Granted Patent
Utility
US 6,557,477 · App. 10/162,153
Ring protector for preventing tampering of valves positioned inside a railcar dome
Inventors:
Alex V. Degutis, Andrew Crouse
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Jun 4, 2002
Inventors
Alex V. Degutis
Andrew Crouse
Assignee (at issue)
Salco Products, 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.