Company Filing History:

12 out of 10,754

Basf Aktiengesellschaft

patents

1 out of 88

Badische Anilin- & Soda-fabrik Aktiengesellschaft

patents

Years Active: 1976-2005

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13 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6846956 - Triarylmethane dyes (2005-01-25),

2. 6160169 - Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid (2000-12-12),

3. 5892105 - Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid (1999-04-06),

4. 5073634 - Tetrachloroferrates of basic dyes (1991-12-17),

5. 4976744 - Preparation of concentrated solutions of cationic dyes as (1990-12-11),

6. 4223144 - Triphenylmethane dyes (1980-09-16),

7. 4176229 - Basic dyes (1979-11-27),

8. 4147604 - Photopolymerizable binders containing diaminobenzophenones (1979-04-03),

9. 4052398 - Diazarhodamine-lactones, their manufacture and their use as dye (1977-10-04),

10. 4000135 - Manufacture of basic dyes by catalytic oxidation (1976-12-28),

11. 3997541 - Lactones of the benzazaxanthene series and dye-forming components for (1976-12-14),

12. 3946017 - Lactones of the benzaxanthere series and dye-forming components for use (1976-03-23),

13. 3931182 - Lactones of the diazaxanthene series, their production and their use as (1976-01-06),

Title: Hellmut Kast: Innovator in Dye Chemistry

Introduction

Hellmut Kast is a notable inventor based in Bobenheim-Roxheim, Germany. He has made significant contributions to the field of dye chemistry, holding a total of 13 patents. His work has had a lasting impact on the development of various dye compounds.

Latest Patents

Among his latest patents, Kast has developed a triarylmethane dye that is characterized by a specific formula where R and R' can be independently methyl, ethyl, or hydroxyethyl. The dye is notable for not detaching carcinogenic Michler's ketone. Another significant patent involves a process for preparing amine salts of 4-nitrotoluene-2-sulfonic acid. This process includes the sulfonation of nitrotoluene with oleum, followed by dilution with water and extraction using lipophilic amines. The resulting compounds are particularly suitable for dye preparation.

Career Highlights

Throughout his career, Kast has worked with prominent companies in the chemical industry, including BASF and Badische Anilin- & Soda-fabrik Aktiengesellschaft. His expertise in dye chemistry has been instrumental in advancing the capabilities of these organizations.

Collaborations

Kast has collaborated with several notable individuals in his field, including Guenter Dunkelmann and Johannes P. Dix. These collaborations have contributed to the innovative developments in dye chemistry.

Conclusion

Hellmut Kast's contributions to dye chemistry through his patents and collaborations highlight his importance as an inventor. His work continues to influence the industry and pave the way for future innovations.

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