Stephen R Duffy

US Patent:

20220403704, Dec 22, 2022

Filed:

Jun 16, 2021

Appl. No.:

17/349661

Inventors:

- Houston TX, US
Stephen Duffy - Spring TX, US

International Classification:

E21B 10/43

Abstract:

Cutting elements for earth-boring tools may include a rotationally leading end positioned and configured to engage with, and remove, a material of an earth formation. A transition region may extend from proximate to a periphery of the cutting element radially inward and axially toward the rotationally leading end. The transition region may include first faceted surfaces, each first faceted surface extending at a first angle relative to a central geometric axis of the cutting element. The transition region may also include second faceted surfaces, each second faceted surface extending at a second, different angle relative to the central geometric axis of the cutting element. The first faceted surfaces and the second faceted surfaces may intersect one another at edges around a periphery of the transition region.

US Patent:

20200230693, Jul 23, 2020

Filed:

Apr 6, 2020

Appl. No.:

16/841421

Inventors:

- Houston TX, US
Richard Wayne Borge - Houston TX, US
Stephen Duffy - Spring TX, US

International Classification:

B21K 5/02
B21J 5/02
B21J 5/12
E21B 10/42

Abstract:

Methods for forming fixed-cutter earth-boring drill bits include retrieving a forged steel drill bit body from an inventory of substantially identical forged steel drill bit bodies including fixed blades and junk slots between the fixed blades. Cutter pockets are formed in the blades. Nozzle holes are formed in the drill bit body to provide fluid communication from an interior of the forged steel drill bit body to the junk slots. Additional methods include forging first and second steel drill bit bodies substantially identical in shape and configuration, forming first cutter pockets in the first steel drill bit body in a first configuration, and forming second cutter pockets in the second steel drill bit body in a second, different configuration.

US Patent:

20190376345, Dec 12, 2019

Filed:

Jun 11, 2018

Appl. No.:

16/004765

Inventors:

- Houston TX, US
Stephen Duffy - Spring TX, US

International Classification:

E21B 10/567
E21B 10/43
E21B 10/55

Abstract:

An earth-boring tool includes a body, at least one blade extending axially from the body, at least one cutting element mounted at a leading face of the at least one blade and at least one hybrid ovoid mounted at an axial end of the at least one blade and rotationally trailing the at least one cutting element. The at least one hybrid ovoid includes a cylindrical base portion, a domed upper portion extending from a top of the cylindrical base portion, and an at least substantially planar cutting surface formed in at least the domed upper portion and defining a cutting edge extending angularly through an angle of at least 180, the at least substantially planar cutting surface is configured for a shear-type cutting action, oriented substantially in the direction of intended bit rotation, and exhibits a lesser aggressiveness than the aggressiveness of the at least one cutting element.

US Patent:

20180297636, Oct 18, 2018

Filed:

Nov 15, 2017

Appl. No.:

15/813566

Inventors:

- Irvine CA, US
Stephen R. Duffy - Troy MI, US
Timothy F. McLellan - Viera FL, US
Ian Armstrong Bruce - Deer Isle ME, US

International Classification:

B62D 9/02
B60T 8/24
B62D 61/08
B60W 10/18
B62D 6/00
B60W 30/045
B62K 5/10
B62K 5/027
B60W 10/20

Abstract:

A three-wheeled tilting vehicle is disclosed. The vehicle can include an electronic control system that controls the tilting of the vehicle in higher speed turns for increased stability. The vehicle may also include a traction control system to provide additional stability during higher speed turns.

US Patent:

20180243819, Aug 30, 2018

Filed:

Feb 27, 2017

Appl. No.:

15/443413

Inventors:

- Houston TX, US
Stephen Duffy - Spring TX, US

International Classification:

B21K 5/02
E21B 10/42

Abstract:

Methods for forming fixed-cutter earth-boring drill bits include retrieving a forged steel drill bit body from an inventory of substantially identical forged steel drill bit bodies including fixed blades and junk slots between the fixed blades. Cutter pockets are formed in the blades. Nozzle holes are formed in the drill bit body to provide fluid communication from an interior of the forged steel drill bit body to the junk slots. Additional methods include forging first and second steel drill bit bodies substantially identical in shape and configuration, forming first cutter pockets in the first steel drill bit body in a first configuration, and forming second cutter pockets in the second steel drill bit body in a second, different configuration.

US Patent:

20170217487, Aug 3, 2017

Filed:

Oct 7, 2016

Appl. No.:

15/288937

Inventors:

- Newport Beach CA, US
Stephen R. Duffy - Troy MI, US
Timothy F. McLellan - Viera FL, US
Ian Armstrong Bruce - Deer Isle ME, US

International Classification:

B62D 9/02
B60W 10/18
B60T 8/24
B62D 6/00
B62D 61/08
B60W 10/20
B60W 30/045

Abstract:

A three-wheeled tilting vehicle is disclosed. The vehicle can include an electronic control system that controls the tilting of the vehicle in higher speed turns for increased stability. The vehicle may also include a traction control system to provide additional stability during higher speed turns.

US Patent:

20150274160, Oct 1, 2015

Filed:

Jan 29, 2015

Appl. No.:

14/609314

Inventors:

- Newport Beach CA, US
Stephen R. Duffy - Troy MI, US
Timothy F. McLellan - Viera FL, US
Ian Bruce - Laguna Nigel CA, US

International Classification:

B60W 30/045
B62K 5/10
B60W 10/18
B62D 61/08
B60W 10/20
B62K 5/027
B62D 9/02

Abstract:

A three-wheeled tilting vehicle is disclosed. The vehicle can include an electronic control system that controls the tilting of the vehicle in higher speed turns for increased stability. The vehicle may also include a traction control system to provide additional stability during higher speed turns.

Address:

4119 Via Marina, Marina del Rey, CA 90292

Phone:

2483153178

VIN:

JTHBF5C21B5142413

Make:

LEXUS

Model:

IS 250

Year:

2011