Granted Patent
Utility
US 4,035,290 · App. 05/612,298
Method for the treatment of wastewater
Inventor:
Wilbur N. Torpey
Patented Case
View Patent ↗
Granted: Jul 12, 1977
Filed: Sep 11, 1975
Inventor
Wilbur N. Torpey
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.