Patents by Inventor Tatiana A. Arefieva

Tatiana A. Arefieva 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 making magnetic fluid
    Patent number: 7387744
    Abstract: The present approach pertains to colloidal chemistry and methods of manufacturing magnetic fluid such as ferrofluid. In particular, the present approach is directed to methods of manufacturing magnetic fluid that is resistant to aggregation and clumping, and is more stable over time. The process according to the present approach comprises sedimentation of magnetic particles; mixing the magnetic particles with an aqueous acetic acid solution, a surface-active agent and a polarizing composition; applying pulsed magnetic fields; removing excess surface-active agents and polarizing composition; ferrite desalination; and peptization of the surface-active agent in a non-polar, dispersing fluid. Magnetic fluids made according to the process of the present approach can be used, e.g., for ferrofluidic seals, inclinometers, accelerometers, or as magnetic lubricants.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: June 17, 2008
    Assignee: Ferrolabs, Inc.
    Inventors: Yuri O. Mikhalev, Tatiana A. Arefieva
  • Method of making magnetic fluid
    Patent number: 7291287
    Abstract: The present approach pertains to colloidal chemistry and methods of manufacturing magnetic fluid such as ferrofluid. In particular, the present approach is directed to methods of manufacturing magnetic fluid that is resistant to aggregation and clumping, and is more stable over time. The process according to the present approach comprises sedimentation of magnetic particles; mixing the magnetic particles with an aqueous acetic acid solution, a surface-active agent and a polarizing composition; applying pulsed magnetic fields; removing excess surface-active agents and polarizing composition; ferrite desalination; and peptization of the surface-active agent in a non-polar, dispersing fluid. Magnetic fluids made according to the process of the present approach can be used, e.g., for ferrofluidic seals, inclinometers, accelerometers, or as magnetic lubricants.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: November 6, 2007
    Assignee: Ferrolabs, Inc.
    Inventors: Yuri O. Mikhalev, Tatiana A. Arefieva
  • Method of making magnetic fluid
    Publication number: 20060266974
    Abstract: The present approach pertains to colloidal chemistry and methods of manufacturing magnetic fluid such as ferrofluid. In particular, the present approach is directed to methods of manufacturing magnetic fluid that is resistant to aggregation and clumping, and is more stable over time. The process according to the present approach comprises sedimentation of magnetic particles; mixing the magnetic particles with an aqueous acetic acid solution, a surface-active agent and a polarizing composition; applying pulsed magnetic fields; removing excess surface-active agents and polarizing composition; ferrite desalination; and peptization of the surface-active agent in a non-polar, dispersing fluid. Magnetic fluids made according to the process of the present approach can be used, e.g., for ferrofluidic seals, inclinometers, accelerometers, or as magnetic lubricants.
    Type: Application
    Filed: May 25, 2005
    Publication date: November 30, 2006
    Inventors: Yuri Mikhalev, Tatiana Arefieva