Granted Patent
Utility
US 5,257,432 · App. 07/972,256
Rod wiper
Inventor:
J. Thomas Duke
Patented Case
View Patent ↗
Granted: Nov 2, 1993
Filed: Nov 5, 1992
Inventor
J. Thomas Duke
Assignee (at issue)
Macrotech Fluid Sealing, 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.