For the Inventor, By the Inventor

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Bellaire, TX, United States of America

Anderson, Greenwood & Co.

USPTO Granted Patents = 16

Forward Citations = 270

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13 inventors (with patents filed for the assignee):

Walter W Powell (3 out of 16 patents)

Michael D McNeely (3 out of 18 patents)

Marion L Schomer (3 out of 3 patents)

4. John E Hewson (2 out of 4 patents)

5. William L Anderson, Jr (2 out of 5 patents)

6. Lomis Slaughter, Jr (2 out of 2 patents)

7. Michael E Moyers (2 out of 2 patents)

8. Walter T Roush (1 out of 4 patents)

9. Larry A Sample (1 out of 5 patents)

10. Irvin B Weise (1 out of 1 patent)

11. Oscar Dane (1 out of 1 patent)

12. Edsel O Ross (1 out of 1 patent)

13. Cleo M Bickford (1 out of 4 patents)

16 patents: Sort by Forward Citations

1. 4821772 - Dual active selector valve (1989-04-18),

2. 4746095 - Bonnet lock (1988-05-24),

3. 4705065 - Safety relief system for control or vent valves (1987-11-10),

4. 4682495 - Testing device for pilot valves (1987-07-28),

5. 4674530 - Pressure relief device for vessels (1987-06-23),

6. 4632143 - Pressure boost attachment for pilot valves (1986-12-30),

7. 4602657 - Valve manifold for a differential pressure transmitter (1986-07-29),

8. 4453417 - Unitized measurement instrument connector apparatus (1984-06-12),

9. 4445531 - Pilot for safety valve (1984-05-01),

10. 4429711 - Multivalve manifold interlock and control system (1984-02-07),

11. 4388940 - Pressure relief device (1983-06-21),

12. 4319492 - Pressure transmitter manifold (1982-03-16),

13. 4222408 - Check valve (1980-09-16),

14. 4188973 - Check valve (1980-02-19),

15. 4182362 - Differential transmitter and manifold mounting (1980-01-08),

Anderson, Greenwood & Co. is a leading manufacturer of high-quality pressure relief valves and fluid control systems for the oil and gas industry. With over 70 years of experience, we provide reliable solutions to meet the rigorous demands of the industry. Our products are known for their durability, performance, and safety features.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

16 Patents

#3 in Bellaire, TX

#1,192 in Texas

#19,278 in US

#36,652 in the World

Bellaire, TX, United States of America

Anderson, Greenwood & Co.

Forward Citations = 270

13 inventors:

Walter W Powell (3 out of 16 patents)

Michael D McNeely (3 out of 18 patents)

Marion L Schomer (3 out of 3 patents)

4. John E Hewson (2 out of 4 patents)

5. William L Anderson, Jr (2 out of 5 patents)

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