Granted Patent
Utility
US 4,606,563 · App. 06/664,214
Conduit fixture for tank wall
Inventors:
Robert C. Berfield, Robert L. Crevling, Jr.
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Oct 24, 1984
Inventors
Robert C. Berfield
Robert L. Crevling, Jr.
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.