operated device with a battery life indicator
    Patent number: 7295129
    Abstract: A countdown timer for high performance flashlights and similar battery-operated devices that is initialized with a runtime figure equal to the life expectancy of installed linear depletion-curve cells, that is always on and visible, that counts down whenever the flashlight is switched to the ON position, and that displays time remaining until the installed cells/charge are depleted, thus permitting the user to see at a glance the approximate runtime remaining on the installed power supply.
    Type: Grant
    Filed: April 11, 2006
    Date of Patent: November 13, 2007
    Inventor: Henry Lon Eisenson