Patents by Inventor William C. Henderson, III

William C. Henderson, III 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).

  • Asymmetrical radiation exposure of spin coated photoresist to obtain uniform thickness coating used to replicate spiral grooves in plastic substrate
    Patent number: 4306013
    Abstract: An improved method for replicating a spiral groove pattern. The pattern is recorded in a photoresist layer which is then developed to reproduce the pattern in the photoresist layer. The pattern is transferred to a metal layer and formed in the surface of a plastic substrate. The improvement comprises the additional steps of asymmetrically irradiating the photoresist layer and removing the irradiated photoresist surface layer to produce a photoresist layer of uniform thickness.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: December 15, 1981
    Assignee: RCA Corporation
    Inventors: William R. Roach, William C. Henderson, III