Granted Patent
Utility
US 5,593,099 · App. 08/167,477
Apparatus for producing solid fertilizer from liquid substances such as manure from liverstock or sludge
Inventor:
Bertwin Langenecker
Patented Case
View Patent ↗
Granted: Jan 14, 1997
Filed: Dec 14, 1993
Inventor
Bertwin Langenecker
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.