Patents by Inventor Lydia Hallman

Lydia Hallman 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).

  • Method and composition for coating aluminum
    Patent number: 5125989
    Abstract: The invention is a composition and method for treating aluminum. The composition comprises phosphonic acid, fluorozirconic acid, fluorotitanic acid, fluorohafnic acid, or fluorosilicic acid and a Mannich adduct of an polyalkenyl phenol or tannin. The aluminum is treated by contact with the composition. An inorganic-organic conversion coating is applied to the aluminum in a single step.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: June 30, 1992
    Assignee: Henkel Corporation
    Inventor: Lydia Hallman
  • Method and composition for coating aluminum
    Patent number: 4992116
    Abstract: The invention is a composition and method for treating aluminum. The composition comprises phosphonic acid, fluorozirconic acid, fluorotitanic acid, fluorohafnic acid, or fluorosilicic acid and a Mannich adduct of an polyalkenyl phenol or tannin. The aluminum is treated by contact with the composition. An inorganic-organic conversion coating is applied to the aluminum in a single step.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: February 12, 1991
    Assignee: Henkel Corporation
    Inventor: Lydia Hallman