IP Library › Granted Patent US 4,890,968
Granted Patent Utility
US 4,890,968 · App. 07/311,013

Stackable roofing washer

Inventors: John R. Beach, Syed R. Hasan, Donald W. Noren, Craig A. Hindman, Ernest S. Santi
Patented Case View Patent ↗
Granted: Jan 2, 1990 Filed: Feb 15, 1989
Inventors
John R. Beach
Syed R. Hasan
Donald W. Noren
Craig A. Hindman
Ernest S. Santi
Assignee (at issue)
ILLINOIS TOOL WORKS INC.

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Quick Facts
Patent No.
US 4,890,968
App. No.
07/311,013
Filed
1989-02-15
Granted
1990-01-02
Kind
A