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For the Inventor, By the Inventor

Freiburg, Germany

Efd Induction Gmbh


USPTO Granted Patents = 3

% Expired Patents = 66.7


Forward Citations = 2

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7 inventors (with patents filed for the assignee):

goldMedal Joerg Rollmann (1 out of 8 patents)

silverMedal Bernd Stakemeier (1 out of 6 patents)

bronzeMedal Reinhard Zernickel (1 out of 1 patent)

4.  Josef Wagner (1 out of 1 patent)

5.  Leif Markegaard (1 out of 1 patent)

6.  Wilfried Spintig (1 out of 2 patents)

7.  Kristian Berggren (1 out of 1 patent)

8.  Jörg Rollmann (8 patents)

9.  Wiilfried Spintig (0 patent)

10.  David Eckert (0 patent)

11.  Hansjuerg Stiele (0 patent)

12.  David Eckert (0 patent)

13.  Daniel Kaltenbach (0 patent)

14.  Kristian Berggren (0 patent)


3 patents:

1. 8766150 - Device for hardening the teeth of gear wheels by individual inductive heat treatment for each tooth, using several inductors (2014-07-01),
2. 8338760 - Inductor for induction hardening of metal, rod-shaped toothed racks (2012-12-25),
3. 8091239 - Method for the production of a bearing ring for large-size rolling bearings (2012-01-10),
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USPTO Data Jan 1 1976 - Sep 22 2026

3 Patents

#42 in Freiburg

#8,420 in Germany

Freiburg, DE
Freiburg, Germany

Efd Induction Gmbh

Forward Citations = 2

7 inventors:

goldMedal Joerg Rollmann (1 out of 8 patents)

silverMedal Bernd Stakemeier (1 out of 6 patents)

bronzeMedal Reinhard Zernickel (1 out of 1 patent)

4.  Josef Wagner (1 out of 1 patent)

5.  Leif Markegaard (1 out of 1 patent)

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