Granted Patent
Utility
US 5,035,526 · App. 07/582,688
Concealed rivet element and setting method for ring binder construction
Inventors:
Edward W. Cooper, Peter Dewberry
Patented Case
View Patent ↗
Granted: Jul 30, 1991
Filed: Sep 13, 1990
Inventors
Edward W. Cooper
Peter Dewberry
Assignee (at issue)
Acco World 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.