Granted Patent
Utility
US 4,490,559 · App. 06/593,961
Process for making aldehydes from diesters of carbonic acid
Inventors:
Richard W. Wegman, John B. Letts
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Mar 27, 1984
Inventors
Richard W. Wegman
John B. Letts
Assignee (at issue)
SHELL OIL 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.