Granted Patent
Utility
US 4,407,617 · App. 06/295,154
Combination manual and automatic unlocking mechanism for trailer hitch head
Inventors:
James C. Hammonds, Ronald D. VanDyke
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Aug 21, 1981
Inventors
James C. Hammonds
Ronald D. VanDyke
Assignee (at issue)
ACF Industries Incorporated
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.