Granted Patent
Utility
US 4,257,604 · App. 06/045,139
In-line drop targets
Inventors:
Irwin J. Grabel, Glenn R. Andersen
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Jun 4, 1979
Inventors
Irwin J. Grabel
Glenn R. Andersen
Assignee (at issue)
Bally Manufacturing 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.