Paul Stahlhofen

This inventor holds 34 USPTO granted patents, primarily in Photosensitive Materials. Top assignees: Hoechst Aktiengesellschaft, Hoechst Celanese Corporation. Active years: 1976-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Paul Stahlhofen. Retrieved from https://idiyas.com/inventor/paul-stahlhofen

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 34

% Patents Active = 100.0

Average Co-Inventor Count = 1.3

ph-index = 14

Forward Citations = 558(Granted Patents)

Company Filing History:

32 out of 6,705

Hoechst Aktiengesellschaft

patents

2 out of 1,194

Hoechst Celanese Corporation

patents

Years Active: 1976-1993

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Areas of Expertise:

Photosensitive Mixture

Light-Sensitive Composition

Photographic Elements

Negative Relief Copies

Offset Printing Plates

Gumming Solution

Positive Copying Material

1,2-Naphthoquinone

O-Quinone Diazide

Copying Materials

Alkali Soluble

Light-Sensitive Compound

34 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5225310 - Photosensitive mixture containing an ester or amide of (1993-07-06),

2. 5149613 - Process for producing images on a photosensitive material (1992-09-22),

3. 5143815 - Light-sensitive mixture based on 1,2-naphthoquinone-diazides, and (1992-09-01),

4. 5084372 - Process for preparing photographic elements utilizing light-sensitive (1992-01-28),

5. 5070001 - Light-sensitive mixture for producing positive or negative relief copies (1991-12-03),

6. 5017462 - Process of producing negative relief copies utilizing photosensitive (1991-05-21),

7. 5008175 - Copying materials (1991-04-16),

8. 4990429 - Process for the production of negative relief copies utilizing reversal (1991-02-05),

9. 4983478 - Burn-in gumming composition for offset printing plates (1991-01-08),

10. 4889789 - Photosensitive composition and photosensitive copying material prepared (1989-12-26),

11. 4889788 - Photosensitive composition, photosensitive copying material prepared (1989-12-26),

12. 4885230 - Burn-in gumming composition for offset printing plates (1989-12-05),

13. 4786581 - Gumming solution for use in the burning-in of offset-printing plates (1988-11-22),

14. 4717640 - Light-sensitive mixture, recording material prepared therefrom and (1988-01-05),

15. 4642282 - Light-sensitive positive copying material with alkali soluble (1987-02-10),

Title: Innovations by Paul Stahlhofen: A Pioneer in Photosensitive Materials

Introduction

Paul Stahlhofen, located in Wiesbaden, Germany, is a distinguished inventor known for his significant contributions to the field of photosensitive materials. With an impressive portfolio of 34 patents, his innovations have paved the way for advancements in recording and printing technologies. His focus on creating efficient and effective photosensitive solutions showcases his dedication to the field.

Latest Patents

Among his latest patents, Stahlhofen has developed several notable inventions. One such invention is a photosensitive mixture containing an ester or amide of a 1,2-naphthoquinonediazide sulfonic or carboxylic acid. This mixture features a phenolic resin that remains soluble in aqueous-alkaline solutions yet insoluble in water, complemented by a speed enhancer compound. The innovation enhances photospeed for recording materials intended for the production of printing forms, without compromising copying or printing behavior.

Another of his notable patents involves a process for producing images on a photosensitive material. This method utilizes a support structure with a normally positive-working photosensitive layer that is activated by ultraviolet light. Furthermore, imaging is achieved through thermal energy using specific compounds that create a strong acid upon exposure, allowing the utilization of digital techniques for efficient image production.

Career Highlights

Stahlhofen's career has seen him contribute to renowned companies such as Hoechst Aktiengesellschaft and Hoechst Celanese Corporation. His roles in these organizations allowed him to leverage his inventive skills to develop cutting-edge photosensitive materials that have had a lasting impact on the industry.

Collaborations

Throughout his career, Paul Stahlhofen has collaborated with notable figures in the field, including Dieter Mohr and Rainer Beutel. These collaborations have bolstered his work, further enhancing the innovative processes and materials he has developed.

Conclusion

Paul Stahlhofen's myriad contributions to the field of photosensitive materials demonstrate his status as an influential inventor. His latest patents and career achievements reflect a commitment to innovation that continues to shape advancements in recording and printing technologies. As the industry evolves, the impact of his work is likely to resonate for years to come.

Profile summary based on public USPTO records.

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]