Granted Patent
Utility
US 4,432,419 · App. 06/194,194
Retrievable plug
Inventor:
Steven G. Streich
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Oct 6, 1980
Inventor
Steven G. Streich
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.