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L'air Liquide

USPTO Granted Patents = 61

% Expired Patents = 3.3

Trademarks = 1

Forward Citations = 598

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117 inventors (with patents filed for the assignee):

Michel Arnout (3 out of 7 patents)

Francis Bryselbout (2 out of 7 patents)

Franck Virey (2 out of 3 patents)

4. Philippe Queille (2 out of 10 patents)

5. Jean Foulard (2 out of 9 patents)

6. Jean-Luc Mizandjian (2 out of 4 patents)

7. Dominique Masurel (2 out of 2 patents)

8. Christian Barbe (2 out of 2 patents)

9. Gerard Loiseau (2 out of 4 patents)

10. Jean-Marie Friedt (2 out of 9 patents)

11. Roger Champain (2 out of 3 patents)

12. Michel Madsac (2 out of 3 patents)

13. Michel Roux (2 out of 2 patents)

14. Dominique Lampin (2 out of 2 patents)

15. Guy Bourdon (2 out of 2 patents)

Core Competencies:

Gas Purification

Cryogenic Distillation

High-Purity Gases

Membrane Gas Separation

Fluid Control

Electric Welding

Nitrogen Production

Oxygen Generation

Inert Atmosphere

Carburizing Process

Steel Manufacturing

Waste Incineration

61 patents: Sort by Forward Citations

1. 9406954 - Method of depollution and regeneration of a fuel cell electrode poisoned by sulfur compounds (2016-08-02),

2. 7942974 - Method of cleaning a film-forming apparatus (2011-05-17),

3. 7115174 - Method for producing and oxide layer on metallic elements (2006-10-03),

4. 6178921 - Method of improving breeding conditions in newborn pigs (2001-01-30),

5. 6178755 - Plant and process for supplying helium to a plurality of production lines (2001-01-30),

6. 6129780 - Process and device for purification of gas by adsorption with fixed (2000-10-10),

7. 6129778 - Process for supplying a consumption unit with gas at several pressures (2000-10-10),

8. 6128921 - Air distillation plant comprising a plurality of cryogenic distillation (2000-10-10),

9. 6050106 - Ultra high purity nitrogen and oxygen generator unit (2000-04-18),

10. 5983959 - Head for supplying a cryogenic liquid, transfer line and supply plant (1999-11-16),

11. 5932026 - Method of cleaning an inner wall of a mold by means of dry ice (1999-08-03),

12. 5702678 - Method for optimizing the temperature of a Claus unit (1997-12-30),

13. 5676762 - Process for distributing ultra high purity gases with minimized corrosion (1997-10-14),

14. 5478395 - Process for supplying a gas, especially of diborane and silane (1995-12-26),

15. 5447744 - Process for supplying a gas, especially of diborane and silane (1995-09-05),

Company Overview

L'air Liquide is a leading global player in the field of gas purification, specializing in the development and manufacturing of high-purity gases essential for various industrial applications. The company focuses on advanced technologies such as cryogenic distillation and membrane gas separation, enabling efficient nitrogen production and oxygen generation. With a strong emphasis on fluid control and electric welding, L'air Liquide serves a diverse range of sectors, contributing to innovations in energy, healthcare, and manufacturing across the globe.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

61 Patents

#114 in Paris

#415 in France

#11,930 in the World

L'air Liquide

Forward Citations = 598

117 inventors:

Michel Arnout (3 out of 7 patents)

Francis Bryselbout (2 out of 7 patents)

Franck Virey (2 out of 3 patents)

4. Philippe Queille (2 out of 10 patents)

5. Jean Foulard (2 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: L'air Liquide. Retrieved from https://idiyas.com/company/l-air-liquide

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

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]

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