Granted Patent
Utility
US 4,289,657 · App. 06/085,754
Fluid treatment devices
Inventor:
Richard S. Nelson
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Oct 17, 1979
Inventor
Richard S. Nelson
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.