Granted Patent
Utility
US 4,595,592 · App. 06/676,203
Process for obtaining laxative compounds from senna drugs
Inventor:
Pentti Hietala
Patented Case
View Patent ↗
Granted: Jun 17, 1986
Filed: Nov 28, 1984
Inventor
Pentti Hietala
Assignee (at issue)
Dr. Madaus GmbH & Co
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.