Granted Patent
Utility
US 4,674,921 · App. 06/607,313
Seawall
Inventor:
Lawrence Berger
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: May 4, 1984
Inventor
Lawrence Berger
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.