Granted Patent
Utility
US 5,824,997 · App. 08/691,954
Railroad track switch heater
Inventors:
David L. Reichle, William P. Washington
Patented Case
View Patent ↗
Granted: Oct 20, 1998
Filed: Aug 5, 1996
Inventors
David L. Reichle
William P. Washington
Assignee (at issue)
Fastrax Industries, 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.