Granted Patent
Utility
US 4,409,889 · App. 06/317,258
Modular clean room
Inventor:
Maurice L. Burleson
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Nov 2, 1981
Inventor
Maurice L. Burleson
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.