Granted Patent
Utility
US 5,149,873 · App. 07/649,401
Process for the purification of mandelic acid N,N-diethylamide
Inventors:
Christer L. Hakansson, Bengt L. Karlsson
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Feb 1, 1991
Inventors
Christer L. Hakansson
Bengt L. Karlsson
Assignee (at issue)
Rexolin Chemicals AB
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.