Granted Patent
Utility
US 4,716,987 · App. 07/039,308
Swimming pool ladder securement device
Inventor:
Albert W. Lindberg, Jr.
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Apr 16, 1987
Inventor
Albert W. Lindberg, Jr.
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.