For the Inventor, By the Inventor

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Heidelberg, Germany

Grau Gmbh

USPTO Granted Patents = 22

Trademarks = 4

Forward Citations = 181

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17 inventors (with patents filed for the assignee):

Roland Blanz (5 out of 10 patents)

William S Broome (5 out of 8 patents)

Dieter Stockel (4 out of 9 patents)

4. Colin F Ross (2 out of 4 patents)

5. Hans-Jurgen Oberg (2 out of 2 patents)

6. Friedrich E Schneider (1 out of 9 patents)

7. Jercy Sulzyc (1 out of 1 patent)

8. Raymond S Porter (1 out of 1 patent)

9. Robert D Prescott (1 out of 2 patents)

10. Jerzy Sulzyc (1 out of 1 patent)

11. Horst Venghaus (1 out of 1 patent)

12. George Sulzyc (1 out of 1 patent)

13. Georg Sulzyc (1 out of 1 patent)

14. Heinz Spengler (1 out of 2 patents)

15. Hermann Heiss (1 out of 1 patent)

22 patents: Sort by Forward Citations

1. 6041808 - Compressed air control device for a source of compressed air on motor (2000-03-28),

2. 5871217 - Levelling valve for automatically keeping constant the vehicle height of (1999-02-16),

3. 5730428 - Leveling valve having a precision adjustment device (1998-03-24),

4. 5678900 - Unloader for a source of air under pressure on vehicles (1997-10-21),

5. 5615929 - Brake system for a vehicle train (1997-04-01),

6. 5551734 - Connection assembly for the connection of a pipe to a plastic housing (1996-09-03),

7. 5549362 - Braking systems (1996-08-27),

8. 5477089 - Automotive electronic control systems (1995-12-19),

9. 5443306 - Electrohydraulic brake control system (1995-08-22),

10. 5421644 - Vehicle braking system (1995-06-06),

11. 5395164 - Operating brake valve for an electrically and pneumatically actuated (1995-03-07),

12. 5372413 - Multi-channel vehicle braking system with multiple supply valves and (1994-12-13),

13. 5277485 - Vehicle braking system (1994-01-11),

14. 5203375 - Leveling valve (1993-04-20),

15. 5176404 - Level control valve for automatically keeping constant the vehicle (1993-01-05),

Grau GmbH is a leading manufacturer of industrial machinery and equipment. With over 50 years of experience in the industry, we specialize in producing high-quality products for various sectors including automotive, aerospace, and electronics. Our state-of-the-art facilities and skilled workforce ensure that we provide innovative solutions to meet our customers' needs. Visit our website to learn more about our company and the services we offer.

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

Company Badge

USPTO Data Jan 1 1976 - Sep 22 2026

22 Patents

#18 in Heidelberg

#2,056 in Germany

#28,704 in the World

Heidelberg, Germany

Grau Gmbh

Forward Citations = 181

17 inventors:

Roland Blanz (5 out of 10 patents)

William S Broome (5 out of 8 patents)

Dieter Stockel (4 out of 9 patents)

4. Colin F Ross (2 out of 4 patents)

5. Hans-Jurgen Oberg (2 out of 2 patents)

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