Patents by Inventor Raymond O. Dannenberg

Raymond O. Dannenberg 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).

  • Preparation of hydrosulfides
    Patent number: 4156656
    Abstract: Hydrosulfides of sodium, potassium, calcium, barium and strontium are prepared by reaction of the oxide or hydroxide of the metal with sulfur in aqueous medium at elevated temperature and pressure.
    Type: Grant
    Filed: June 13, 1978
    Date of Patent: May 29, 1979
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Raymond O. Dannenberg, Henry Dolezal