For the Inventor, By the Inventor

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Houston, TX, United States of America

Duval Corporation

USPTO Granted Patents = 17

Trademarks = 3

Forward Citations = 161

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18 inventors (with patents filed for the assignee):

Leonard R Ochs (4 out of 4 patents)

Archibald W Fletcher (3 out of 4 patents)

Frank E Lamb (3 out of 3 patents)

4. Melvin S Cook (2 out of 2 patents)

5. George E Atwood (2 out of 2 patents)

6. Charles D'a Hunt (2 out of 5 patents)

7. Ralph Ruggiero (2 out of 2 patents)

8. Wallace H Long (2 out of 2 patents)

9. David H Vroom (1 out of 10 patents)

10. Ben E Adams (1 out of 2 patents)

11. Abraham Sadan (1 out of 11 patents)

12. Edward J Gidak, Jr (1 out of 1 patent)

13. Douglas E Cochran (1 out of 1 patent)

14. Phillip O Tyree (1 out of 1 patent)

15. Charles Burnett (1 out of 1 patent)

17 patents: Sort by Forward Citations

1. 4634467 - Hydrometallurgical process for copper recovery (1987-01-06),

2. 4551213 - Recovery of gold (1985-11-05),

3. 4545972 - Process for recovery of metal chloride and cuprous chloride complex salts (1985-10-08),

4. 4544460 - Removal of potassium chloride as a complex salt in the (1985-10-01),

5. 4536214 - Metal sulphide extraction (1985-08-20),

6. 4518418 - Electron beam refinement of metals, particularly copper (1985-05-21),

7. 4517064 - Electrolytic cell (1985-05-14),

8. 4513859 - Conveyor with readily replaceable roller (1985-04-30),

9. 4491279 - Portable rock crushing and conveying system (1985-01-01),

10. 4488902 - Horizontal, multistage electron beam refinement of metals with recycle (1984-12-18),

11. 4475771 - Cyclic solution mining of borate ores (1984-10-09),

12. 4342592 - Non-polluting process for recovery of precious metal values from ores (1982-08-03),

13. 4272341 - Process for recovery of metal values from lead-zinc ores, even those (1981-06-09),

14. 4147309 - Hydroset pressure relief system (1979-04-03),

15. 4045335 - Beneficiation of kieserite and langbeinite from a langbeinite ore (1977-08-30),

Duval Corporation is a leading provider of innovative solutions in the manufacturing industry. With a strong focus on quality and efficiency, we specialize in producing high-quality products for a wide range of applications. Our commitment to excellence and customer satisfaction sets us apart from the competition. Visit our website to learn more about our services and capabilities.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

17 Patents

#304 in Houston, TX

#1,130 in Texas

#18,300 in US

#34,819 in the World

Houston, TX, United States of America

Duval Corporation

Forward Citations = 161

18 inventors:

Leonard R Ochs (4 out of 4 patents)

Archibald W Fletcher (3 out of 4 patents)

Frank E Lamb (3 out of 3 patents)

4. Melvin S Cook (2 out of 2 patents)

5. George E Atwood (2 out of 2 patents)

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