Granted Patent
Utility
US 4,828,560 · App. 07/156,717
Spring ring tissue expander
Inventor:
Charles J. Heyler, III
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Feb 17, 1988
Inventor
Charles J. Heyler, III
Assignee (at issue)
McGman Medical 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.