Granted Patent
Utility
US 4,938,438 · App. 07/294,423
Railroad switch stand
Inventors:
Arthur W. Farrell, James A. Remington, Albert V. Fiorenzo, Ray Hoyer
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Jan 9, 1989
Inventors
Arthur W. Farrell
James A. Remington
Albert V. Fiorenzo
Ray Hoyer
Assignee (at issue)
ABC Rail Corporation
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.