James F Boye Deceased78 Winslow St, Redwood City, CA 94063

7397904, Jul 8, 2008

May 11, 2005

11/127343

Gary Virshup - Cupertino CA, US
James Boye - Salt Lake City UT, US
Edward J. Seppi - Portola Valley CA, US
Heinrich Riem - Wettingen, CH
Govin Dasani - Epsom, GB
Edward Shapiro - Menlo Park CA, US

Varian Medical Systems Technologies, Inc. - Palo Alto CA

G21K 3/00

378156, 378158, 378159

Devices and methods for implementing selective, or asymmetric, attenuation of an x-ray beam. In one example, a filter is provided that is substantially in the form of a wedge where some portions of the filter are thicker, and thus provide greater attenuation, than other, thinner portions of the filter. The filter is situated between the target surface of the anode and the x-ray subject so that x-rays generated by the target pass through the filter before reaching the x-ray subject. Specifically, the filter is oriented so that the thicker portion of the filter receives the higher intensity portion of the x-ray beam, while the thinner portion of the filter receives the relatively lower intensity portion of the x-ray beam. Thus, the gain profile of the x-ray beam is flattened so that the intensity, or flux, of the x-ray beam is relatively uniform throughout a substantial portion of the beam profile.

7539286, May 26, 2009

Nov 19, 2007

11/942656

Steve Bandy - Sunnyvale CA, US
Gary F Virshup - Cupertino CA, US
Michael Curzon Green - Palo Alto CA, US
James Russell Boye - Salt Lake City UT, US
Dennis Runnoe - Salt Lake City UT, US
Robert Clark Treseder - Lynchburg VA, US
David Humber - Los Gatos CA, US

Varian Medical Systems, Inc. - Palo Alto CA

H01J 35/06

378136, 378121

A filament assembly for use in an x-ray emitting device or other filament-containing device is disclosed. In one embodiment, an x-ray tube is disclosed, including a vacuum enclosure that houses both an anode having a target surface, and a cathode positioned with respect to the anode. The cathode includes a filament assembly for emitting a beam of electrons during tube operation. The filament assembly comprises a heat sink and a plurality of filament segments. The filament segments are configured for simultaneous emission of an electron beam for impingement on the target surface of the anode, and are electrically connected in series. Each filament segment includes first and second end portions that are thermally connected to the heat sink, and a central portion that can be configured with a modified work function for preferential electron emission.

2016009, Mar 31, 2016

Sep 26, 2014

14/499045

- Palo Alto CA, US
Stephen G. Bandy - Sunnyvale CA, US
Michael C. Green - Palo Alto CA, US
Clifford K. Nishimoto - San Jose CA, US
James R. Boye - Salt Lake City UT, US

H01J 35/06
H01J 9/04

Embodiments include an X-ray cathode filament, filament system, process to manufacture the filament and process to use the filament, where the filament includes a planar substrate, such as of tungsten, having a top surface coated with a coating of carburized tungsten (e.g., WC) and thoria (ThO). A first electron beam is emitted from the coating through a thermionic effect at a first temperature, such as when the filament is heated to between 1700 and 1900 degrees Celsius by running an electrical current through the filament. At this temperature, a second electron beam may be caused by (1) a reaction that includes creating thorium (Th) in the coating, and (2) the thorium diffusing to uncoated surfaces of the substrate from which the second electron beam is emitted. The filament may also have slots forming a zipper shape, forming a square switchback shape, or forming a rectangular labyrinth shape to reduce the current required to heat the filament.