Granted Patent
Utility
US 4,472,246 · App. 06/409,905
Process for recovery of amine from spent acid stripping liquor
Inventors:
David M. Stamerjohn, Richard V. Norton, Gregory P. Sturtz
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Aug 20, 1982
Inventors
David M. Stamerjohn
Richard V. Norton
Gregory P. Sturtz
Assignee (at issue)
Ashland Oil, 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.