Granted Patent
Utility
US 5,769,021 · App. 08/815,962
Amphibious craft
Inventor:
Robert D. Schad
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Mar 13, 1997
Inventor
Robert D. Schad
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.