Granted Patent
Utility
US 4,606,830 · App. 06/642,847
Treatment of effluent liquors
Inventors:
Brian A. Cleaver, Alan F. Ivens
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Aug 21, 1984
Inventors
Brian A. Cleaver
Alan F. Ivens
Assignee (at issue)
British Gas
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.