Granted Patent
Utility
US 4,901,475 · App. 07/225,198
Externally mounted latch for slidable sash window
Inventor:
Harold Simpson
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Jul 28, 1988
Inventor
Harold Simpson
Assignee (at issue)
Ashland Products, Inc.
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.