Patents by Inventor Terence B. Hadden

Terence B. Hadden 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 guide
    Patent number: 4179231
    Abstract: A tool guide, particularly for an electric hand drill, to affix to a drill and guide it in drilling a hole perpendicular to a surface. The guide has drill holding means which incorporates a manually adjustable locking mechanism which allows for the ready accommodation of drill bits of different sizes. The guide has also drill fixing means onto its drill holding means to instantly, firmly and independently hold the guide onto the drill during operation.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: December 18, 1979
    Inventor: Terence B. Hadden