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For the Inventor, By the Inventor

Krefeld, Germany

Ringfeder Gmbh


USPTO Granted Patents = 12

Trademarks = 6

Forward Citations = 158

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15 inventors (with patents filed for the assignee):

goldMedal Horst-Dieter Schafer (5 out of 5 patents)

silverMedal Ulrich Kloren (4 out of 4 patents)

bronzeMedal 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:

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),
Company Overview
Ringfeder GmbH, based in Krefeld, Germany, specializes in the development and manufacturing of high-quality mechanical components and systems. The company is renowned for its expertise in power transmission, offering innovative solutions such as locking devices, couplings, and damping systems. With a strong focus on engineering excellence, Ringfeder serves various industries, including automotive, machinery, and renewable energy, providing reliable products that enhance performance and safety in demanding applications.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

12 Patents

#15 in Krefeld-Uerdingen

#3,299 in DT

#48,163 in the World

Krefeld, DE
Krefeld, Germany

Ringfeder Gmbh

Forward Citations = 158

15 inventors:

goldMedal Horst-Dieter Schafer (5 out of 5 patents)

silverMedal Ulrich Kloren (4 out of 4 patents)

bronzeMedal Paul Loosen (3 out of 3 patents)

4.  Harry Jansen (3 out of 3 patents)

5.  Hermann Haarkotter (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Ringfeder Gmbh. Retrieved from https://idiyas.com/company/ringfeder

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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