Patents by Inventor John Groh

John Groh 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: 6269581
    Abstract: Disclosed is a rifle scope that utilizes laser range-finding and microprocessor technology to eliminate the need for the shooter to calculate bullet-drop compensation. The scope includes a laser range finder that calculates the distance between the user and the target that is focused in the cross-hairs. The user simply enters the muzzle velocity, i.e. the bullet speed of his particular ammunition as well as the current altitude using pushbuttons located on the scope assembly. A microprocessor automatically calculates the distance that the bullet traveling at the dialed-in speed will drop while traveling the distance calculated by the laser range finder, taking into consideration reduced drag at higher altitudes and the weight of the bullet. Based upon this calculated value, a second LCD image cross-hair is superimposed in the scope's viewfinder, indicating the proper position at which to aim the rifle in order to achieve a direct hit.
    Type: Grant
    Filed: April 12, 1999
    Date of Patent: August 7, 2001
    Inventor: John Groh