Granted Patent
Utility
US 6,742,392 · App. 10/283,424
Method and apparatus for inducing ultrasonic waves into railroad rails
Inventors:
Robert S. Gilmore, John Erik Hershey, David Michael Davenport, Daniel White Sexton
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: Oct 29, 2002
Inventors
Robert S. Gilmore
John Erik Hershey
David Michael Davenport
Daniel White Sexton
Assignee (at issue)
General Electric Company
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.