Granted Patent
Utility
US 4,641,677 · App. 06/832,728
Coaxial operating rod and packing seal for top-operated, bottom outlet valve in railway tank car and method of aligning same
Inventor:
Robert F. Needham
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Feb 25, 1986
Inventor
Robert F. Needham
Assignee (at issue)
ACF Industries Incorporated
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.