Granted Patent
Utility
US 4,581,850 · App. 06/627,989
Combination pivot corner and slide guide for sash window
Inventor:
Harold Simpson
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Jul 5, 1984
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.