Granted Patent
Utility
US 6,669,730 · App. 09/970,479
Intervertebral spacer device utilizing a spirally slotted belleville washer having radially extending grooves
Inventors:
James D. Ralph, Stephen Tatar
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Oct 4, 2001
Inventors
James D. Ralph
Stephen Tatar
Assignee (at issue)
SpineCore, 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.