Patents by Inventor William R. Rigby

William R. Rigby 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).

  • Porous films and method of forming them
    Patent number: 4687551
    Abstract: An anodic aluminum oxide film (12) has a system of larger pores (14) extending in from one face (16) and interconnecting with a system of smaller pores (24) extending in from the other face (26). The film is made by anodizing an aluminum metal substrate, then reducing the applied voltage at a rate to permit partial or complete recovery of the oxide film, either continuously or incrementally in small steps down to a level preferably below 3 V, and separating the oxide film from the substrate.
    Type: Grant
    Filed: October 10, 1985
    Date of Patent: August 18, 1987
    Assignee: Alcan International Limited
    Inventors: Robin C. Furneaux, William R. Rigby, Alexander P. Davidson