Granted Patent
Utility
US 4,196,816 · App. 05/847,639
Heavy duty crane
Inventors:
James R. Dvorsky, Robert J. Vrba
Patented Case
View Patent ↗
Granted: Apr 8, 1980
Filed: Nov 1, 1977
Inventors
James R. Dvorsky
Robert J. Vrba
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.