Granted Patent
Utility
US 6,557,431 · App. 09/773,821
Fail-safe ball screw
Inventor:
John Thomas Pawlak
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 2, 2001
Inventor
John Thomas Pawlak
Assignee (at issue)
Siemens Medical Solutions USA, 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.