David Jay Lee
Land Surveyors in Salt Lake City, UT

6430264, Aug 6, 2002

Apr 29, 2000

09/561762

David S. Lee - Salt Lake City UT

Varian Medical Systems, Inc. - Palo Alto CA

H01J 3510

378144, 378143

The present invention is directed to an x-ray tube, and method of manufacture thereof, having an improved rotary anode target structure. The anode target is constructed of carbon-carbon composite material. A focal track is formed on the surface of the anode target, and is comprised of a metallic material that is capable of generating x-rays when contacted with a high velocity electron stream. The surface of the carbon-carbon composite anode is treated in a manner so as to provide an enhanced bond between the composite and the focal track material, and which diffuses any interfacial stresses that occur between the track layer and the composite substrate during thermal expansion of the two materials, which may differ significantly. In particular, the bond interface is formed by microscopically roughening the surface of the substrate, so as to provide a “saw-tooth”-like, or jagged, surface configuration. This provides a high surface contact area per unit length between the composite and the focal track material, thereby diffusing any stresses resulting from thermal expansion of the two materials.

2010004, Feb 18, 2010

Aug 14, 2008

12/192001

David S.K. Lee - Salt Lake City UT, US

VARIAN MEDICAL SYSTEMS, INC. - Palo Alto CA

H01J 35/06, H01J 9/00

378136, 445 28

One or more components of an x-ray cathode assembly are manufactured using a metal deposition process. The deposition process is carried out by providing a cathode shield and a cathode head with a cathode cup and a filament slot fabricated from a first metal, and forming a coating comprising a second metal on at least a portion of at least one of the filament slot, cathode cup, cathode head, and/or cathode shield using a deposition process so as to yield the x-ray cathode assembly. The deposition process is continued until a desired thickness of metal is achieved. Example deposition processes include electroforming, chemical vapor deposition, physical vapor deposition, plasma spray, high velocity oxygen fuel thermal spray, and detonation thermal spraying.

2009008, Apr 2, 2009

Sep 30, 2007

11/865068

David S.K. Lee - Salt Lake City UT, US
John E. Postman - Draper UT, US
Dennis Runnoe - Salt Lake City UT, US

H01J 35/10, C23C 14/14, C23C 14/22, H01J 35/08

378144, 20419217, 378143

One or more components of an x-ray target assembly are manufactured using an electroforming process. The electroforming is carried out by providing an electroforming apparatus that includes an electrolyte, a metal anode, and an electrically conductive cathode. The cathode includes an intermediate x-ray target assembly upon which the metal is to be deposited and/or an electrically conductive mold for forming a component of an x-ray target assembly. The x-ray target component (e.g., a substrate or focal track) is formed by submersing the cathode in the electrolyte and applying a voltage across the anode and the cathode to cause the metal from the anode to be electroformed on the intermediate target and/or the mold. The electroforming is continued until a desired thickness of metal is achieved. The electroforming process can be used to manufacture an x-ray target substrate, focal track, stem, barrier, or other metal layer of the target assembly.

2010004, Feb 18, 2010

Aug 14, 2008

12/191990

David S.K. Lee - Salt Lake City UT, US

VARIAN MEDICAL SYSTEMS, INC. - Palo Alto CA

H01J 35/08

378143

Stationary x-ray target assemblies manufactured using a metal deposition process to form one or more metal layers of the target. In particular, the metal deposition process is used to form an x-ray target metal layer and/or a stress buffer zone on an x-ray target substrate. The stress buffer zone improves material properties of the metals and/or the bonding between the x-ray target metal layer and the substrate. Improved bonding between the x-ray target metal layer and the substrate also improves the heat dissipation properties of the stationary x-ray target assembly.

2010026, Oct 21, 2010

Sep 6, 2007

11/851333

David S.K. Lee - Salt Lake City UT, US
John E. Postman - Draper UT, US

Varian Medical Systems, Inc. - Palo Alto CA

H01J 35/10, B23K 31/02

378127, 378144, 228121, 2281221

The x-ray target assemblies have an oxide dispersion strengthened (ODS) refractory metal alloy substrate that is bonded to a carbon-containing heat sink. The x-ray target assemblies have excellent bonding between the substrate and the heat sink. The improved bonding is achieved by placing an oxide-free barrier layer between the ODS metal substrate and the heat sink. The oxide-free barrier layer minimizes or eliminates chemical reactions that would otherwise be possible between the dispersed oxides and the carbon-based heat sink during the manufacturing process. Preventing these undesired reactions while manufacturing the x-ray target assembly yields a device with improved bonding between the heat sink and the substrate, compared to devices manufactured without the barrier layer.

2010008, Apr 1, 2010

Sep 26, 2008

12/239536

David S.K. Lee - Salt Lake City UT, US
John E. Postman - Draper UT, US

VARIAN MEDICAL SYSTEMS, INC. - Palo Alto CA

H01J 35/08, H01J 5/18, H01J 35/00

378125, 378143, 378140

In one example, an x-ray target comprises a substrate, a target core, and a target track. The substrate and target core are attached together utilizing a carbide layer and a braze layer.