Patents by Inventor Elizabeth L. MacNamara

Elizabeth L. MacNamara 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).

  • Phosphate-free spray cleaner for metals
    Patent number: 4093566
    Abstract: Spray cleaner formulations useful in the surface treatment of metallic amition components and the like and comprising sodium metasilicate, sodium carbonate, and either sodium hydroxide or ethylenediamine tetraacetic acid, the cleaner formulation being completely devoid of phosphates such that the spent cleaning formulation, when discharged into waterways, will not promote algae growth therein or eutrophication thereof.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: June 6, 1978
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Elizabeth L. MacNamara, Fred Pearlstein