Granted Patent
Utility
US 5,850,668 · App. 08/678,997
Self-evacuating vacuum cleaner
Inventors:
Robert C. Berfield, Randy L. Buss, Craig A. Seasholtz
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: Jul 12, 1996
Inventors
Robert C. Berfield
Randy L. Buss
Craig A. Seasholtz
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.