Patents by Inventor Horace Earl Hill

Horace Earl Hill 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).

  • Drill stop
    Patent number: 4019827
    Abstract: A housing to fit over a drill contains a pair of sleeves with facing inclined surfaces that approach each other to force a washer located between the surfaces into an inclined position to lock onto the drill. A spring located on each side of the washer extends to the adjacent sleeve.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: April 26, 1977
    Assignee: The Boeing Company
    Inventors: Merrill Andrew Christianson, Horace Earl Hill