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Seelze, Germany

Riedel-de Haen Aktiengesellschaft

USPTO Granted Patents = 39

Trademarks = 9

Forward Citations = 309

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45 inventors (with patents filed for the assignee):

Eugen Scholz (8 out of 9 patents)

Wolfgang Lindner (3 out of 13 patents)

Horst Schmand (3 out of 4 patents)

4. Gunter Bartels (3 out of 4 patents)

5. Reinhard Knieps (3 out of 3 patents)

6. Wolfgang Dannenberg (3 out of 3 patents)

7. Bernd Schonfeld (3 out of 3 patents)

8. Ralph Lonsky (2 out of 3 patents)

9. Lutz Uwe Lehmann (2 out of 3 patents)

10. Erich Taschenbrecker (2 out of 3 patents)

11. Andreas Winterfeldt (2 out of 4 patents)

12. Wolfgang Hirsch (2 out of 2 patents)

13. Karl Heinrich Lieser (2 out of 3 patents)

14. Peter Burba (2 out of 2 patents)

15. Karl Franz (2 out of 2 patents)

39 patents: Sort by Forward Citations

1. 6261753 - Use of indolenine-cyaninedisulphonic acid derivatives (2001-07-17),

2. 5747233 - Use of indoleine-cyaninedisulphonic acid derivatives (1998-05-05),

3. 5744638 - Process for the preparation of haloanthranilic acids (1998-04-28),

4. 5597701 - Process for determining androstenone contents in adipose tissues (1997-01-28),

5. 5567618 - Karl Fischer reagent (1996-10-22),

6. 5480898 - Storage-stable aqueous solutions of isothiazolin-3-ones (1996-01-02),

7. 5466606 - Use of N-methylformamide as solvent for the Karl Fischer titration (1995-11-14),

8. 5430202 - Process for the preparation of substantially fluorinated alkyl bromides (1995-07-04),

9. 5401662 - Method and reagent for the determination of water (1995-03-28),

10. 5354869 - 3,6-bis-(2'-methoxyphenyl)-2,5-dihydro-2,5-dimethyl-pyrrolo (1994-10-11),

11. 5336818 - Process for the preparation of substantially fluorinated alkyl bromides (1994-08-09),

12. 5292413 - Catholyte for the Karl Fischer coulometric water determination (1994-03-08),

13. 5160666 - Liquid preservatives (1992-11-03),

14. 5139955 - Reagent, cell and method for the coulometric determination of water (1992-08-18),

15. 5125953 - Use of a microbicidal agent for the treatment of concrete roof tiles (1992-06-30),

Riedel-de Haen Aktiengesellschaft, now a part of Sigma-Aldrich, is a leading supplier of analytical chromatography products. With a vast range of high-quality chemicals and reagents, Riedel-de Haen serves various industries, including pharmaceutical, environmental, and biotechnology. Their commitment to excellence and innovation drive the development of cutting-edge solutions for accurate and reliable analysis. For more information, visit their website.

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USPTO Data Jan 1 1976 - Dec 2 2025

39 Patents

#1 in Seelze

#1,322 in Germany

#16,914 in the World

Seelze, Germany

Riedel-de Haen Aktiengesellschaft

Forward Citations = 309

45 inventors:

Eugen Scholz (8 out of 9 patents)

Wolfgang Lindner (3 out of 13 patents)

Horst Schmand (3 out of 4 patents)

4. Gunter Bartels (3 out of 4 patents)

5. Reinhard Knieps (3 out of 3 patents)

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