Granted Patent
Utility
US 6,132,483 · App. 09/069,373
Filter for railroad car control valve pipe bracket and access plate
Inventor:
Lawrence J. Andrews
Patented Case
View Patent ↗
Granted: Oct 17, 2000
Filed: Apr 29, 1998
Inventor
Lawrence J. Andrews
Assignee (at issue)
Westinghouse Air Brake Co.
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.