Patents by Inventor Louis N. Sparling

Louis N. Sparling 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).

  • Patent number: 5445109
    Abstract: The selective bird feeder (10) has a bird feed container (12) and a bird feed container cover (70). The bird feed container (12) has an open top (24 ) and bird feed access openings ( 32 ) . The bird feed container cover has a roof (72) and outer walls (76, 79, 80, and 82). Bird perch assemblies (84, 86) are attached to the outer walls (78, 82). A spring follower (74) with a vertical bore (94) is integral with the bird feed container cover (70). A vertical tube (48) is secured to the bird feed container (12) and extends upward through the vertical bore (94). A cap (108) is attached to the vertical tube (48) by a pin (110). A coil compression spring (68), inside the vertical tube (48), exerts a force on an adjustable lower spring abutment (50) and spring abutment surfaces (104) and (106) on radial projections (96, 98) that are integral with the spring follower (74) and extend through vertical slots (100, 102) in the vertical tube.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: August 29, 1995
    Inventors: Donald F. Gray, Louis N. Sparling