Patents by Inventor Cliff Keithley

Cliff Keithley 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).

  • Extruded aluminum sign frame section
    Patent number: 4771559
    Abstract: A frame for mounting a flexible sign and said brake comprising an arrangement of extruded aluminum frame members of relatively simple arrangement.
    Type: Grant
    Filed: January 8, 1986
    Date of Patent: September 20, 1988
    Inventor: Cliff Keithley
  • Extruded aluminum sign frame section
    Patent number: 4674213
    Abstract: An extruded sign frame section for use with flexible sign facing. The flexible sign face material (2) is secured by gripping element (8), the gripping element hooking onto knob (29) and permitting the material (2) to be stretched tautly across the sign frame (3). In a preferred embodiment, the extrusion includes a stabilizing element (24) which abuts the material (2), tending to dampen vibration of the sign face when subjected to wind loading. In another embodiment, an inclined member (34) permits the sign face material to be stretched across the frame (31) so as to conceal the extrusion, thereby giving the sign a borderless appearance.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: June 23, 1987
    Inventor: Cliff Keithley