Granted Patent
Utility
US 4,522,320 · App. 06/604,400
Kiln floor system
Inventor:
Norman H. Andreasen
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Apr 27, 1984
Inventor
Norman H. Andreasen
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.