Granted Patent
Utility
US 5,419,201 · App. 08/022,560
Methods and devices for electrochemically determining metal fatigue status
Inventors:
Yuanfeng Li, Campbell Laird
Patented Case
View Patent ↗
Granted: May 30, 1995
Filed: Feb 25, 1993
Inventors
Yuanfeng Li
Campbell Laird
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.