Granted Patent
Utility
US 4,623,366 · App. 06/778,430
Grid element for lid of a cannister type vacuum cleaner
Inventors:
Robert C. Berfield, Rudolph W. Wacek, Craig A. Seasholtz
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Sep 20, 1985
Inventors
Robert C. Berfield
Rudolph W. Wacek
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.