Granted Patent
Utility
US 5,223,638 · App. 07/692,857
Preparation of urethane and carbonate products
Inventors:
William D. McGhee, Barry L. Parnas, Dennis P. Riley, John J. Talley
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Apr 29, 1991
Inventors
William D. McGhee
Barry L. Parnas
Dennis P. Riley
John J. Talley
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.