Roger T Simpson

This inventor holds 77 USPTO granted patents and 1 published patent application and 2 EPO patents, primarily in Variable Camshaft Timing (CPC class F01L). Top assignees: Borgwarner Inc., Borg-Warner Automotive Gmbh, Jacobs Vehicle Systems, Inc.. Active years: 1985-2019.

USPTO Granted Patents = 77 (Patent Applications = 1)

% Patents Active = 71.4

EPO Patents = 2

Average Co-Inventor Count = 1.6

ph-index = 22

Forward Citations = 1,345(Granted Patents)

Forward Citations (Not Self Cited) = 1,297(Dec 10, 2025)

Inventors with similar research interests:

Company Filing History:

Borg-Warner Automotive Gmbh

patents

1 out of 110

Jacobs Vehicle Systems, Inc.

Years Active: 1985-2019

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Areas of Expertise:

Variable Camshaft Timing

Engine Actuation

Control Systems

Electromagnetic Actuator

Differential Pressure Control

Hydraulic Tensioner

PWM Solenoid

Vane Style Phaser

Actuator Locking

Planetary Gear Set

Torsional Isolation

Positional Control

77 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 10329969 - System and method of adjusting actuation timing of valves in a piston engine (2019-06-25),

2. 10138944 - Electric phaser coupling method (2018-11-27),

3. 10006321 - Engine variable camshaft timing phaser with planetary gear set (2018-06-26),

4. 9982572 - Positional control of actuator shaft for e-phaser and method of calibration (2018-05-29),

5. 9035510 - Motor with torsional isolation means (2015-05-19),

6. 8677849 - Sprocket with damper and compensator (2014-03-25),

7. 8562476 - Manual transmission using chain and planetary gear set as final drive (2013-10-22),

8. 8256393 - Variable cam timing controls mounted in the camshaft (2012-09-04),

9. 8151746 - Control system for a variable compression engine (2012-04-10),

10. 7497297 - On demand vehicle drive system (2009-03-03),

11. 7255077 - CTA phaser with proportional oil pressure for actuation at engine condition with low cam torsionals (2007-08-14),

12. 7225770 - Electromagnetic actuator having inherently decelerating actuation between limits (2007-06-05),

13. 7214153 - Method of changing the duty cycle frequency of a PWM solenoid on a CAM phaser to increase compliance in a timing drive (2007-05-08),

14. 7137371 - Phaser with a single recirculation check valve and inlet valve (2006-11-21),

15. 6997150 - CTA phaser with proportional oil pressure for actuation at engine condition with low cam torsionals (2006-02-14),

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Conclusion: In conclusion, Roger T Simpson's passion for innovation, coupled with his technical expertise, has established him as a trailblazer in the world of technology. His relentless pursuit of excellence and commitment to pushing the boundaries of what is possible continue to inspire the next generation of inventors and innovators.