For the Inventor, By the Inventor

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Houston, TX, United States of America

Pennzoil Company

USPTO Granted Patents = 39

Trademarks = 15

Forward Citations = 398

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26 inventors (with patents filed for the assignee):

John B Sardisco (17 out of 17 patents)

Erhart K Drechsel (14 out of 14 patents)

Dysart E Holcomb (7 out of 7 patents)

4. Louis E Kidwell, Jr (5 out of 6 patents)

5. Arpad M Magyar (4 out of 5 patents)

6. Asoke K Deysarkar (2 out of 3 patents)

7. Tom C Holloway (2 out of 2 patents)

8. Jia-Wen Lin (2 out of 2 patents)

9. James D Allen (2 out of 2 patents)

10. D V Gupta (1 out of 12 patents)

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

12. James R Stewart, Jr (1 out of 1 patent)

13. Walter Edmund Steinmetz (1 out of 1 patent)

14. Bert H Clampitt (1 out of 5 patents)

15. Ralph E Worthington (1 out of 1 patent)

39 patents: Sort by Forward Citations

1. 4866659 - Method for selection of mining and drilling sites using synthesized (1989-09-12),

2. 4672545 - Method and apparatus for synthesizing three dimensional seismic data (1987-06-09),

3. 4670500 - Surface coating composition (1987-06-02),

4. 4670171 - Surface cleaner composition (1987-06-02),

5. D289376 - Bottle or similar article (1987-04-21),

6. 4648263 - Support and centering attachments for sensitive viscometers (1987-03-10),

7. 4623447 - Breaking middle phase emulsions (1986-11-18),

8. 4613446 - Gelled detergent composition and cleaning pads containing same (1986-09-23),

9. 4609406 - Rust conversion coatings (1986-09-02),

10. 4501825 - Tire sealer and inflator (1985-02-26),

11. 4479923 - Production of phosphoric acid and additional products from phosphate ore (1984-10-30),

12. 4450069 - Method for upgrading diene-containing hydrocarbon mixtures (1984-05-22),

13. 4435370 - Preparation of monocalcium phosphate and/or phosphoric acid from (1984-03-06),

14. 4397425 - Grinding apparatus (1983-08-09),

15. 4393032 - Production of phosphoric acid and additional products from phosphate ore (1983-07-12),

Pennzoil is an American oil company that produces motor oil, oil filters, transmission fluids, and other automotive products. The company is known for its high-quality motor oil and lubricants, offering products for both consumer and commercial use. Pennzoil has a long history in the oil industry and continues to be a trusted brand for automotive maintenance.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

39 Patents

#140 in Houston, TX

#487 in Texas

#8,543 in US

#16,935 in the World

Houston, TX, United States of America

Pennzoil Company

Forward Citations = 398

26 inventors:

John B Sardisco (17 out of 17 patents)

Erhart K Drechsel (14 out of 14 patents)

Dysart E Holcomb (7 out of 7 patents)

4. Louis E Kidwell, Jr (5 out of 6 patents)

5. Arpad M Magyar (4 out of 5 patents)

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