Granted Patent
Utility
US 5,163,580 · App. 07/665,157
Package of stacked roofing washers and related methods
Inventors:
John R. Beach, Donald L. Van Erden
Patented Case
View Patent ↗
Granted: Nov 17, 1992
Filed: Mar 6, 1991
Inventors
John R. Beach
Donald L. Van Erden
Assignee (at issue)
ILLINOIS TOOL WORKS INC.
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.