Granted Patent
Utility
US 4,403,446 · App. 06/282,946
Hydroponic growing medium and method
Inventors:
Richard E. Wolfe, Marvin G. Fiechtner
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Jul 13, 1981
Inventors
Richard E. Wolfe
Marvin G. Fiechtner
Assignee (at issue)
The Stearns & Foster Company
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.