Patents by Inventor John J. Russell, Jr.

John J. Russell, Jr. 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).

  • Treated toner magnetic carrier and method of making the same
    Patent number: 4268599
    Abstract: Method and means is disclosed for treating carrier particles in order to change the charge to mass ratio and the resistivity of a development powder encompassing such particles. The carrier particles are first coated with a polymer capable of providing reactive sites and then an additional treatment is carried out with a material that will react to the reactive sites. Another advantage of the treatment is that the carrier particles are protected from oxidation following such treatment.
    Type: Grant
    Filed: January 23, 1980
    Date of Patent: May 19, 1981
    Assignee: Pitney Bowes, Inc.
    Inventor: John J. Russell, Jr.
  • Electroscopic carrier particles having a carboxylic acid surface treatment
    Patent number: 4247597
    Abstract: Disclosed is a treatment of electroscopic carrier particles with a solution of non-halogenated carboxylic acids. Preferably, the carboxylic acid solution is first passed through a dry agent to assure its anhydrous nature. The carrier particles are added to and agitated within the solution a sufficient period to assume complete wetting of the particles. After decanting and filtering, the carrier particles are dried. Carrier particles treated in this manner are less susceptible to oxidation and have particular utility for use in development powders for magnetic brush development units of electrophotography copier equipment.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: January 27, 1981
    Assignee: Pitney Bowes, Inc.
    Inventor: John J. Russell, Jr.
  • Treated toner carrier and method of making the same
    Patent number: 4225660
    Abstract: Method and means is disclosed for treating carrier particles in order to change the charge to mass ratio and the resistivity of a development powder encompassing such particles. The carrier particles are first coated with a polymer capable of providing reactive sites and then an additional treatment is carried out with a material that will react to the reactive sites. Another advantage of the treatment is that the carrier particles are protected from oxidation following such treatment.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: September 30, 1980
    Assignee: Pitney Bowes Inc.
    Inventor: John J. Russell, Jr.