Patents by Inventor William H. Frank

William H. Frank 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).

  • Step signal
    Patent number: 6578663
    Abstract: A structural step including relatively moveable parts wherein pressure step contact therebetween generates an impact audible mechanical sound alarm in a selected decibel range.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: June 17, 2003
    Assignee: Green Bull, Inc.
    Inventors: Thomas J. Schmitt, William H. Frank
  • STEP SIGNAL
    Publication number: 20030057019
    Abstract: A structural step including relatively moveable parts wherein pressure step contact therebetween generates an impact audible mechanical sound alarm in a selected decibel range.
    Type: Application
    Filed: September 24, 2001
    Publication date: March 27, 2003
    Inventors: Thomas J. Schmitt, William H. Frank
  • Rung lock and latch assembly for an extension ladder
    Patent number: 5429207
    Abstract: A rung lock frame and a mechanical latching structural assembly for selectively releasably locking and releasably and augmentally latching a pair of adjacently positioned rungs of relatively slidable ladder sections of an extension ladder, the rung lock frame and latching structure including guide rib and inclined ramp arrangement to permit ready movement of said latching structure into and out of augmental latching position on the rung lock frame.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: July 4, 1995
    Assignee: Emerson Electric Co.
    Inventors: William H. Frank, Claude R. Wallick, Jr.
  • Ladder and method of construction therefor
    Patent number: 4177879
    Abstract: A ladder with elongated side rails each with a web with two broad surfaces, and rungs supported by and extending between the webs of the side rails at spaced locations, has rung brackets molded into and embracing the webs, each of the rung brackets having a rung receiving boss and a base part on one broad surface of the web and a pad part on the other broad surface, and tying members, integral with the base and pad parts, connecting the parts and extending into the web. In making the ladder, holes are formed in the webs at the rung locations and the rung brackets are molded in place in and through those holes.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: December 11, 1979
    Assignee: Emerson Electric Co.
    Inventor: William H. Frank