Granted Patent
Utility
US 4,339,265 · App. 06/125,115
Sewage treatment method and apparatus
Inventor:
John A. Engelmann
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Feb 27, 1980
Inventor
John A. Engelmann
Assignee (at issue)
Veda Incorporated
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.