Granted Patent
Utility
US 5,898,987 · App. 08/851,225
Method of installing acoustical ceiling grid
Inventor:
Daniel Onofrio
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: May 5, 1997
Inventor
Daniel Onofrio
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.