Granted Patent
Utility
US 5,228,524 · App. 07/846,500
Fluid system for controlling fluid losses during hydrocarbon recovery operations
Inventors:
Michael H. Johnson, Kelvin Smejkal
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Feb 25, 1992
Inventors
Michael H. Johnson
Kelvin Smejkal
Assignee (at issue)
Baker Hughes Holdings LLC
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.