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For the Inventor, By the Inventor

Houston, TX, United States of America

Nl Sperry Sun, Inc.


USPTO Granted Patents = 12

Forward Citations = 270

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14 inventors (with patents filed for the assignee):

goldMedal Anthony W Russell (5 out of 21 patents)

silverMedal Michael King Russell (4 out of 29 patents)

bronzeMedal Hwa-shan Ho (1 out of 11 patents)

4.  Kenneth S Evans (1 out of 3 patents)

5.  Steven W Powell (1 out of 2 patents)

6.  Elbert N Shawhan (1 out of 3 patents)

7.  Joshua M Jackson (1 out of 6 patents)

8.  Miles A Smither (1 out of 16 patents)

9.  H Eugene Sharp (1 out of 3 patents)

10.  Vernon E Koval (1 out of 1 patent)

11.  James G Stockton (1 out of 2 patents)

12.  Peter J Marlow (1 out of 1 patent)

13.  Manmohan S Kalsi (1 out of 1 patent)

14.  Colin Arlott (1 out of 1 patent)


12 patents:

1. 4848144 - Method of predicting the torque and drag in directional wells (1989-07-18),
2. 4819336 - Method of determining the orientation of a surveying instrument in a (1989-04-11),
3. 4810105 - Bearing sleeves (1989-03-07),
4. 4802150 - Mud pressure control system with magnetic torque transfer (1989-01-31),
5. 4794336 - Apparatus for surveying a borehole comprising a magnetic measurement (1988-12-27),
6. 4636995 - Mud pressure control system (1987-01-13),
7. 4562559 - Borehole acoustic telemetry system with phase shifted signal (1985-12-31),
8. 4535429 - Apparatus for signalling within a borehole while drilling (1985-08-13),
9. 4507958 - Surveying of a borehole for position determination (1985-04-02),
10. 4399877 - Continuous borehole telemetry system and method (1983-08-23),
11. 4393598 - Borehole tool (1983-07-19),
12. 4390975 - Data transmission in a drill string (1983-06-28),
Company Overview
Nl Sperry Sun, Inc. is a prominent provider of advanced drilling technologies and services, primarily serving the oil and gas industry. Based in Houston, Texas, the company specializes in the development and manufacturing of innovative downhole tools and measurement systems that enhance drilling efficiency and accuracy. With a strong focus on research and technology, Nl Sperry Sun is dedicated to delivering solutions that improve operational performance and safety in complex drilling environments.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

12 Patents

#417 in Houston, TX

#1,593 in Texas

#25,578 in US

#48,209 in the World

Houston, TX (US)
Houston, TX, United States of America

Nl Sperry Sun, Inc.

Forward Citations = 270

14 inventors:

goldMedal Anthony W Russell (5 out of 21 patents)

silverMedal Michael King Russell (4 out of 29 patents)

bronzeMedal Hwa-shan Ho (1 out of 11 patents)

4.  Kenneth S Evans (1 out of 3 patents)

5.  Steven W Powell (1 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nl Sperry Sun, Inc.. Retrieved from https://idiyas.com/company/nl-sperry-sun

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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