Patents Assigned to Rigaku/USA, Inc.
  • Rotary motion feedthrough device
    Patent number: 6199867
    Abstract: A rotary motion feedthrough is described for coupling rotary motion from a rotatable shaft between an atmospheric side to a vacuum side by providing a dynamic magnetic seal of ferrofluid about the shaft using a non-rotating magnetic system formed of a unitary pole piece with magnets contained in radial slots formed in an inner diameter of the pole piece opposite the shaft.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: March 13, 2001
    Assignee: Rigaku/USA, Inc.
    Inventors: David G. Mahoney, Walter Helgeland
  • Unrestricted motion apparatus and method for x-ray diffraction analysis
    Patent number: 6064717
    Abstract: An unrestricted motion device (10) has a sample holder (12), a detector holder (14) capable of independent multi-dimensional movement, a radiation source (16) and a radiation source holder (42) also capable of independent, multi-dimensional movement. In a preferred embodiment, the radiation source (16) is an x-ray tube. A controller (18) is connected to the sample holder (12) and detector holder (14) as well as to radiation source (16) so as to enable control of the independent movement of the sample holder (12) and detector holder (14), as well as operation of radiation source (16) and independent movement of radiation source (16). So long as any two of the sample holder (12), detector holder (14) or radiation source holder (42) are capable of multi-dimensional, independent movement, the entire diffraction cone (40) can be observed and analyzed. In a preferred embodiment, the holders are robots.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: May 16, 2000
    Assignee: Rigaku/USA, Inc.
    Inventors: Richard Ortega, Delrose Winter
  • Rotary motion feedthrough with rotating magnet system
    Patent number: 5975536
    Abstract: A rotary motion feedthrough for coupling rotary motion from a rotatable shaft between an atmospheric side to a vacuum side includes a dynamic magnetic seal formed of magnets separated by pole rings which rings are formed integral with the shaft to form a magnetic system which rotates with the shaft.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: November 2, 1999
    Assignee: Rigaku/USA, Inc.
    Inventor: Walter Helgeland
  • Magnetic fluid sealing device
    Patent number: 5826885
    Abstract: A magnetic fluid sealing device adapted to enable rotary motion to be coupled by a shaft between an ambient high pressure environment to a high temperature, low pressure environment. Gaps in the shaft are dynamically sealed by a magnetic seal which uses a thin walled pole piece, a high power magnet and magnetic fluid. The pole piece and an extension thereof form a vacuum envelope for the remainder of the device, eliminating the need for the usual O-ring static seals.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: October 27, 1998
    Assignee: Rigaku/USA, Inc.
    Inventor: Walter Helgeland