Granted Patent
Utility
US 4,628,121 · App. 06/780,861
Preparation of acetaldehyde
Inventor:
Nabil Rizkalla
Patented Case
View Patent ↗
Granted: Dec 9, 1986
Filed: Sep 27, 1985
Inventor
Nabil Rizkalla
Assignee (at issue)
The Halcon SD Group, Inc.
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.