Company Filing History:

20 out of 2,080

Henkel Kommanditgesellschaft Auf Aktien

Years Active: 1982-1990

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21 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 4976742 - META-aminophenols useful as oxidation hair dye couplers (1990-12-11),

2. 4900327 - Preparations containing substantive nitrodiphenylamine derivative hair (1990-02-13),

3. 4900325 - Hair-dyeing preparations (1990-02-13),

4. 4859206 - Hair dye preparations containing nitrodiphenylamine derivative (1989-08-22),

5. 4842612 - Aminophenyl alkylenediamines useful in oxidation hair dyes (1989-06-27),

6. 4838893 - Oxidation hair dyes comprising substituted dihydroxypyridines as (1989-06-13),

7. 4832697 - Hair dye preparations containing substantive nitrodiphenylamine (1989-05-23),

8. 4784667 - Oxidation hair dyes comprising diamino-substituted pyridines and (1988-11-15),

9. 4756716 - Preparations containing substantive nitrodiphenylamine derivative hair (1988-07-12),

10. 4756715 - Hair-dyeing preparations containing substantive nitrodiphenylamine (1988-07-12),

11. 4745652 - New tetra-aminopyrimidine derivatives and their use in hair-dyeing (1988-05-24),

12. 4698066 - Amine oxidation dye hair treating compositions (1987-10-06),

13. 4685931 - Acrylate dispersion and its use for thickening hydrogen peroxide (1987-08-11),

14. 4684371 - Oxidation hair dyes comprising m-phenylenediamine derivatives as (1987-08-04),

15. 4619666 - Hair dyes containing amino-nitrobenzoic acid or amino-nitrobenzene (1986-10-28),

Title: Norbert Maak: Innovator in Hair Dye Chemistry

Introduction

Norbert Maak, a prominent inventor based in Neuss, Germany, has made significant contributions to the field of hair dye chemistry. With a remarkable portfolio of 21 patents, Maak has focused on innovations that enhance the effectiveness and safety of hair dyeing preparations.

Latest Patents

Among his latest inventions, Maak has developed meta-aminophenols useful as oxidation hair dye couplers. These meta-aminophenols follow a specific formula where R can be hydrogen, C1-4 alkyl, or C2-4 hydroxyalkyl. His inventions explore their use as couplers in oxidative hair dyes in combination with developers. Another important patent involves hair-dyeing compositions containing oxidation dye precursors and a carrier, which incorporate coupler components that can form various cyclic structures. These compositions also contain typical developer components and are particularly suitable as red couplers for developers of the 2,4,5,6-tetraaminopyrimidine type, including derivatives.

Career Highlights

Norbert Maak has held key positions in notable companies such as Henkel Kommanditgesellschaft Auf Aktien and Henkel KGaA. His work in these organizations has allowed him to drive innovations that have had a lasting impact on the hair care industry.

Collaborations

Throughout his career, Maak has collaborated with talented individuals such as David Rose and Edgar Lieske. These collaborations have fostered a creative environment that has led to the development of groundbreaking hair dye technologies.

Conclusion

Norbert Maak's contributions to the field of hair dye chemistry exemplify the spirit of innovation that drives advancement in cosmetic science. With his extensive patent portfolio and impactful collaborations, Maak continues to shape the future of hair care products.

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