Granted Patent
Utility
US 6,299,736 · App. 09/333,587
Process for recovering .gamma.-butyrolactone from a mixture of heavy organics
Inventors:
Kenneth A. Windhorst, H. Robert Gerberich, Deborah A. Sitz, Nicole Garrett-Wallace, R. Jay Warner
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Jun 15, 1999
Inventors
Kenneth A. Windhorst
H. Robert Gerberich
Deborah A. Sitz
Nicole Garrett-Wallace
R. Jay Warner
Assignee (at issue)
Celanese International Corporation
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.