Granted Patent
Utility
US 6,729,464 · App. 10/136,014
Mine conveying system
Inventors:
Terry M. Thomas, Thomas A Schwabenbauer, Lynn Wheatcraft
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Apr 30, 2002
Inventors
Terry M. Thomas
Thomas A Schwabenbauer
Lynn Wheatcraft
Assignee (at issue)
Joy MM Delaware, 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.