Granted Patent
Utility
US 4,222,145 · App. 05/847,905
Vacuum cleaner carriage and tank assembly
Inventor:
Dale E. Lowder
Patented Case
View Patent ↗
Granted: Sep 16, 1980
Filed: Nov 2, 1977
Inventor
Dale E. Lowder
Assignee (at issue)
Clarke-Gravely Corporation
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.