Granted Patent
Utility
US 6,041,487 · App. 09/073,660
Method for producing sealing surfaces on a tubular member
Inventors:
Edward O. Banker, Erich F. Klementich
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: May 6, 1998
Inventors
Edward O. Banker
Erich F. Klementich
Assignee (at issue)
Marubeni Tubulars, 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.