Granted Patent
Utility
US 6,142,442 · App. 09/036,823
Low wattage, high flow electrical control valve
Inventor:
John B. Carroll
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: Mar 9, 1998
Inventor
John B. Carroll
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.