Granted Patent
Utility
US 6,116,286 · App. 09/123,395
Pneumatic pipe plug
Inventors:
Robert Hooper, William Dean Pearson
Patented Case
View Patent ↗
Granted: Sep 12, 2000
Filed: Jul 15, 1998
Inventors
Robert Hooper
William Dean Pearson
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.