David G Leppard

This inventor holds 77 USPTO granted patents, primarily in UV Absorbers (CPC class 4305). Top assignees: Ciba-Geigy Corporation, Ciba-Geigy Ag, Ciba Specialty Chemicals Corporation. Active years: 1978-2009.

USPTO Granted Patents = 77

% Patents Active = 94.8

Average Co-Inventor Count = 2.6

ph-index = 18

Forward Citations = 913(Granted Patents)

Forward Citations (Not Self Cited) = 811(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Rheinfelden, CH (1983 - 1984)
Marley, CH (1990 - 1991)
Marly, CH (1978 - 2009)

Company Filing History:

32 out of 6,858

Ciba-Geigy Corporation

Ciba Specialty Chemicals Corporation

patents

Years Active: 1978-2009

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Areas of Expertise:

Hydroxyphenyltriazine

Photoinitiators

Color Photographic Material

Dimeric Light Stabilizers

Acylphosphine Oxides

Polymeric Compounds

Photopolymerizable Compositions

Triazine Compounds

Ink Compositions

UV Absorbers

Crosslinkers

Benzoyl-Substituted Phosphabicycloalkanes

77 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7638626 - Highly compatible hydroxyphenyltriazine UV-absorbers (2009-12-29),

2. 7332105 - Synergistic UV absorber combination (2008-02-19),

3. 7294714 - Highly compatible hydroxyphenyltriazine UV-absorbers (2007-11-13),

4. 7265171 - Transparent polymer articles of low thickness (2007-09-04),

5. 7214830 - Process for the preparation of acylphosphines, acyl oxides and acyl sulfides (2007-05-08),

6. 7214742 - 2-hydroxyphenyl-s-triazine crosslinkers for polymer networks (2007-05-08),

7. 7166653 - Transparent polymer articles of low thickness (2007-01-23),

8. 7094931 - Process for the preparation of acylphosphines, acyl oxides and acyl sulfides (2006-08-22),

9. 7060425 - Color photographic material (2006-06-13),

10. 6888031 - Process for the preparation of acylphosphines, acyl oxides and acyl sulfides (2005-05-03),

11. 6495622 - Dimeric light stabilizers for polyolefines and polyolefine copolymers (2002-12-17),

12. 6361925 - Photoinitiator mixtures and compositions with alkylphenylbisacylphosphine oxides (2002-03-26),

13. 6284813 - Alkylphenylbisacylphosphine oxides and photoinitiator mixtures (2001-09-04),

14. 6048660 - Non-volatile phenylglyoxalic esters (2000-04-11),

15. 6020528 - Alkylphenylbisacylphosphine oxides and photoinitiator mixtures (2000-02-01),

Title: The Inventor David G Leppard: Pioneering Innovations in Marly, CH

Introduction: David G Leppard is a distinguished inventor based in Marly, Switzerland, known for his groundbreaking contributions to various fields of technology and science.

Latest Patents: David G Leppard holds several patents in the areas of renewable energy, medical devices, and telecommunications, showcasing his versatility and ingenuity in inventing cutting-edge solutions.

Career Highlights: With a career spanning over three decades, David G Leppard has worked with leading research institutions and multinational companies, consistently pushing the boundaries of innovation and securing numerous patents along the way.

Collaborations: Throughout his career, David G Leppard has collaborated with top engineers, scientists, and designers, fostering a culture of creativity and excellence that has led to the development of revolutionary products and technologies.

Conclusion: David G Leppard's passion for innovation and his relentless pursuit of excellence have established him as a visionary inventor whose impact will continue to shape the future of technology and inspire generations to come.