Granted Patent
Utility
US 4,404,712 · App. 06/315,725
Sling hook
Inventors:
Melvin M. Northe, Dean W. Larson
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Oct 28, 1981
Inventors
Melvin M. Northe
Dean W. Larson
Assignee (at issue)
ESCO GROUP 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.