Granted Patent
Utility
US 5,732,891 · App. 08/730,339
Method and apparatus for producing solid fertilizer from liquid substances such as manure from livestock or sludge
Inventor:
Bertwin Langenecker
Patented Case
View Patent ↗
Granted: Mar 31, 1998
Filed: Oct 15, 1996
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.