Granted Patent
Utility
US 4,708,790 · App. 06/892,896
Ultrafiltration system with regeneration control
Inventor:
James William Bray
Patented Case
View Patent ↗
Granted: Nov 24, 1987
Filed: Aug 1, 1986
Inventor
James William Bray
Assignee (at issue)
Champion International Corporation Limited
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.