Granted Patent
Utility
US 6,823,800 · App. 10/405,664
Spring seat for a railway truck sideframe and method of making the same
Inventors:
Thomas R. Berg, Anthony J. Bauer, Thomas R. Callahan, Hector Chaidez, Ralph H. Schorr
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Apr 2, 2003
Inventors
Thomas R. Berg
Anthony J. Bauer
Thomas R. Callahan
Hector Chaidez
Ralph H. Schorr
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.