Patents by Inventor Thomas E. Chalmers

Thomas E. Chalmers 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).

  • Etching of aluminum electrolytic capacitor foil
    Patent number: 4584067
    Abstract: Aluminum electrolytic capacitor foil is etched by first subjecting high-cubicity foil to a chemical etching stage in which the etchant is an acidic aqueous solution containing an acid having anions for anodizing aluminum, hydrochloric acid, transition metal ions, and aluminum ions. Preferably, the anodizing anions are present in a greater concentration than the chloride ions. The foil is then subjected to a second etching step which may be chemical or electrochemical. The process produces a high capacitance foil with high bend strength.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: April 22, 1986
    Assignee: Sprague Electric Company
    Inventors: Clinton E. Hutchins, Derek E. Rougeau, Thomas E. Chalmers, Richard A. Bemis