Patents by Inventor Alfred R. Cooper

Alfred R. Cooper 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).

  • Method for fabricating buried waveguides
    Patent number: 4913717
    Abstract: A method for fabricating buried waveguides on a glass substrate which contains sodium ions includes the steps of masking the substrate, performing a field-assisted ion-exchange process at low temperature to form waveguides by exchanging silver ions for the sodium ions, and performing a field-assisted ion-exchange at low temperature to bury the waveguides by exchanging potassium ions. In a preferred embodiment, the silver ions and the potassium ions are exchanged from eutectic melts.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: April 3, 1990
    Assignee: Polaroid Corporation
    Inventor: Alfred R. Cooper