% Expired Patents = 20.0

Forward Citations = 10

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6 inventors (with patents filed for the assignee):

Hansjörg Dür (1 out of 2 patents)

Gerhard Kempf (1 out of 1 patent)

Norbert Heinzle (1 out of 1 patent)

4. Hansjoerg Dür (1 out of 1 patent)

5. Michael Prechtel (1 out of 1 patent)

6. Hansjorg Dur (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 6467250 - Method for the manufacture of elastic twisted yarns (2002-10-22),

2. 6293079 - Hollow spindle, in particular for the manufacture of elastic twisted yarns (2001-09-25),

3. 6021631 - Integrated doubling and twisting method and three-for-one twisting (2000-02-08),

4. 5979154 - Multi-twisting spindle with rotating balloon limiter (1999-11-09),

5. 5515671 - Method for building a specific yarn reserve at a rotating balloon (1996-05-14),

Company Overview

Hamel Ag is a leading agricultural machinery manufacturer specializing in high-quality and innovative products. With over 50 years of experience, we are dedicated to providing top-of-the-line equipment to farmers worldwide. Our products range from tractors and harvesters to planting and irrigation systems, all designed to improve productivity and efficiency in the field. At Hamel Ag, we are committed to delivering cutting-edge solutions to meet the evolving needs of modern agriculture.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

5 Patents

#7 in Arbon

#1,707 in Switzerland

Arbon, Switzerland

Hamel Ag

Forward Citations = 10

6 inventors:

Hansjörg Dür (1 out of 2 patents)

Gerhard Kempf (1 out of 1 patent)

Norbert Heinzle (1 out of 1 patent)

4. Hansjoerg Dür (1 out of 1 patent)

5. Michael Prechtel (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hamel Ag. Retrieved from https://idiyas.com/company/hamel-ag

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]