Granted Patent
Utility
US 5,257,993 · App. 07/771,723
Top-entry rod retainer
Inventors:
Marc A. Asher, Robert Gaines, Walter E. Stripgen, Frank S. Janson, William L. Carson, Terrence M. Stahurski, Charles F. Heinig
Patented Case
View Patent ↗
Granted: Nov 2, 1993
Filed: Oct 4, 1991
Inventors
Marc A. Asher
Robert Gaines
Walter E. Stripgen
Frank S. Janson
William L. Carson
Terrence M. Stahurski
Charles F. Heinig
Assignee (at issue)
AcroMed 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.