Granted Patent
Utility
US 4,593,809 · App. 06/611,582
Coil spring assembly machine
Inventors:
Henry Zapletal, Horst F. Wentzek, George M. Chembakaffery
Patented Case
View Patent ↗
Granted: Jun 10, 1986
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.