For the Inventor, By the Inventor

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Houston, TX, United States of America

Varco Shaffer, Inc.

USPTO Granted Patents = 15

CIPO Patents = 5

Trademarks = 4

Forward Citations = 859

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23 inventors (with patents filed for the assignee):

James Dennis Brugman (5 out of 17 patents)

Melvyn F Whitby (3 out of 24 patents)

David L O'Donnell (3 out of 3 patents)

4. Bryce A Levett (3 out of 3 patents)

5. Mark A Merit (2 out of 6 patents)

6. Tri Canh Le (2 out of 3 patents)

7. Hubert L Elkins (2 out of 6 patents)

8. Paul L Tasson (2 out of 3 patents)

9. Raul Araujo (1 out of 12 patents)

10. David Wayne Martin (1 out of 3 patents)

11. Christopher Dale Johnson (1 out of 11 patents)

12. George Tisdale (1 out of 3 patents)

13. Ronald W Yater (1 out of 1 patent)

14. Esteban Palomo, Jr (1 out of 1 patent)

15. Chris Dale Johnson (1 out of 1 patent)

15 patents: Sort by Forward Citations

1. 7380589 - Subsea coiled tubing injector with pressure compensation (2008-06-03),

2. 6857634 - BOP assembly with metal inserts (2005-02-22),

3. 6719042 - Shear ram assembly (2004-04-13),

4. 6374925 - Well drilling method and system (2002-04-23),

5. 6244560 - Blowout preventer ram actuating mechanism (2001-06-12),

6. 6192680 - Subsea hydraulic control system (2001-02-27),

7. 5975484 - Door connectors (1999-11-02),

8. 5897094 - BOP with improved door connectors (1999-04-27),

9. 5778918 - Pilot valve with improved cage (1998-07-14),

10. 5735502 - BOP with partially equalized ram shafts (1998-04-07),

11. 5662171 - Rotating blowout preventer and method (1997-09-02),

12. 5588491 - Rotating blowout preventer and method (1996-12-31),

13. 5575452 - Blowout preventer with ram wedge locks (1996-11-19),

14. 5505426 - Hydraulically controlled blowout preventer (1996-04-09),

15. 5400857 - Oilfield tubular shear ram and method for blowout prevention (1995-03-28),

Varco Shaffer, Inc. is a leading provider of drilling equipment and technologies for the oil and gas industry. With a focus on innovation and efficiency, Varco Shaffer offers a wide range of products including blowout preventers, drilling risers, and well control systems. The company is known for its high-quality products and commitment to safety and environmental sustainability.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

15 Patents

#339 in Houston, TX

#1,270 in Texas

#20,400 in US

#38,669 in the World

Houston, TX, United States of America

Varco Shaffer, Inc.

Forward Citations = 859

23 inventors:

James Dennis Brugman (5 out of 17 patents)

Melvyn F Whitby (3 out of 24 patents)

David L O'Donnell (3 out of 3 patents)

4. Bryce A Levett (3 out of 3 patents)

5. Mark A Merit (2 out of 6 patents)

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