Granted Patent
Utility
US 4,650,200 · App. 06/803,254
Dolly with tank holding device
Inventors:
Robert C. Berfield, Robert L. Crevling, Jr., Donald G. Rightnour
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Dec 2, 1985
Inventors
Robert C. Berfield
Robert L. Crevling, Jr.
Donald G. Rightnour
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.