Granted Patent
Utility
US 6,119,304 · App. 09/281,671
Self-evacuating vacuum cleaner
Inventors:
Robert C. Berfield, Randy L. Buss, Marcus Rhone
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Mar 30, 1999
Inventors
Robert C. Berfield
Randy L. Buss
Marcus Rhone
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.