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Marktheidenfeld, Germany

Hydraulik-Ring Gmbh

USPTO Granted Patents = 90

% Expired Patents = 43.3

EPO Patents = 9

Trademarks = 2

Forward Citations = 634

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81 inventors (with patents filed for the assignee):

Alfred Trzmiel (23 out of 37 patents)

Andreas Knecht (17 out of 38 patents)

Roland Meyer (12 out of 20 patents)

4. Edwin Palesch (11 out of 17 patents)

5. Dieter Maisch (9 out of 13 patents)

6. Friedrich Johann Zapf (9 out of 21 patents)

7. Bernd Niethammer (9 out of 26 patents)

8. Gerold Sluka (8 out of 14 patents)

9. Andreas Wild (7 out of 9 patents)

10. Rolf Neuhaus (7 out of 8 patents)

11. Dieter Tischer (7 out of 18 patents)

12. Marius Cornea (6 out of 8 patents)

13. Gordon Neudoerfer (5 out of 6 patents)

14. Martin Lenk (5 out of 8 patents)

15. Steffen Martin (5 out of 5 patents)

Core Competencies:

Camshaft Adjuster

Hydraulic Circuit

Variable Valve Lift

Metering Valve

Pressure Control Valve

Solenoid Valve

Actuating Device

Fuel Injection Device

Throttle Valve

Directional Seat Valve

Radial Piston Pump

Damping Device

90 patents: Sort by Forward Citations

1. 8230832 - Vane-type camshaft adjuster (2012-07-31),

2. 8074673 - Freeze-resistant metering valve (2011-12-13),

3. 7946266 - Hydraulic circuit, particularly for camshaft adjusters, and corresponding control element (2011-05-24),

4. 7895981 - Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine (2011-03-01),

5. 7836857 - Hydraulic circuit, particularly for camshaft adjusters, and corresponding control element (2010-11-23),

6. 7640902 - Rotor for vane-type motor with reduced leakage (2010-01-05),

7. 7624711 - Variable mechanical valve control for an internal combustion engine (2009-12-01),

8. 7603973 - Variable mechanical valve control for an internal combustion engine (2009-10-20),

9. 7600531 - Valve with check valve (2009-10-13),

10. 7594516 - Freeze-resistant metering valve (2009-09-29),

11. 7513230 - Camshaft adjusting device (2009-04-07),

12. 7497232 - Pressure control valve (2009-03-03),

13. 7497193 - Rotor of a camshaft adjuster (2009-03-03),

14. 7418935 - Stroke adjusting device for valves of a combustion engine (2008-09-02),

15. 7331318 - Camshaft adjuster with play-free locking (2008-02-19),

Hydraulik-Ring GmbH is a leading company in the hydraulic industry. With over 50 years of experience, we specialize in the design, manufacturing, and distribution of high-quality hydraulic components and systems. Our extensive product range includes hydraulic cylinders, pumps, valves, hoses, and fittings. We are committed to delivering reliable solutions that meet our customers' specific hydraulic needs. Visit our website for more information about our products and services.

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

Company Badge

USPTO Data Jan 1 1976 - Sep 15 2026

90 Patents

#1 in Marktheidenfeld

#650 in Germany

#8,505 in the World

Marktheidenfeld, Germany

Hydraulik-Ring Gmbh

Forward Citations = 634

81 inventors:

Alfred Trzmiel (23 out of 37 patents)

Andreas Knecht (17 out of 38 patents)

Roland Meyer (12 out of 20 patents)

4. Edwin Palesch (11 out of 17 patents)

5. Dieter Maisch (9 out of 13 patents)

Please report any incorrect information to [email protected]

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