Srinivas Rao

US Patent:

7920039, Apr 5, 2011

Filed:

Sep 25, 2008

Appl. No.:

12/284934

Inventors:

Younes Shabany - San Jose CA, US
Juan Aguayo - San Antonio TX, US
Srinivas Rao - Saratoga CA, US

Assignee:

Flextronics AP, LLC - Broomfield CO

International Classification:

H01F 27/08
H01F 5/00
H01F 27/28

US Classification:

336 61, 336 60, 336200, 336232

Abstract:

A planar transformer comprises a laminate substrate having an opening with metal traces wound thereabout forming a primary and a secondary winding, a core configured to fit inside the opening to enclose the laminate substrate. At least one heat sink fin is integrally formed with the top, bottom or both sides of the core. A method of forming a planar transformer comprises laminating a substrate having an opening with metal traces wound thereabout forming a primary and a secondary winding, fitting a core inside the opening, and enclosing the laminate substrate. One of the top, bottom or both sides of the core include one or more heat sink fins.

US Patent:

20060231946, Oct 19, 2006

Filed:

Apr 14, 2005

Appl. No.:

11/107599

Inventors:

Lawrence Pan - Los Gatos CA, US
Gang Gu - Palo Alto CA, US
Jim Protsenko - San Jose CA, US
Xuejiao Hu - Stanford CA, US
Hongjie Dai - Cupertino CA, US
Srinivas Rao - Saratoga CA, US

International Classification:

H01L 23/34

US Classification:

257712000

Abstract:

A thermal interface includes an array of generally aligned carbon nanotubes joined to a surface with a metal layer. The array of carbon nanotubes includes a coating on the ends of the carbon nanotubes for improved wetting of the metal layer to the ends of the carbon nanotubes so that the thermal resistance at the interface between the carbon nanotubes ends and the metal is reduced. A semiconductor device that employs a thermal interface of the invention, and a method for fabricating the thermal interfaces are also provided.

US Patent:

20060255450, Nov 16, 2006

Filed:

May 11, 2006

Appl. No.:

11/433311

Inventors:

Lawrence Pan - Los Gatos CA, US
Srinivas Rao - Saratoga CA, US
Jim Protsenko - San Jose CA, US

International Classification:

H01L 23/34

US Classification:

257712000

Abstract:

Devices and methods for their manufacture are provided. The devices, such as packaged semiconductors, include thermal pads of vertically aligned carbon nanotubes to transport heat from a heat source such as a semiconductor die, to or between thermal management aids such as a heat spreader or heat sink. Some devices include spacers between the heat spreader and the heat sink to protect the thermal pad during assembly. Other devices include thermal pads that have surface layers matched by composition to the surfaces of the opposing surfaces, thus silicon on one side and a metal on the other. In some devices, the ends of the carbon nanotubes extend into the surface of the thermal management aid. Methods for bonding the thermal pads include bonding surface layers, as well as exposed carbon nanotubes, to opposing surfaces.

US Patent:

20060258054, Nov 16, 2006

Filed:

May 11, 2006

Appl. No.:

11/433184

Inventors:

Lawrence Pan - Los Gatos CA, US
Srinivas Rao - Saratoga CA, US
Jim Protsenko - San Jose CA, US
Gang Gu - Palo Alto CA, US

International Classification:

H01L 21/00

US Classification:

438122000, 174548000

Abstract:

Methods for producing carbon nanotube thermal pads comprise forming an array of carbon nanotubes on a catalyst layer on a substrate and releasing the array from the substrate. The carbon nanotubes are grown so that they are generally vertically aligned relative to the substrate. Releasing the array can include dissolving the substrate. Alternately, a release layer between the substrate and the catalyst layer can be employed. The release layer can be chemically removed, or can provide a low-strength interface that is easily pulled apart or sheared.

US Patent:

20070116626, May 24, 2007

Filed:

May 11, 2006

Appl. No.:

11/433662

Inventors:

Lawrence Pan - Los Gatos CA, US
Srinivas Rao - Saratoga CA, US
Jim Protsenko - San Jose CA, US
Gang Gu - Palo Alto CA, US

International Classification:

D01F 9/12

US Classification:

423447100

Abstract:

Methods for forming thermal pads including arrays of vertically aligned carbon nanotubes are provided. The thermal pads are formed on various substrates, including foils, thin self-supporting polished metals, semiconductor dies, heat management aids, and lead frames. The arrays are growth from a catalyst layer disposed on the substrate. Forming the array can include leaving the ends of the nanotubes unfinished, attaching a foil thereto, or coating the ends with a metal layer. The metal layer coating can then be polished to a desired smoothness. The array can be filled with a matrix material, only partially filled, or left unfilled. Where the substrate is a foil, the method can be a continuous process where foil is taken from a roll and fed through a series of formation steps. Where the substrate is a lead frame, heating can be generated by applying an current to a pad of the lead frame.

US Patent:

20070116957, May 24, 2007

Filed:

May 11, 2006

Appl. No.:

11/433185

Inventors:

Lawrence Pan - Los Gatos CA, US
Srinivas Rao - Saratoga CA, US
Jim Protsenko - San Jose CA, US
Gang Gu - Palo Alto CA, US

International Classification:

B32B 9/00

US Classification:

428408000

Abstract:

Thermal pads, including free-standing examples, are provided for dissipating heat from a heat source like a semiconductor die to a heat management aid such as a heat sink. The thermal pads include a sheet of vertically aligned carbon nanotubes and a surface layer. One such surface layer has a thickness of less than 500 microns. Another includes a metal layer having a thickness of less than 500 microns and an intermediate layer attaching the metal layer to the sheet of carbon nanotubes.

US Patent:

20110122060, May 26, 2011

Filed:

Nov 22, 2009

Appl. No.:

12/623420

Inventors:

Lothar Westerweck - San Jose CA, US
Stephen C. Arnold - Honeoye Falls NY, US
John D. Griffith - Rochester NY, US
Heidi L. Hall - Webster NY, US
Srinivas T. Rao - Saratoga CA, US

International Classification:

G09G 5/00

US Classification:

345156

Abstract:

An optical navigation device that can sense the movement of an object, such as a user's finger, so that the movement can control a feature of a consumer digital device such as a cursor on a display screen. The device includes a substrate to which an LED, reflector, and image sensor are attached. Light from the LED is directed by the elliptical reflector toward and through a window that is transparent to the light from the LED and then is reflected off of the user's finger back through the window, through a lens, and onto the image sensor. The reflector is positioned to direct light toward the window at an oblique angle, in the range of 65 to 70 degrees from an angle normal to the window. Further, the reflector is curved to gather light across a large solid angle in the vicinity of the LED. The curved shape of the reflector may be a portion of an ellipsoid and the LED may be located at one of the foci of the ellipsoid, with the window located at the other foci of the ellipsoid.

US Patent:

20210356418, Nov 18, 2021

Filed:

Jul 29, 2021

Appl. No.:

17/444014

Inventors:

- Cleveland OH, US
Steve Roth - San Jose CA, US
Srinivas Rao - Sunnyvale CA, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

G01N 27/30

Abstract:

The present invention relates generally to systems for measuring pH. In particular, the present invention relates to a continuous flow system having one or more solid state pH sensors positioned within a fluid pathway of the system to provide continuous pH measurement.