Patents by Inventor Constance E. Erdman

Constance E. Erdman 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).

  • Inhibiting the corrosion of hair conditioning compositions
    Patent number: 4720382
    Abstract: Asymmetrical diesters of orthophosphoric acid are added to corrosive hair conditioning compositions to inhibit corrosion of metal coming into contact with the composition. The hair conditioning properties of the hair conditioning compositions are not adversely affected.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: January 19, 1988
    Assignee: S. C. Johnson & Son, Inc.
    Inventors: Constance E. Erdman, W. Stephen Tait
  • Method of eliminating the corrosivity of hair conditioning compositions
    Patent number: 4716037
    Abstract: The addition of a quaternary ammonium phosphate compound to hair conditioning compositions substantially prevents corrosion to stainless steel manufacturing equipment employed in the preparation of the hair conditioners.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: December 29, 1987
    Assignee: S. C. Johnson & Son, Inc.
    Inventors: Constance E. Erdman, Timothy J. Padden