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Krefeld, Germany

Ringfeder Gmbh

USPTO Granted Patents = 12

Trademarks = 6

Forward Citations = 156

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15 inventors (with patents filed for the assignee):

Horst-Dieter Schafer (5 out of 5 patents)

Ulrich Kloren (4 out of 4 patents)

Paul Loosen (3 out of 3 patents)

4. Harry Jansen (3 out of 3 patents)

5. Hermann Haarkotter (2 out of 2 patents)

6. Hans-Martin Thiele (2 out of 2 patents)

7. Christian Stiefel (2 out of 4 patents)

8. Josef Friedrichs (2 out of 2 patents)

9. Gino Marsella (2 out of 2 patents)

10. Friedhelm Detzner (1 out of 3 patents)

11. Manfred Witzel (1 out of 1 patent)

12. Bernd Kerntopf (1 out of 1 patent)

13. Horst Kahle (1 out of 1 patent)

14. Dieter Muhlhahn (1 out of 1 patent)

15. Dieter Simons (1 out of 1 patent)

12 patents: Sort by Forward Citations

1. 4660811 - Synthetic-resin compression spring (1987-04-28),

2. 4428565 - Arrangement for resilient absorption of forces (1984-01-31),

3. 4282979 - Force absorbing arrangement (1981-08-11),

4. 4262888 - Arrangement for the absorption of forces (1981-04-21),

5. 4262887 - Friction spring unit (1981-04-21),

6. 4260142 - Arrangement for resilient absorption of forces (1981-04-07),

7. 4134699 - Coupling for shafts and the like (1979-01-16),

8. 4095908 - Coupling unit (1978-06-20),

9. 4025213 - Shaft coupled to surrounding hub (1977-05-24),

10. 4010669 - Bolt tensioning arrangement (1977-03-08),

11. 3998563 - Detachable coupling device (1976-12-21),

12. 3957381 - Coaxial, double-cone, frictional hub-to-shaft connector (1976-05-18),

Ringfeder is a leading provider of power transmission components and systems, serving various industries including automotive, aerospace, and manufacturing. They specialize in offering high-quality locking devices, couplings, and damping solutions to enhance the performance and reliability of machinery and equipment. With a strong focus on innovation and customer satisfaction, Ringfeder continues to be a trusted partner for businesses worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

12 Patents

#16 in Krefeld-Uerdingen

#3,267 in DT

#46,685 in the World

Krefeld, Germany

Ringfeder Gmbh

Forward Citations = 156

15 inventors:

Horst-Dieter Schafer (5 out of 5 patents)

Ulrich Kloren (4 out of 4 patents)

Paul Loosen (3 out of 3 patents)

4. Harry Jansen (3 out of 3 patents)

5. Hermann Haarkotter (2 out of 2 patents)

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