Granted Patent
Utility
US 4,984,633 · App. 07/424,092
Nozzle effect protectors, centralizers, and stabilizers and related methods
Inventors:
Friedrich H. Langer, Michael J. Woodward
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Oct 20, 1989
Inventors
Friedrich H. Langer
Michael J. Woodward
Assignee (at issue)
Weatherford Holding U.S., 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.