Granted Patent
Utility
US 4,640,697 · App. 06/782,509
Vacuum cleaner construction
Inventor:
Roy O. Erickson, Jr.
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Oct 1, 1985
Inventor
Roy O. Erickson, Jr.
Assignee (at issue)
REXAIR LLC
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.