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For the Inventor, By the Inventor

Northfield, IL, United States of America

Stepan Company


USPTO Granted Patents = 221



Trademarks = 60

Forward Citations = 1,764

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218 inventors (with patents filed for the assignee):

goldMedal Randal J Bernhardt (52 out of 56 patents)

silverMedal Ronald Anthony Masters (31 out of 33 patents)

bronzeMedal Patrick Shane Wolfe (29 out of 30 patents)

4.  Aaron Brown (27 out of 49 patents)

5.  Dennis S Murphy (25 out of 33 patents)

6.  Andrew D Malec (23 out of 23 patents)

7.  Dave R Allen (22 out of 22 patents)

8.  Gregory Paul Dado (22 out of 29 patents)

9.  Xue Min Dong (20 out of 20 patents)

10.  Patti Skelton (19 out of 19 patents)

11.  Warren A Kaplan (18 out of 18 patents)

12.  Branko Sajic (16 out of 18 patents)

13.  Marcos Alonso (16 out of 16 patents)

14.  Irene Shapiro (16 out of 16 patents)

15.  Renee Luka (15 out of 15 patents)


Core Competencies:
Esterquat Compositions
Polymeric Dispersants
Low-Temperature Oil Wells
Solder Flux Composition
Rhamnolipids Production
Polyol Blends
Corrosion-Inhibiting Surfactants
Hydraulic Fracturing
Polyurethane Applications
Microemulsion Flowback Aids
Fatty Alcohol Derivatives
Adhesive Compositions

221 patents:

1. 12486472 - Concentrated liquid esterquat compositions (2025-12-02),
2. 12398246 - Polymeric dispersants from phenyl glycidyl ether (2025-08-26),
3. 12291673 - Polyester diverting agents for low-temperature oil wells (2025-05-06),
4. 12285825 - Non-aqueous solder flux composition (2025-04-29),
5. 12270010 - Reduced-residue hard surface cleaner and method for determining film/streak (2025-04-08),
6. 12180116 - Alkyl sulfate / alkyl ether sulfate gypsum foamer (2024-12-31),
7. 12129434 - Method for boosting viscosity of a fracturing fluid (2024-10-29),
8. 12104008 - Solid-solid phase-change materials (2024-10-01),
9. 12043857 - Enhanced production of rhamnolipids using at least two carbon sources (2024-07-23),
10. 12037489 - Polyol blends and rigid foams with improved low-temperature r-values (2024-07-16),
11. 11993708 - Polyol blends and rigid foams with improved low-temperature R-values (2024-05-28),
12. 11970571 - Polyol-epoxide polymers for NVH damping applications (2024-04-30),
13. 11939434 - Polymeric dispersants from phenyl glycidyl ether (2024-03-26),
14. 11919993 - Polyols for low-VOC polyurethane applications (2024-03-05),
15. 11898096 - Polyester diverting agents for low-temperature oil wells (2024-02-13),
Stepan Company is a leading specialty and intermediate chemical manufacturer. They produce a wide range of products used in various industries, such as consumer goods, automotive, construction, and agriculture. With over 80 years of experience, Stepan Company prides itself on innovation and sustainable practices. They are committed to providing high-quality products and solutions to their global customer base.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 30 2025

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221 Patents

#5 in Northfield, IL

#123 in Illinois

#1,824 in US

#3,760 in the World

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Northfield, IL, United States of America

Stepan Company

Forward Citations = 1,764

218 inventors:

goldMedal Randal J Bernhardt (52 out of 56 patents)

silverMedal Ronald Anthony Masters (31 out of 33 patents)

bronzeMedal Patrick Shane Wolfe (29 out of 30 patents)

4.  Aaron Brown (27 out of 49 patents)

5.  Dennis S Murphy (25 out of 33 patents)

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