Patents by Inventor Frederick L. Marsh

Frederick L. Marsh 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).

  • Patent number: 5352549
    Abstract: A co-doped lead oxide for use in the manufacture of storage battery plates, the use of such lead oxides improving the efficiency of lead-acid batteries, comprising, as co-dopants, based upon the total weight of the lead oxide, copper in an amount of from about 0.01 to 0.1% and either tin in an amount of from about 0.008 to 0.1% or antimony in an amount of from about 0.005 to 0.08%.
    Type: Grant
    Filed: August 19, 1992
    Date of Patent: October 4, 1994
    Assignee: GNB Battery Technologies Inc.
    Inventors: Purushothama Rao, Frederick L. Marsh
  • Patent number: 4713304
    Abstract: A method for preparing lead-acid battery positive and negative plates for use in lead-acid batteries, comprising (a) providing battery grids, (b) applying wet leady oxide paste to the grids to form plates, (c) optionally wrapping the freshly pasted plates with an absorbent material, and (d) initiating formation of the lead-acid battery plates while the plates contain more than about 5 wt. % free lead in the paste and are generally damp from moisture existing in the paste from the time of plate pasting. Although conventional curing and drying of the plates is obviated and the plate formation is initiated merely hours after plate pasting, instead of a day or more after plate pasting as is the case with conventional battery plate processing, the cells and batteries containing plates prepared in accordance with the present invention exhibit a mechanical strength and deliver an overall electrical performance equivalent or superior to cells and batteries containing conventionally prepared plates.
    Type: Grant
    Filed: June 18, 1986
    Date of Patent: December 15, 1987
    Assignee: GNB Incorporated
    Inventors: Purushothama Rao, Frederick L. Marsh
  • Patent number: 4329408
    Abstract: A lead oxide for use in making an active material for pasted lead-acid battery plates comprises a doped lead oxide, the dopant preferably being copper in an amount of about 0.01 to about 0.07 percent based upon the total weight of the lead oxide. The use of such a doped oxide imparts to the resulting battery improvement in various of the electrical performance characteristics such as, for example, internal resistance, capacity, cycle life and the like.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: May 11, 1982
    Assignee: Gould Inc.
    Inventors: George W. Mao, Purushothama Rao, Frederick L. Marsh, Francis M. Dunlevey