Granted Patent
Utility
US 4,358,097 · App. 06/212,818
Spring assembly
Inventors:
Henry Zapletal, Thomas J. Wells
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Dec 4, 1980
Inventors
Henry Zapletal
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.