Granted Patent
Utility
US 4,640,077 · App. 06/572,891
Clip for a suspended ceiling
Inventor:
Stephen Hall
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Jan 23, 1984
Inventor
Stephen Hall
Assignee (at issue)
Intalite International N.V.
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.