Elbert N. Shawhan

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West Chester, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Data transmission in a drill string
- Patent number 4,390,975
- Issue date Jun 28, 1983
- NL Sperry-Sun, Inc.
- Elbert N. Shawhan
- E21 - EARTH DRILLING MINING
Information Patent Grant
Bit identification system for borehole acoustical telemetry system
- Patent number 4,156,229
- Issue date May 22, 1979
- Sperry-Sun, Inc.
- Elbert N. Shawhan
- E21 - EARTH DRILLING MINING
Information Patent Grant
Lock-in noise rejection circuit
- Patent number 4,019,148
- Issue date Apr 19, 1977
- Sperry-Sun, Inc.
- Elbert N. Shawhan
- E21 - EARTH DRILLING MINING