Patents by Inventor David Brankling

David Brankling 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).

  • Polymer composition viscosity index improver additive and lubricating oil containing the additive
    Patent number: 4194057
    Abstract: A viscosity index improver additive composition contains, as one component, a vinyl aromatic/conjugated diene polymer of specific structure and composition and, as a second component an ethylene/C.sub.3 to C.sub.18 alpha olefin copolymer of specific composition and viscosity. Preferably the composition also contains a polybutene of defined molecular weight.
    Type: Grant
    Filed: May 17, 1978
    Date of Patent: March 18, 1980
    Assignee: Orobis Limited
    Inventors: David Brankling, John Crawford