Robert C Treseder

US Patent:

7593509, Sep 22, 2009

Filed:

Sep 27, 2007

Appl. No.:

11/863124

Inventors:

John Richardson - Layton UT, US
Robert Treseder - Lynchburg VA, US

Assignee:

Varian Medical Systems, Inc. - Palo Alto CA

International Classification:

H01J 35/08
H01J 35/14

US Classification:

378137, 378121, 378143

Abstract:

In one example, an x-ray device is provided that includes an enclosure having an x-ray transmissive window. A cathode assembly that includes an electron source capable of emitting electrons is disposed within the enclosure. An anode is also disposed in the enclosure between the cathode assembly and the window. The anode includes a body portion and a target surface that is positioned on the body portion so as to face away from the electron source of the cathode assembly. The anode further includes a drift tunnel that defines a path through which electrons pass from the electron source to the target surface. Finally, this example includes a voltage source electrically connected so as to provide a potential field that causes some of the electrons to impact the target surface and produce x-rays for emission through the window.

US Patent:

8077829, Dec 13, 2011

Filed:

Sep 25, 2008

Appl. No.:

12/238214

Inventors:

Paul D. Moore - Salt Lake City UT, US
Christopher F. Artig - Summit Park UT, US
Robert C. Treseder - Burton WA, US

Assignee:

Varian Medical Systems, Inc. - Palo Alto CA

International Classification:

H01J 35/06

US Classification:

378136

Abstract:

An electron emitter assembly, and methods of assembly, is disclosed. The emitter assembly includes an electron emitter that is secured to a support device in a manner such that the emitter is substantially thermally isolated from the support device.

US Patent:

20070183576, Aug 9, 2007

Filed:

Jan 31, 2006

Appl. No.:

11/343599

Inventors:

James Burke - Glenview IL, US
Charles Chidester - West Bountiful UT, US
Bruce Cain - South Jordan UT, US
Robert Treseder - Salt Lake City UT, US
James Boye - Salt Lake City UT, US
Ray Daly - Biloxi MS, US
Ricky Smith - Sandy UT, US
Paul Christean - Salt Lake City UT, US

International Classification:

H01J 35/06

US Classification:

378136000

Abstract:

A cathode assembly including certain features designed to protect the integrity of a filament contained therein is disclosed. In particular, the cathode assembly is configured to prevent damage to the filament should it inadvertently contact another portion of the cathode assembly. In an example embodiment, an x-ray tube incorporating features of the present invention is disclosed. The x-ray tube includes an evacuated enclosure containing a cathode assembly and an anode. The cathode assembly includes a head portion having a head surface. A slot is defined on the head surface and an electron-emitting filament is included in the slot. A protective surface is defined on the head surface proximate to a central portion of the filament. The protective surface in one embodiment is composed of tungsten and is configure to prevent fusing of the filament to the protective surface should the filament inadvertently contact the protective surface.

US Patent:

20120114104, May 10, 2012

Filed:

Nov 9, 2010

Appl. No.:

12/942077

Inventors:

Robert Clark Treseder - North Salt Lake UT, US
James E. Burke - Glenview IL, US

Assignee:

VARIAN MEDICAL SYSTEMS, INC. - Palo Alto CA

International Classification:

H01J 35/10

US Classification:

378125

Abstract:

An asymmetric x-ray tube. In one example embodiment, an x-ray tube includes an evacuated enclosure, a cathode assembly at least partially positioned within the evacuated enclosure and defining a first axis, and an anode assembly at least partially positioned within the evacuated enclosure and defining a second axis. The anode assembly includes a rotating anode having a focal spot. The focal spot and the second axis define a plane. The first axis is positioned beneath the plane.

US Patent:

20130182825, Jul 18, 2013

Filed:

Jan 18, 2012

Appl. No.:

13/352641

Inventors:

James Russell Boye - Salt Lake City UT, US
Robert Clark Treseder - North Salt Lake UT, US

Assignee:

VARIAN MEDICAL SYSTEMS, INC. - Palo Alto CA

International Classification:

H01J 35/06

US Classification:

378136

Abstract:

An x-ray tube cathode with magnetic electron beam steering. In one example embodiment, an x-ray tube cathode includes a cathode head and an electron emitter. The cathode head includes electrically conductive and non-magnetic material integrated with magnetic material. The cathode head defines an emitter slot in a portion of electrically conductive and non-magnetic material positioned between two portions of magnetic material. The electron emitter is positioned within the emitter slot. The electron emitter is configured to emit a beam of electrons. The beam of electrons is configured to be both focused by the electrically conductive and non-magnetic material and steered during beam formation by the magnetic material.

US Patent:

53032810, Apr 12, 1994

Filed:

Jul 9, 1992

Appl. No.:

7/910932

Inventors:

Thomas J. Koller - Salt Lake City UT
Robert C. Treseder - Salt Lake City UT

Assignee:

Varian Associates, Inc. - Palo Alto CA

International Classification:

H01J 3506

US Classification:

378134

Abstract:

A mammography X-ray tube providing increased X-ray intensity for shortening patient exposure times to eliminate motion artifacts. The cathode design permits superpositioning of electron beam from multiple filaments.

US Patent:

56895429, Nov 18, 1997

Filed:

Jun 6, 1996

Appl. No.:

8/660617

Inventors:

Gordon R. Lavering - Belmont CA
Robert C. Treseder - Salt Lake City UT

Assignee:

Varian Associates, Inc. - Palo Alto CA

International Classification:

H01J 3506

US Classification:

378142

Abstract:

The present invention provides an X-ray generating apparatus with a shield structure having an electron beam collimating aperture and heat transfer device. The shield structure is made of thermally conductive material and placed in the discharge space between an electron source and rotating anode target. The shield structure is formed by a concave top surface facing the electron source, a flat top surface facing the anode target, and inner and outer walls wherein a linear dimension of the inner wall is substantially smaller than the linear dimension of the outer wall. The inner wall surrounds the beam collecting aperture. The heat transfer device is placed in a beveled portion of the shield structure. The heat transfer device includes an extended coiled wire formed from thermally conductive material and conductively attached to the knurled interior of the shield structure to transfer heat to the cooling liquid passing through inflow and outflow chambers of the shield structure.

US Patent:

60758392, Jun 13, 2000

Filed:

Sep 2, 1997

Appl. No.:

8/921830

Inventors:

Robert C. Treseder - Salt Lake City UT

Assignee:

Varian Medical Systems, Inc. - Palo Alto CA

International Classification:

H01J 518

US Classification:

378140

Abstract:

An X-ray tube device and a method for construction thereof which provides the cathode assembly and the anode assembly in a nose of the X-ray tube, wherein an emitter face of each assembly is directed toward an X-ray emission end thereof. The electrons emitted from the cathode assembly travel along a path outward until striking the anode assembly which then generates the X-rays which are directed toward a beryllium window in the X-ray tube. This advantageous structure enables the anode-to-window distance to be small, resulting in a large X-ray flux towards a sample. Furthermore, the small nose of the X-ray tube enables a fluorescence detector to be positioned in an optimal location because the X-ray tube's shape does not displace the fluorescence detector.