Granted Patent
Utility
US 4,658,738 · App. 06/792,102
Apparatus and process for treating soil used for cultivation
Inventor:
Eugen Zinck
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Oct 28, 1985
Inventor
Eugen Zinck
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.