Patents by Inventor Hugh S. Cooper, deceased

Hugh S. Cooper, deceased 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).

  • Process for producing alkali metal chromates and dichromates
    Patent number: 3932598
    Abstract: An improved process for producing alkali metal chromates and dichromates wherein ferrochrome alloy containing at least 1% carbon by weight is reacted with a molten mixture of an alkali metal nitrate and an alkali metal carbonate at a temperature of at least 350.degree.C. The ferrochrome alloy can be prepared by smelting chromite ore in the presence of carbon.
    Type: Grant
    Filed: April 24, 1970
    Date of Patent: January 13, 1976
    Inventors: Hugh S. Cooper, deceased, Henry J. Rand, executor