Granted Patent
Utility
US 4,673,833 · App. 06/587,723
Electromagnetic vibratory exciter
Inventors:
Arthur L. Dean, Robert E. Kraft, Kenneth M. Marshall
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Mar 8, 1984
Inventors
Arthur L. Dean
Robert E. Kraft
Kenneth M. Marshall
Assignee (at issue)
FMC 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.