Granted Patent
Utility
US 5,536,849 · App. 08/283,180
Process for producing gamma-butyrolactone
Inventors:
Manfred Bergfeld, Gunter Wiesgickl
Patented Case
View Patent ↗
Granted: Jul 16, 1996
Filed: Aug 3, 1994
Inventors
Manfred Bergfeld
Gunter Wiesgickl
Assignee (at issue)
AKZO NOBEL N.V.
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.