Patents by Inventor Manuel Fradique

Manuel Fradique 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).

  • Method of quenching metals
    Patent number: 4596612
    Abstract: A metal quenchant fluid which is a mixture of water and a polyalkylene glycol and a inhibitor is substantially nitrite free. The inhibitor is a soluble product obtained by mixing a carboxylic acid having 4 to 12 carbon atoms in the molecule, an amine such as an alkanolamine boiling above 150.degree. C. at atmospheric pressure and a copper chelating agent such as NN diethanol methylene benzotriazole.
    Type: Grant
    Filed: October 22, 1984
    Date of Patent: June 24, 1986
    Assignee: BP Chemicals Limited
    Inventor: Manuel Fradique