Patents by Inventor Philip Warrington

Philip Warrington 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).

  • Coating improvements
    Patent number: 4885069
    Abstract: A coating is formed on a substrate by sputter ion plating wherein a DC glow discharge is generated under soft vacuum conditions in the presence of the substrate and of a cathode constituted by the coating material thereby to release material at the cathode by ion bombardment, which released material diffuses to the substrate to form the coating thereon, and wherein a potential is applied to the substrate during coating.In order to control the coating, for example when it is an alloy containing Al and when the substrate has sharp edges, the potential is applied in the form of an AC bias of e.g. 20 to 200 volts wherein ion polishing occurs in the negative part of the cycle and retention of coating material in the positive part thereof.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: December 5, 1989
    Assignee: United Kingdom Atomic Energy Authority
    Inventors: Joseph P. Coad, David S. Rickerby, Philip Warrington