Granted Patent
Utility
US 4,235,403 · App. 06/032,046
Speed control apparatus and method for railroad car retarders
Inventors:
Harold C. Gillen, Donald R. Little
Patented Case
View Patent ↗
Granted: Nov 25, 1980
Filed: Apr 23, 1979
Inventors
Harold C. Gillen
Donald R. Little
Assignee (at issue)
American Standard 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.