Granted Patent
Utility
US 4,387,893 · App. 06/261,260
Abdominal weight lifting apparatus
Inventor:
Dan D. Baldwin
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: May 6, 1981
Inventor
Dan D. Baldwin
Assignee (at issue)
Nautilus Sports Medical Industries, 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.