Granted Patent
Utility
US 4,457,725 · App. 06/293,766
Hydraulic trim tile system for outboard propulsion units using a pressure amplifier
Inventors:
Calvin V. Kern, Lawrence P. Zepp
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Aug 17, 1981
Inventors
Calvin V. Kern
Lawrence P. Zepp
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.