Quan T Nguyen

US Patent:

6367568, Apr 9, 2002

Filed:

May 15, 2001

Appl. No.:

09/858138

Inventors:

Stephen C. Steinke - The Woodlands TX
Gary R. Portwood - Kingwood TX
Gary E. Garcia - The Woodlands TX
David P. Moran - The Woodlands TX
Quan V. Nguyen - Santa Ana CA

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 1008

US Classification:

175331, 175336, 175341, 1754201, 175430, 175432

Abstract:

A cutter element for a drill bit. The cutter element has a base portion and an extending portion and the extending portion has either a zero draft or a negative draft with respect to the base portion. The non-positive draft allows more of the borehole bottom to be scraped using fewer cutter elements. The cutter elements having non-positive draft can be either tungsten carbide inserts or steel teeth.

US Patent:

7331410, Feb 19, 2008

Filed:

Aug 20, 2004

Appl. No.:

10/923653

Inventors:

Zhou Yong - Spring TX, US
Jim Minikus - Spring TX, US
Quan Nguyen - Santa Ana CA, US
Sharath Kolachalam - Houston TX, US

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 10/08

US Classification:

175331, 175373, 175426, 761084

Abstract:

Disclosed are a variety of arcuate-shaped inserts for drill bits, and in particular, for placement in rolling cone cutters of drill bits. The arcuate inserts include 360 or ring-shaped inserts, as well as inserts of smaller arcuate length. The arcuate inserts are suitable for use in all surfaces of the rolling cone cutter, and in other locations in drill bits, and may have specialized cutting surfaces and material enhancements to enhance their cutting duty performance. Certain arcuate inserts may include stress relieving discontinuities such that, upon assembly into the cone or during drilling, the arcuate inserts may fragment in a controlled and predicted manner into shorter arcuate lengths.

US Patent:

59745240, Oct 26, 1999

Filed:

Oct 28, 1997

Appl. No.:

8/959647

Inventors:

Hoichi Cheong - Austin TX
Paul Joseph Jordan - Austin TX
Quan Nguyen - Austin TX
Hung Qui Le - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 946

US Classification:

712 23

Abstract:

According to one aspect of the invention, a method is provided for maintaining the state of a processor having a plurality of physical registers and a rename register map which stores rename pairs that associate architected and physical registers, the rename register map having a plurality of entries which are associated with the physical registers, individual entries having an architected register field, an architected status bit and a history status bit. In one version, the method includes the steps of dispatching an instruction which targets an architected register; determining a presently architected entry in the rename register map in which an architected pointer in the architected register field of the entry matches the architected register pointer of the architected register targeted by the dispatched instruction and the architected status bit is set; resetting the architected status bit; setting the history status bit in the entry and saving the physical register pointer to a checkpoint recovery table if the dispatched instruction is interruptible or if the architected register of the dispatched instruction has not been targeted since the latest dispatched interruptible instruction; determining a next available rename register map entry; writing a pointer to the architected register targeted by the instruction into the architected register field and setting the architected status bit in the next available rename register map entry.

US Patent:

59007400, May 4, 1999

Filed:

Dec 15, 1995

Appl. No.:

8/574466

Inventors:

Quan Nguyen - Austin TX
Ivan Vo - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03K 19003

US Classification:

326 21

Abstract:

First current is conducted through a first path to adjust a voltage at a node toward a predetermined level in response to the voltage being within a first subrange of voltages. Second current is conducted through a second path to adjust the voltage at the node toward the predetermined level in response to the voltage being within a second subrange of voltages.

US Patent:

6002285, Dec 14, 1999

Filed:

May 28, 1996

Appl. No.:

8/654361

Inventors:

John Stephen Muhich - Austin TX
Quan Nguyen - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03K 3356

US Classification:

327208

Abstract:

An output signal is output to a selected one of first and second output nodes in response to an event in which a control node transitions from a first logic state to a second logic state. The selected one of the first and second output nodes is selected in response to a logic state of an input node during the event. A minimum setup time for the logic state of the input node to be stable before the control node transitions to the second logic state is shorter than a minimum time for inverting the logic state of the input node.