Granted Patent
Utility
US 3,932,273 · App. 05/523,701
Method for the primary and secondary treatment of wastewater in a unitary apparatus
Inventors:
Wilbur N. Torpey, Richard A. Sullivan
Patented Case
View Patent ↗
Granted: Jan 13, 1976
Filed: Nov 14, 1974
Inventors
Wilbur N. Torpey
Richard A. Sullivan
Assignee (at issue)
AUTO-TROL 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.