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Regensdorf, Switzerland

Gretag Aktiengesellschaft

USPTO Granted Patents = 85

Forward Citations = 1,444

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65 inventors (with patents filed for the assignee):

Hans Ott (14 out of 24 patents)

Kurt Ehrat (9 out of 14 patents)

Fred Mast (8 out of 10 patents)

4. Ernst Huber (6 out of 6 patents)

5. Rene Luscher (6 out of 6 patents)

6. Markus Berner (5 out of 10 patents)

7. Rino Ernst Kunz (4 out of 13 patents)

8. Thomas Senn (3 out of 8 patents)

9. Fortunat Schrammli (3 out of 3 patents)

10. Jean A Knus (3 out of 3 patents)

11. Walter Grossmann (3 out of 3 patents)

12. Pierre Schmid (3 out of 3 patents)

13. Walter R Widmer (3 out of 3 patents)

14. Robert Wahli (3 out of 3 patents)

15. Bruno Zimmermann (2 out of 4 patents)

Core Competencies:

Halftone Percentage

Photometric Data

Ink Control

Print Quality

Optical Reflection

Densitometer

Laser Processing

Colorimetric Analysis

Image Defects

Speech Processing

Data Encryption

Illuminating Device

85 patents: Sort by Forward Citations

1. 6084693 - Process and apparatus for the determination of halftone percentage values (2000-07-04),

2. 5987396 - Computer-controlled device for detecting optical transmission and/or (1999-11-16),

3. 5530563 - Process and apparatus for the determination of halftone percentage values (1996-06-25),

4. 5519210 - Apparatus and a process for recording photometric data that is (1996-05-21),

5. 5426508 - Manual densitometer with manully operated dial (1995-06-20),

6. D357695 - Hand held unit for determining photometric data (1995-04-25),

7. 5267178 - Photometric process and computer controlled photometer (1993-11-30),

8. 5206707 - Apparatus for the analysis of print control fields (1993-04-27),

9. 5113258 - Compensation circuit for the correction of image defects of a television (1992-05-12),

10. 5068810 - Process for the determination of colorimetric differences between two (1991-11-26),

11. 5020106 - Process for the cryptographic processing of data and cryptographic (1991-05-28),

12. 5015088 - Illuminating apparatus for projection purposes (1991-05-14),

13. 4975862 - Process and apparatus for the ink control of a printing machine (1990-12-04),

14. 4969188 - Process and apparatus for the protection of secret elements in a network (1990-11-06),

15. 4968140 - Manual device for the determination or measurement of photometric data (1990-11-06),

Gretag Aktiengesellschaft, based in Regensdorf, Switzerland, specializes in photometric technology, focusing on enhancing print quality through advanced optical and colorimetric analysis. The company develops solutions that optimize halftone percentages and ink control, ensuring precise color reproduction and consistency in printing processes. With expertise in densitometry and laser processing, Gretag is committed to advancing the field of photometry, providing innovative tools for industries reliant on high-quality visual outputs.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

Gretag Aktiengesellschaft

85 Patents

#1 in Regensdorf

#188 in Switzerland

#8,944 in the World

Regensdorf, Switzerland

Gretag Aktiengesellschaft

Forward Citations = 1,444

65 inventors:

Hans Ott (14 out of 24 patents)

Kurt Ehrat (9 out of 14 patents)

Fred Mast (8 out of 10 patents)

4. Ernst Huber (6 out of 6 patents)

5. Rene Luscher (6 out of 6 patents)

Please report any incorrect information to [email protected]

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