Patents by Inventor George Brana

George Brana 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).

  • Carrier particles having the surface thereof treated with perfluoro sulfonic acid and method of making the same
    Patent number: 4113641
    Abstract: It has been found that unexpectedly high charge to mass ratios may be achieved in a development powder if the carrier particle of the development powder is treated with a perfluoroalkyl sulfonic acid. Treating carrier particles with a monolayer of such an acid has produced charge to mass ratios of 20 to 26 .times. 10.sup.-6 coulombs/gm. The acid concentration in of the solution used in this treatment has been found to be critical.
    Type: Grant
    Filed: October 7, 1977
    Date of Patent: September 12, 1978
    Assignee: Pitney-Bowes, Inc.
    Inventors: George Brana, John J. Russell
  • Treated ferromagnetic carrier particles for development powders
    Patent number: 4071655
    Abstract: Carrier particles of development powders are treated with a sodium salt of polystyrene sulfonic acid. As a result of the treatment, the triboelectric properties of the carrier particles are better controlled.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: January 31, 1978
    Assignee: Pitney-Bowes, Inc.
    Inventors: George Brana, Bheema Rao Vijayendran