Patents by Inventor Anthony A. Loffredo

Anthony A. Loffredo 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).

  • Patent number: 5006608
    Abstract: The molecular weight and the thickening efficiency of primarily oil soluble hydrocarbon polymers, such as hydrogenated random copolymers and block copolymers of styrene-isoprene or styrene-butadiene, polyisobutylene, poly-n-butene, low unsaturation butyl rubbers, low unsaturation EPDM rubbers, preferably ethylene-propylene copolymers, of the type which are to be used as viscosity index improver additives or as precursors for dispersants and multi-functional viscosity improver additives for lubricating oils, are reduced by heating and masticating the polymers in the presence of oxygen or air and in the presence of a transition metal catalyst, preferably in the further presence of a peroxide accelerator.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: April 9, 1991
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: John B. Gardiner, Anthony A. Loffredo, ricardo Bloch, Nicholas C. Nahas, Keith U. Ingold, Theodore V. Kowalchyn