Granted Patent
Utility
US 5,443,700 · App. 08/283,175
Method for treating waste water containing oil composed of esters, and treating apparatus thereof
Inventors:
Yasuo Hirose, Kikuo Okada
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Aug 3, 1994
Inventors
Yasuo Hirose
Kikuo Okada
Assignee (at issue)
HITACHI, LTD.
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.