Granted Patent
Utility
US 4,295,639 · App. 06/081,818
Coil spring assembly and forming method
Inventor:
Thomas J. Wells
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: Oct 4, 1979
Inventor
Thomas J. Wells
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.