Patents by Inventor John Crowder

John Crowder 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).

  • Alkali metal dithionite manufacture
    Patent number: 3947559
    Abstract: A process for making an alkali metal dithionite by reacting sulphur dioxide with a basic alkali metal compound and one or both of formic acid and an alkali metal formate. The process is conducted in the presence of aqueous 2-methoxyethanol.
    Type: Grant
    Filed: March 29, 1974
    Date of Patent: March 30, 1976
    Inventors: Geoffrey Moorhouse Gibson, John Crowder