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Houston, TX, United States of America

Duval Corporation

USPTO Granted Patents = 17

Trademarks = 2

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 12 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),

Company Overview

Duval Corporation, based in Houston, TX, specializes in advanced engineering solutions and manufacturing processes tailored for the energy sector. The company focuses on developing innovative technologies that enhance operational efficiency and safety in various applications, including oil and gas exploration and production. With a commitment to research and development, Duval Corporation aims to address the evolving challenges of the industry while promoting sustainable practices and technological advancements.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

17 Patents

#310 in Houston, TX

#1,149 in Texas

#18,894 in US

#35,918 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)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Duval Corporation. Retrieved from https://idiyas.com/company/duval

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

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