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Cologne, Germany

Leybold Durferrit Gmbh

USPTO Granted Patents = 22

Forward Citations = 94

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44 inventors (with patents filed for the assignee):

Franz Hugo (7 out of 26 patents)

Erwin Wanetzky (3 out of 14 patents)

Alok Choudhury (3 out of 14 patents)

4. Alfred Henn (3 out of 5 patents)

5. Ulrich Betz (2 out of 6 patents)

6. Harald Scholz (2 out of 14 patents)

7. Peter Minarski (2 out of 4 patents)

8. Wilfried Goy (2 out of 8 patents)

9. Albrecht Melber (2 out of 10 patents)

10. Matthias Blum (2 out of 13 patents)

11. Felix Muller (2 out of 6 patents)

12. Friedrich Preisser (2 out of 9 patents)

13. Otto W Stenzel (2 out of 21 patents)

14. Michael Protzmann (1 out of 4 patents)

15. Michael Schaefer (1 out of 2 patents)

22 patents: Sort by Forward Citations

1. 6085827 - Method for the directed solidification of molten metal and a casting (2000-07-11),

2. 5544194 - Apparatus for degreasing electrically conductive material (1996-08-06),

3. 5532446 - Magnetic deflection system for a high-power electron beam (1996-07-02),

4. 5505008 - Method for recycling materials containing plastic, rubber or lacquer (1996-04-09),

5. 5503215 - Precision casting system with lock (1996-04-02),

6. 5480127 - Apparatus for the melting and treatment of metal (1996-01-02),

7. 5479438 - Apparatus for fusing a solid layer of electrically conductive material (1995-12-26),

8. 5478057 - Apparatus for the heat treatment of workpieces (1995-12-26),

9. 5445789 - Method and apparatus for degreasing and compacting electrically (1995-08-29),

10. 5425047 - Closed induction furnace with a tilting apparatus (1995-06-13),

11. 5416793 - Induction melting apparatus sealed against the atmosphere (1995-05-16),

12. 5383980 - Process for hardening workpieces in a pulsed plasma discharge (1995-01-24),

13. 5372655 - Method for the treatment of alloy steels and refractory metals (1994-12-13),

14. 5343492 - Closed induction furnace for the melting and casting of substances (1994-08-30),

15. 5294096 - Power supply coil for the ceramic-free outlet of a melting pot (1994-03-15),

Company Overview

Leybold Durferrit GmbH, based in Cologne, Germany, specializes in vacuum technology and solutions. The company is recognized for its innovative developments in vacuum pumps, systems, and components, serving a diverse range of industries including semiconductor manufacturing, coating technology, and research applications. With a strong emphasis on quality and performance, Leybold Durferrit is committed to advancing vacuum technology to meet the evolving needs of its global clientele, ensuring efficiency and reliability in various applications.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

22 Patents

#31 in Cologne

#2,061 in Germany

#28,749 in the World

Cologne, Germany

Leybold Durferrit Gmbh

Forward Citations = 94

44 inventors:

Franz Hugo (7 out of 26 patents)

Erwin Wanetzky (3 out of 14 patents)

Alok Choudhury (3 out of 14 patents)

4. Alfred Henn (3 out of 5 patents)

5. Ulrich Betz (2 out of 6 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Leybold Durferrit Gmbh. Retrieved from https://idiyas.com/company/leybold-durferrit

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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