Granted Patent
Utility
US 5,975,853 · App. 08/975,643
Cover for a ceiling aperture
Inventor:
Robert W. Lackey
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: Nov 21, 1997
Inventor
Robert W. Lackey
Assignee (at issue)
R.W.L. Consultants Limited
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.