Granted Patent
Utility
US 4,280,245 · App. 06/122,380
Sound dome for electric vacuum cleaner
Inventor:
Kenneth R. Hiester
Patented Case
View Patent ↗
Granted: Jul 28, 1981
Filed: Feb 19, 1980
Inventor
Kenneth R. Hiester
Assignee (at issue)
SHOP VAC 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.