Granted Patent
Utility
US 4,846,975 · App. 07/118,365
Anaerobic digestion process
Inventor:
John Kelyman
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Nov 6, 1987
Inventor
John Kelyman
Assignee (at issue)
Beloit Corporation
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.