Granted Patent
Utility
US 4,686,753 · App. 06/611,581
Coil spring assembly machine
Inventors:
Henry Zapletal, Horst F. Wentzek, George M. Chembakaffery
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: May 17, 1984
Inventors
Henry Zapletal
Horst F. Wentzek
George M. Chembakaffery
Assignee (at issue)
LEGGETT & PLATT, INC.
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.