Patents by Inventor Edgar S. Hayman, Jr.

Edgar S. Hayman, Jr. 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).

  • Acid inhibitor composition and process in hydrofluoric acid chemical cleaning
    Patent number: 4104303
    Abstract: A Mannich base and thiourea inhibitor composition and method of inhibiting the acid attack by aqueous hydrofluoric acid on ferrous metal surfaces, and in particular, highly reactive ferrous metal surfaces.
    Type: Grant
    Filed: August 26, 1976
    Date of Patent: August 1, 1978
    Assignee: Amchem Products, Inc.
    Inventors: James Douglas Anderson, Edgar S. Hayman, Jr., Edward A. Rodzewich
  • Acid inhibitor composition and process in hydrofluoric acid chemical cleaning
    Patent number: 3992313
    Abstract: A Mannich base and thiourea inhibitor composition and method of inhibiting the acid attack by aqueous hydrofluoric acid on ferrous metal surfaces, and in particular, highly reactive ferrous metal surfaces.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: November 16, 1976
    Assignee: Amchem Products, Inc.
    Inventors: James Douglas Anderson, Edgar S. Hayman, Jr., Edward A. Rodzewich