Granted Patent
Utility
US 4,630,675 · App. 06/737,942
Drilling choke pressure limiting control system
Inventors:
Lawrence E. Neipling, Mark C. Flohr
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: May 28, 1985
Inventors
Lawrence E. Neipling
Mark C. Flohr
Assignee (at issue)
SMITH INTERNATIONAL, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.