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Leverkusen, Germany

Kronos International, Inc.

USPTO Granted Patents = 42

% Expired Patents = 38.1

EPO Patents = 28

Trademarks = 7

Forward Citations = 88

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58 inventors (with patents filed for the assignee):

Siegfried Bluemel (11 out of 11 patents)

Lydia Drews-Nicolai (9 out of 9 patents)

Volker Schmitt (8 out of 9 patents)

4. Frank Mersch (5 out of 7 patents)

5. Volker Juergens (5 out of 5 patents)

6. Rainer Gruber (5 out of 5 patents)

7. Volker Jürgens (5 out of 5 patents)

8. Mitja Medved (3 out of 4 patents)

9. Thomas Pierau (3 out of 4 patents)

10. Joerg Friedrich (3 out of 3 patents)

11. Heiko Frahm (3 out of 3 patents)

12. Alexander Breyder (3 out of 3 patents)

13. Siegfried Blümel (3 out of 4 patents)

14. Frank Landwehr (2 out of 3 patents)

15. Uwe Wilkenhoener (2 out of 6 patents)

Core Competencies:

Titanium Dioxide

Pigment Manufacturing

Nanoparticulate

Surface Treatment

Photocatalyst

Recycling

Composite Pigments

UV-Greying Stability

Coating Methods

Density Tailoring

Ink Production

Construction Materials

42 patents: Sort by Forward Citations

1. 12595373 - Titanium dioxide pigment with coloring after-treatment (2026-04-07),

2. 12577124 - Feedstock composite with carbonaceous material having a tailored density (2026-03-17),

3. 12503374 - Recycling of components contained in a residue obtained from the chloride process (2025-12-23),

4. 12435228 - Printing ink containing undried, coated titanium dioxide (2025-10-07),

5. 11623993 - Laminate pigment with spacing properties and high UV-greying stability (2023-04-11),

6. 11208260 - Bag for powdery bulk materials (2021-12-28),

7. 10533102 - Preparation of matt paints and printing inks (2020-01-14),

8. 10487214 - Method for coating the surface of a substrate (2019-11-26),

9. 10392526 - Matting agent and method for obtaining the same (2019-08-27),

10. 10351439 - Production of nanoparticulate titanium dioxide (2019-07-16),

11. 10160862 - Production of titanium dioxide pigment obtainable by the sulfate process with a narrow particle size distribution (2018-12-25),

12. 9962732 - Method for coating the surface of inorganic particles with silicon dioxide and at least one further inorganic compound (2018-05-08),

13. 9920182 - Method for manufacturing composite particles (2018-03-20),

14. 9909011 - Method for coating the surface of inorganic solid particles, especially titanium dioxide pigment particles (2018-03-06),

15. 9738542 - Method for the further processing of iron sulfate heptahydrate (2017-08-22),

Kronos International, Inc. is a prominent player in the specialty chemicals sector, focusing on the development and manufacturing of high-performance materials. The company specializes in providing innovative solutions for various industries, including automotive, aerospace, and consumer products. With a strong emphasis on research and technology, Kronos is dedicated to advancing sustainable practices and enhancing product performance through cutting-edge chemical formulations. Headquartered in Leverkusen, Germany, it serves a global market with a commitment to quality and innovation.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

Kronos International, Inc.

42 Patents

#10 in Leverkusen

#1,220 in Germany

#16,326 in the World

Leverkusen, Germany

Kronos International, Inc.

Forward Citations = 88

58 inventors:

Siegfried Bluemel (11 out of 11 patents)

Lydia Drews-Nicolai (9 out of 9 patents)

Volker Schmitt (8 out of 9 patents)

4. Frank Mersch (5 out of 7 patents)

5. Volker Juergens (5 out of 5 patents)

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