Granted Patent
Utility
US 5,480,401 · App. 08/194,276
Extra-discal inter-vertebral prosthesis for controlling the variations of the inter-vertebral distance by means of a double damper
Inventor:
Fernand Navas
Patented Case
View Patent ↗
Granted: Jan 2, 1996
Filed: Feb 10, 1994
Inventor
Fernand Navas
Assignee (at issue)
PSI CO., LTD.
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.