Granted Patent
Utility
US 4,311,414 · App. 06/126,061
Pile wiper seal
Inventor:
Morris G. Baldridge
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Feb 29, 1980
Inventor
Morris G. Baldridge
Assignee (at issue)
Halliburton
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.