For the Inventor, By the Inventor

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Wilmington, DE, United States of America

Diesel Engine Retarders, Inc.

USPTO Granted Patents = 63

% Expired Patents = 4.8

EPO Patents = 4

Trademarks = 5

Forward Citations = 1,546

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43 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 (7 out of 18 patents)

5. James N Usko (7 out of 8 patents)

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

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

8. Vincent Pitzi (5 out of 6 patents)

9. Robb Janak (4 out of 21 patents)

10. John A Schwoerer (4 out of 25 patents)

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

12. Zhou Yang (4 out of 48 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 Actuation

Compression Release

Hydraulic Adjuster

Lost Motion System

Turbocharger Control

Exhaust Regulation

Rocker Brake

Piston Assembly

Variable Control

Electro-Hydraulic

63 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),

Company Overview

Diesel Engine Retarders, Inc., based in Wilmington, DE, specializes in advanced technologies for diesel engine retardation systems. The company focuses on enhancing engine braking performance through innovative solutions such as gas recirculation, valve actuation, and compression release mechanisms. Their expertise extends to hydraulic adjusters, lost motion systems, turbocharger control, and exhaust regulation, positioning them as a key player in the automotive engineering sector, particularly in improving the efficiency and safety of diesel engines.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

63 Patents

#87 in Wilmington, DE

#106 in Delaware

#5,760 in US

#11,627 in the World

Wilmington, DE, United States of America

Diesel Engine Retarders, Inc.

Forward Citations = 1,546

43 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 (7 out of 18 patents)

5. James N Usko (7 out of 8 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Diesel Engine Retarders, Inc.. Retrieved from https://idiyas.com/company/diesel-engine-retarders

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

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