IP Library › Granted Patent US 4,390,975
Granted Patent Utility
US 4,390,975 · App. 06/139,046

Data transmission in a drill string

Inventor: Elbert N. Shawhan
Patented Case View Patent ↗
Granted: Jun 28, 1983 Filed: Apr 10, 1980
Inventor
Elbert N. Shawhan
Assignee (at issue)
NL Sperry-Sun, Inc.

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Quick Facts
Patent No.
US 4,390,975
App. No.
06/139,046
Filed
1980-04-10
Granted
1983-06-28
Kind
A