Granted Patent
Utility
US 4,508,335 · App. 06/465,151
Sit-up exerciser
Inventors:
Robert C. Kelley, Ira J. Silberman
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Feb 9, 1983
Inventors
Robert C. Kelley
Ira J. Silberman
Assignee (at issue)
Diversified Products, LLC
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.