Granted Patent
Utility
US 4,874,419 · App. 07/298,319
Substrate for growing shiitake mushrooms
Inventor:
Lung-chi Wu
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Jan 17, 1989
Inventor
Lung-chi Wu
Assignee (at issue)
Campbell Soup 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.