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Mulheim a.d. Ruhr, Germany

Mannesmannrohren-werke Ag

USPTO Granted Patents = 21

Trademarks = 2

Forward Citations = 286

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49 inventors (with patents filed for the assignee):

Johann Wassen (4 out of 4 patents)

Eberhard Titze (2 out of 2 patents)

Horst Biller (2 out of 2 patents)

4. Kurt Gruber (2 out of 2 patents)

5. Willi Keim (2 out of 2 patents)

6. Klaus Hentschel (2 out of 2 patents)

7. Jörn Winkels (1 out of 4 patents)

8. Steffen Keitel (1 out of 3 patents)

9. Alfred Graff (1 out of 10 patents)

10. Klaus Werner (1 out of 1 patent)

11. Wilfried Förster (1 out of 1 patent)

12. Joachim Schlegel (1 out of 3 patents)

13. Dieter Wamser (1 out of 1 patent)

14. Roland Stephan (1 out of 5 patents)

15. Jürgen Verhoeven (1 out of 1 patent)

21 patents: Sort by Forward Citations

1. 7012217 - Method and apparatus for making welded large pipes (2006-03-14),

2. 6936119 - Method for producing metallic, non-rotationally symmetrical rings with a constant wall thickness over their circumference (2005-08-30),

3. 6931931 - Device for ultrasonic weld seam testing of longitudinally welded pipes for longitudinal and transversal errors (2005-08-23),

4. 6887020 - Device for deburring the inside of a longitudinally seam-welded pipe, and method for adjusting a device of this type (2005-05-03),

5. 6866815 - Metallurgical vessel and method for producing the same (2005-03-15),

6. 4304574 - Heating system for fluidized bed gas generator (1981-12-08),

7. 4243493 - Process for transportation and distillation of petroleum with methanol (1981-01-06),

8. 4131026 - Ultrasonic testing of seams (1978-12-26),

9. 4099402 - Stretch reducing of hollow stock (1978-07-11),

10. 4089122 - Noise attenuation during steam blowing of coated tubes (1978-05-16),

11. 4038550 - Method and an apparatus for the measuring of the wall thickness of a tube (1977-07-26),

12. 4033164 - Method for rolling tubes (1977-07-05),

13. 4031738 - Plug for plug rolling (1977-06-28),

14. 4027688 - Transportation of fossil fuel materials (1977-06-07),

15. 4024946 - Transverse movement of elongated stock (1977-05-24),

Mannesmannrohren-werke Ag is a leading manufacturer of steel pipes and tubes. With over 100 years of experience in the industry, the company specializes in producing high-quality products for a wide range of applications, including oil and gas, construction, and automotive. Mannesmannrohren-werke Ag is committed to delivering innovative solutions and superior customer service to clients around the world.

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

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USPTO Data Jan 1 1976 - Dec 9 2025

21 Patents

#1 in Mulheim a.d. Ruhr

#2,155 in Germany

#29,031 in the World

Mulheim a.d. Ruhr, Germany

Mannesmannrohren-werke Ag

Forward Citations = 286

49 inventors:

Johann Wassen (4 out of 4 patents)

Eberhard Titze (2 out of 2 patents)

Horst Biller (2 out of 2 patents)

4. Kurt Gruber (2 out of 2 patents)

5. Willi Keim (2 out of 2 patents)

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