Granted Patent
Utility
US 4,820,385 · App. 07/156,874
Purification of alkyl glyoxylate in a continuous column by azeotropic distillation
Inventors:
Dario R. Cova, John M. Thorman
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Feb 18, 1988
Inventors
Dario R. Cova
John M. Thorman
Assignee (at issue)
Monsanto 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.