Patents by Inventor Gerald E. Griffin

Gerald E. Griffin 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).

  • Lighted plumb bob
    Patent number: 4625428
    Abstract: An improved plumb bob having a downwardly directed light beam to indicate the point directly below the plumb bob. The light is operated by batteries within the plumb bob and, in order to prevent undesired draining of the batteries, the light is switched on and off by the weight of the plumb bob acting on the line. The switch is activated by a conductive spring held within the plumb bob.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: December 2, 1986
    Inventor: Gerald E. Griffin