Patents by Inventor Eric Albert Ash

Eric Albert Ash 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).

  • Optical system using a hologram coupler
    Patent number: 4057319
    Abstract: An optical system in which individual connections are made involving the passage of light between a specific device in one array of optical devices and a specific device in another array of optical devices includes a phase halogram plate of the transmission type fixed relative to each array.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: November 8, 1977
    Assignee: National Research Development Corporation
    Inventors: Eric Albert Ash, Oliverio Delfim Dias Soares