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Ruhrkohle Ag

USPTO Granted Patents = 69

Forward Citations = 760

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109 inventors (with patents filed for the assignee):

Eckard Wolowski (7 out of 9 patents)

Josef Langhoff (6 out of 7 patents)

Wilhelm Stewen (5 out of 7 patents)

4. Wolfgang Becker (5 out of 5 patents)

5. Jurgen Seipenbusch (4 out of 4 patents)

6. Frank Mirtsch (4 out of 4 patents)

7. Hans Oldengott (3 out of 4 patents)

8. Klaus Wessiepe (3 out of 6 patents)

9. Gerd Nashan (3 out of 12 patents)

10. Heinz Tewes (3 out of 3 patents)

11. Dieter Breidenbach (2 out of 2 patents)

12. Burckard Vitt (2 out of 2 patents)

13. Alfons Jankowski (2 out of 4 patents)

14. Klaus-Dieter Dohms (2 out of 2 patents)

15. Siegfried Ormanns (2 out of 3 patents)

Core Competencies:

Underground Energy Supply

Pneumatic Valve Control

Industrial Plant Automation

Telemetry for Boreholes

Coke Feeding Device

Hydrogenation Process

Coal Gasification

Coke Oven Technology

Fluidized Bed Reactors

Coal Liquefaction

High-Ash Coal Processing

Self-Sealing Door Assembly

69 patents: Sort by Forward Citations

1. 5810134 - Underground energy-supply train (1998-09-22),

2. 5740920 - Jigging screen device with pneumatic valve control (1998-04-21),

3. 5598149 - Commercial-size, automatic industrial plant having several parts (1997-01-28),

4. 5560437 - Telemetry method for cable-drilled boreholes and method for carrying it (1996-10-01),

5. 5421963 - Coke-feeding device with housing for a dry cooling installation for coke (1995-06-06),

6. 5279713 - Door (1994-01-18),

7. 5155966 - Roof structure (1992-10-20),

8. 5150543 - Door (1992-09-29),

9. 5107180 - System for operating a portable lamp (1992-04-21),

10. 5100536 - Method of processing substances (1992-03-31),

11. 5045179 - Process for the hydrogenation reprocessing of used oils (1991-09-03),

12. 5039379 - Dry cooling of coke (1991-08-13),

13. 5015457 - Process for the hydrogenation of organochlorine compounds, (1991-05-14),

14. 4992657 - Apparatus for detecting the cutting horizon for mining machines (1991-02-12),

15. 4986032 - Door (1991-01-22),

Ruhrkohle AG is a German coal mining company. They specialize in the extraction and production of coal for industrial and energy applications. With a history dating back over 150 years, Ruhrkohle AG has established itself as a leading player in the coal industry globally. They are committed to sustainable mining practices and strive to minimize their environmental impact. For more information about Ruhrkohle AG and their operations, please visit their official website.

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

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USPTO Data Jan 1 1976 - Dec 9 2025

69 Patents

#13 in Essen

#840 in Germany

#10,329 in the World

Ruhrkohle Ag

Forward Citations = 760

109 inventors:

Eckard Wolowski (7 out of 9 patents)

Josef Langhoff (6 out of 7 patents)

Wilhelm Stewen (5 out of 7 patents)

4. Wolfgang Becker (5 out of 5 patents)

5. Jurgen Seipenbusch (4 out of 4 patents)

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