Granted Patent
Utility
US 4,570,290 · App. 06/682,565
Hinge having a laterally outwardly extending flat spring
Inventor:
John P. Anderson
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Dec 14, 1984
Inventor
John P. Anderson
Assignee (at issue)
Hartwell Corporation
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.