For the Inventor, By the Inventor

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Christiana, DE, United States of America

Diesel Engine Retarders, Inc.

USPTO Granted Patents = 61

EPO Patents = 4

Trademarks = 5

Forward Citations = 1,511

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44 inventors (with patents filed for the assignee):

Joseph M Vorih (12 out of 14 patents)

Haoran Hu (10 out of 32 patents)

Mark A Israel (8 out of 10 patents)

4. Zdenek S Meistrick (6 out of 18 patents)

5. Kevin J Kinerson (6 out of 6 patents)

6. James N Usko (6 out of 8 patents)

7. Richard E Vanderpoel (6 out of 22 patents)

8. Robb Janak (4 out of 20 patents)

9. John A Schwoerer (4 out of 24 patents)

10. Neil E Fuchs (4 out of 23 patents)

11. Zhou Yang (4 out of 48 patents)

12. Vincent Pitzi (4 out of 6 patents)

13. Norman Schaefer (4 out of 5 patents)

14. John A Konopka (4 out of 4 patents)

15. Gheorghe Cosma (3 out of 6 patents)

Core Competencies:

Gas Recirculation

Engine Braking

Valve Opening Mechanism

Hydraulic Lash Adjuster

Lost Motion System

Variable Valve Actuation

Exhaust Pressure Regulation

Engine Valve Actuator

Compression Release Brake

Electro-Hydraulic Control

Exhaust Brake Control

Rocker Arm Assembly

61 patents: Sort by Forward Citations

1. 6868824 - System and method of gas recirculation in an internal combustion engine (2005-03-22),

2. 6866017 - Method and system for engine braking in an internal combustion engine using a stroke limited high pressure engine brake (2005-03-15),

3. 6732686 - Valve opening mechanism (2004-05-11),

4. 6718940 - Hydraulic lash adjuster with compression release brake (2004-04-13),

5. 6694933 - Lost motion system and method for fixed-time valve actuation (2004-02-24),

6. 6691674 - Latched reset mechanism for engine brake (2004-02-17),

7. 6647954 - Method and system of improving engine braking by variable valve actuation (2003-11-18),

8. 6594996 - Method and system for engine braking in an internal combustion engine with exhaust pressure regulation and turbocharger control (2003-07-22),

9. 6591795 - Captive volume accumulator for a lost motion system (2003-07-15),

10. 6550433 - Engine valve actuator with valve seating control (2003-04-22),

11. 6510824 - Variable lost motion valve actuator and method (2003-01-28),

12. 6474277 - Method and apparatus for valve seating velocity control (2002-11-05),

13. 6450144 - Method and apparatus for hydraulic clip and reset of engine brake systems utilizing lost motion (2002-09-17),

14. 6422186 - Lost motion rocker arm system with integrated compression brake (2002-07-23),

15. 6415752 - Captive volume accumulator for a lost motion system (2002-07-09),

Diesel Engine Retarders, Inc. is a leading provider of high-quality retarders for diesel engines. With a strong focus on innovation and performance, our retarders are meticulously designed to enhance vehicle safety, improve braking efficiency, and extend brake life. Whether it's a heavy-duty truck, a construction vehicle, or an off-road machine, our retarders offer reliable control and superior slowing capacity, ensuring smooth and safe deceleration. Visit our website for more information and to explore our range of advanced diesel engine retarders.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

61 Patents

#2 in Christiana, DE

#104 in Delaware

#5,703 in US

#11,486 in the World

Christiana, DE, United States of America

Diesel Engine Retarders, Inc.

Forward Citations = 1,511

44 inventors:

Joseph M Vorih (12 out of 14 patents)

Haoran Hu (10 out of 32 patents)

Mark A Israel (8 out of 10 patents)

4. Zdenek S Meistrick (6 out of 18 patents)

5. Kevin J Kinerson (6 out of 6 patents)

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