Patents by Inventor Ralph Eldridge Walker

Ralph Eldridge Walker 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).

  • Floating head encoder
    Patent number: 4075478
    Abstract: An optical encoder design is disclosed which maintains a constant fixed air gap between the commutator and light sensors. The encoder head is mounted on a partially compressed hollow bellows or other spring member biasing snubber posts adjacent to the light sensors against tracks on the commutator. The height of the snubber posts above the light sensors defines the air gap.
    Type: Grant
    Filed: June 3, 1976
    Date of Patent: February 21, 1978
    Assignee: Litton Systems, Inc.
    Inventor: Ralph Eldridge Walker