Granted Patent
Utility
US 4,638,115 · App. 06/853,702
Three service afterset
Inventor:
Richard D. Benscoter
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Apr 18, 1986
Inventor
Richard D. Benscoter
Assignee (at issue)
BUTLER MANUFACTURING COMPANY
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.