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For the Inventor, By the Inventor

Muenster, Germany

Kreyenborg Gmbh


USPTO Granted Patents = 3

% Expired Patents = 33.3

Trademarks = 1

Forward Citations = 6

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3 inventors (with patents filed for the assignee):

goldMedal Frank Hartmann (2 out of 4 patents)

silverMedal Jan-Udo Kreyenborg (1 out of 3 patents)

bronzeMedal Michael Andress (1 out of 1 patent)


3 patents:

1. 8640881 - Screen changer (2014-02-04),
2. 8622221 - Device for filtering polymer melts (2014-01-07),
3. 5607583 - Filter device for extruders and injection-molding machines (1997-03-04),
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USPTO Data Jan 1 1976 - Oct 13 2026

3 Patents

#21 in Muenster

#8,427 in Germany

Muenster, DE
Muenster, Germany

Kreyenborg Gmbh

Forward Citations = 6

3 inventors:

goldMedal Frank Hartmann (2 out of 4 patents)

silverMedal Jan-Udo Kreyenborg (1 out of 3 patents)

bronzeMedal Michael Andress (1 out of 1 patent)

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

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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