Granted Patent
Utility
US 5,022,613 · App. 07/514,980
AC and battery backup supply for a railroad crossing gate
Inventor:
Richard V. Peel
Patented Case
View Patent ↗
Granted: Jun 11, 1991
Filed: Apr 26, 1990
Inventor
Richard V. Peel
Assignee (at issue)
Safetran Systems 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.