Patents by Inventor Thomas H. Holtgrefe, Sr.

Thomas H. Holtgrefe, Sr. 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: 7204053
    Abstract: A mole trap has a pair of spring-loaded jaws. A platform is pivotally connected to the jaws to limit the travel of the trap into the ground and to stabilize the trap on the ground when it is set. A lever assembly forces the jaws open. A trigger mechanism includes a clasp member configured to selectively hold the lever assembly in a set position. The trap may be positioned such that a portion of the trigger mechanism is on the ground above a mole burrow. The disturbance of a mole traveling beneath the trigger causes the clasp member to disengage the lever assembly, permitting the lever assembly to collapse, thereby permitting the jaws to close and destroy the animal.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: April 17, 2007
    Inventor: Thomas H. Holtgrefe, Sr.
  • Patent number: 7104005
    Abstract: A mole trap has a pair of spring-loaded jaws. A platform is pivotally connected to the jaws to limit the travel of the trap into the ground and to stabilize the trap on the ground when it is set. A lever assembly forces the jaws open and sets the trap. An adjustable trigger mechanism is positioned on the ground above a mole burrow. The disturbance of a mole traveling beneath the trigger causes the lever assembly to collapse, thereby permitting the jaws to close and destroy the animal.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: September 12, 2006
    Inventor: Thomas H. Holtgrefe, Sr.
  • Patent number: 4765087
    Abstract: The present invention includes a mole trap having a pair of spring-loaded jaws. A platform is pivotally connected to the jaws to limit the travel of the trap into the ground and to stabilize the trap on the ground when it is set. A lever assembly forces the jaws open and sets the trap when the lever reaches an off-center position. An adjustable trigger mechanism is positioned on the ground above a mole borrow. The vibration of a mole traveling beneath the trigger causes the lever assembly to move upward from the off-center position and the jaws to close and destroy the animal.
    Type: Grant
    Filed: June 10, 1987
    Date of Patent: August 23, 1988
    Inventor: Thomas H. Holtgrefe, Sr.