Granted Patent
Utility
US 4,336,934 · App. 06/238,807
Rowing exercise machine
Inventors:
Michael W. Hanagan, Donald I. Schoeck
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Feb 27, 1981
Inventors
Michael W. Hanagan
Donald I. Schoeck
Assignee (at issue)
Corbin Gentry, 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.