For the Inventor, By the Inventor

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Columbus, OH, United States of America

Bellofram Corporation

USPTO Granted Patents = 15

Trademarks = 13

Forward Citations = 203

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8 inventors (with patents filed for the assignee):

Wilfred H St Laurent, Jr (8 out of 8 patents)

Christos Athanassiu (4 out of 6 patents)

Richard A Benson (2 out of 6 patents)

4. Chuang Ji (2 out of 2 patents)

5. Donald W Comstock (1 out of 1 patent)

6. Peter B Marchetti (1 out of 1 patent)

7. Wilfred St Laurent (1 out of 1 patent)

8. Daniel E Smith (1 out of 1 patent)

15 patents: Sort by Forward Citations

1. 12504090 - Slam shut thermally triggered valve (2025-12-23),

2. 11988299 - Slam shut thermally triggered valve (2024-05-21),

3. 4905720 - Current-to-pressure transducer with enhanced performance features (1990-03-06),

4. 4729398 - Current-to-pressure transducers (1988-03-08),

5. 4705458 - Fluid operated pump (1987-11-10),

6. 4674526 - Switching valve (1987-06-23),

7. 4466455 - Rolling diaphragm vacuum control with check valve (1984-08-21),

8. 4390036 - Rolling diaphragm vacuum control (1983-06-28),

9. 4263838 - Pneumatic positioner (1981-04-28),

10. 4253675 - Improvements of sealed shafts (1981-03-03),

11. 4244589 - Sealed shaft of reduced diameter (1981-01-13),

12. 4229010 - Self-aligning shaft seal (1980-10-21),

13. 4219042 - Pneumatic relay (1980-08-26),

14. 4208060 - Sealed shaft (1980-06-17),

15. 3969991 - Rolling diaphragm and rolling diaphragm devices (1976-07-20),

Bellofram Corporation is a leading manufacturer of high performance products and solutions including air pressure regulators, I/P transducers, air velocity sensors, and more. With over 50 years of experience, Bellofram has built a reputation for quality and reliability in the industrial automation and process control industries.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

15 Patents

#50 in Columbus, OH

#883 in Ohio

#21,026 in US

#39,846 in the World

Columbus, OH, United States of America

Bellofram Corporation

Forward Citations = 203

8 inventors:

Wilfred H St Laurent, Jr (8 out of 8 patents)

Christos Athanassiu (4 out of 6 patents)

Richard A Benson (2 out of 6 patents)

4. Chuang Ji (2 out of 2 patents)

5. Donald W Comstock (1 out of 1 patent)

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