Granted Patent
Utility
US 5,018,329 · App. 07/528,914
Attachment of roofing washer with heat-sealed screw-washer assemblage
Inventors:
S. Riaz Hasan, Louis Thomas
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: May 25, 1990
Inventors
S. Riaz Hasan
Louis Thomas
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.