% Expired Patents = 16.7

Trademarks = 1

Forward Citations = 58

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8 inventors (with patents filed for the assignee):

Lorenz Sigl (2 out of 12 patents)

Günter Rau (2 out of 3 patents)

Walter Knoess (2 out of 2 patents)

4. Thomas Kalchschmid (1 out of 1 patent)

5. Heinrich Wiedemann (1 out of 1 patent)

6. Hermann Pflaum (1 out of 3 patents)

7. Herbert Vojacek (1 out of 4 patents)

8. Gunter Rau (1 out of 1 patent)

6 patents: Sort by Forward Citations

1. 6974012 - Sliding collar produced by powder metallurgy (2005-12-13),

2. 6848558 - Sintered selector or sliding sleeve (2005-02-01),

3. 5942135 - Process for welding a sintered friction-lined foil (1999-08-24),

4. 5453242 - Process for producing sintered-iron molded parts with pore-free zones (1995-09-26),

5. 5190094 - Heteroporous form tool for manufacturing casting moulds and process for (1993-03-02),

6. 5143192 - Friction clutch or friction brake (1992-09-01),

Company Overview

Sinterstahl GmbH is a leading manufacturer of high-quality metal powders and sintered components. With over 20 years of experience in the industry, we specialize in producing custom metal powders for various applications, including automotive, aerospace, and medical industries. Our state-of-the-art facilities and innovative technologies allow us to deliver superior products that meet the highest standards of quality and performance. Contact us today to learn more about our services and capabilities.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

6 Patents

#1 in Fuessen

#5,403 in Germany

Fuessen, Germany

Sinterstahl Gmbh

Forward Citations = 58

8 inventors:

Lorenz Sigl (2 out of 12 patents)

Günter Rau (2 out of 3 patents)

Walter Knoess (2 out of 2 patents)

4. Thomas Kalchschmid (1 out of 1 patent)

5. Heinrich Wiedemann (1 out of 1 patent)

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

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]