Granted Patent
Utility
US 4,295,575 · App. 05/841,945
Surface raceway box
Inventor:
Charles T. Flachbarth
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: Oct 13, 1977
Inventor
Charles T. Flachbarth
Assignee (at issue)
BUTLER MANUFACTURING COMPANY
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.