Granted Patent
Utility
US 4,767,503 · App. 06/527,044
Removal of light impurities from caprolactam by distillation with water
Inventors:
Lamberto Crescentini, Joseph D. DeCaprio, William B. Fisher, Roy J. Lilley, Jr.
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Aug 29, 1983
Inventors
Lamberto Crescentini
Joseph D. DeCaprio
William B. Fisher
Roy J. Lilley, Jr.
Assignee (at issue)
ALLIED CONSULTING, 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.