Granted Patent
Utility
US 5,704,147 · App. 08/784,456
Magnetic letter boards and letters
Inventor:
Michael Rellinger
Patented Case
View Patent ↗
Granted: Jan 6, 1998
Filed: Jan 16, 1997
Inventor
Michael Rellinger
Assignee (at issue)
Quartet Manufacturing Co.
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.