Granted Patent
Utility
US 4,808,039 · App. 07/149,719
Coupling mechanism for interconnecting sealing plates that are to be built into a sealing wall
Inventor:
Joachim Fischer
Patented Case
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Granted: Feb 28, 1989
Filed: Jan 29, 1988
Inventor
Joachim Fischer
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.