Granted Patent
Utility
US 5,261,192 · App. 07/836,636
Surface cleaning apparatus
Inventor:
Robert T. Nelson
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Feb 14, 1992
Inventor
Robert T. Nelson
Assignee (at issue)
Nelco Manufacturing Corp.
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.