Patents by Inventor Tetsuchi Kawamura

Tetsuchi Kawamura 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).

  • Water-soluble additives having extreme pressure effect for aqueous functional fluids, functional fluids and concentrated aqueous compositions containing the additives
    Patent number: 4880552
    Abstract: This invention relates to the use of water-soluble 3-mercaptopropionic acid disulphide salts as extreme pressure additives for aqueous functional fluids.These salts may be prepared by the oxidation of 3-mercaptopropionic acid followed by bringing the disulphide obtained into contact with an organic or inorganic base.Functional fluids are used during industrial operations such as, for example, the machining of metals.
    Type: Grant
    Filed: April 21, 1988
    Date of Patent: November 14, 1989
    Assignee: Societe Nationale Elf Aquitaine (Production)
    Inventors: Patrice Guesnet, Tetsuchi Kawamura, Gerard Savin, Sabine Poncet, Charles Castera