Granted Patent
Utility
US 4,657,231 · App. 06/848,407
Furniture spring assembly having frame support
Inventor:
Zygmunt M. Surletta
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Apr 4, 1986
Inventor
Zygmunt M. Surletta
Assignee (at issue)
Lear Siegler, 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.