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Madison, CT, United States of America

Stonehart Associates Inc.

USPTO Granted Patents = 21

Forward Citations = 478

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13 inventors (with patents filed for the assignee):

Paul Stonehart (10 out of 12 patents)

Masahiro Watanabe (9 out of 26 patents)

Kazunori Tsurumi (8 out of 23 patents)

4. Toshihide Nakamura (5 out of 8 patents)

5. Nobuo Yamamoto (5 out of 5 patents)

6. Koichi Sakairi (3 out of 15 patents)

7. Noriaki Hara (3 out of 8 patents)

8. Tomoyuki Tada (2 out of 10 patents)

9. Yumi Yamamoto (2 out of 2 patents)

10. Haruko Sugimoto (2 out of 2 patents)

11. Takeshi Tozawa (1 out of 3 patents)

12. Masahhiro Watanabe (1 out of 1 patent)

13. Nobuhito Toshima (1 out of 1 patent)

21 patents: Sort by Forward Citations

1. 5922487 - Anode electrocatalyst for fuel cell and process of preparing same (1999-07-13),

2. 5871552 - Process of preparing electrode for solid polymer electrolyte fuel cell (1999-02-16),

3. 5843519 - Process for forming a catalyst layer on an electrode by spray-drying (1998-12-01),

4. 5800938 - Sandwich-type solid polymer electrolyte fuel cell (1998-09-01),

5. 5728485 - Electrode for polymer electrolyte electrochemical cell and process of (1998-03-17),

6. 5607785 - Polymer electrolyte electrochemical cell and process of preparing same (1997-03-04),

7. 5593934 - Platinum alloy catalyst (1997-01-14),

8. 5539002 - Ion exchange resins with decreased resistance to ionic conductivity (1996-07-23),

9. 5523181 - Polymer solid-electrolyte composition and electrochemical cell using the (1996-06-04),

10. 5480851 - Process of preparing catalyst supporting highly dispersed metal particles (1996-01-02),

11. 5472799 - Solid polymer electrolyte fuel cell (1995-12-05),

12. 5453332 - Electrode structure for fuel cell (1995-09-26),

13. 5374598 - Process of preparing metal supported catalyst having high surface area (1994-12-20),

14. 5350727 - Process of preparing catalyst supporting highly dispersed platinum (1994-09-27),

15. 5294232 - Process of preparing solid polymer electrolyte type fuel cell (1994-03-15),

Stonehart Associates Inc. is a leading consulting firm specializing in financial advisory services. With a team of experienced professionals, we provide strategic guidance and solutions to help businesses thrive and grow. Our services include investment management, risk assessment, and financial planning. Contact us today to learn how we can support your business goals.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

21 Patents

#2 in Madison, CT

#347 in Connecticut

#15,187 in US

#29,088 in the World

Madison, CT, United States of America

Stonehart Associates Inc.

Forward Citations = 478

13 inventors:

Paul Stonehart (10 out of 12 patents)

Masahiro Watanabe (9 out of 26 patents)

Kazunori Tsurumi (8 out of 23 patents)

4. Toshihide Nakamura (5 out of 8 patents)

5. Nobuo Yamamoto (5 out of 5 patents)

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