Patents by Inventor Edward Alexander Hill

Edward Alexander Hill 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).

  • Apparatus for controlling iron content of a zinc phosphating bath
    Patent number: 3992300
    Abstract: An apparatus for controlling the iron content of a zinc phosphating process. The processing bath is continuously aerated and agitated to precipitate iron compounds out of solution and maintain the precipitate in suspension. The bath is constantly recirculated through a series of settling tanks or a single compartmentalized tank wherein the precipitate is settled out of solution and from which relatively clarified solution is discharged back to the processing bath. Periodically iron bearing sediment is removed from the settling tanks for disposal as solid waste.
    Type: Grant
    Filed: November 14, 1974
    Date of Patent: November 16, 1976
    Assignee: TRW Inc.
    Inventor: Edward Alexander Hill