Granted Patent
Utility
US 5,952,290 · App. 08/979,296
Anionic gemini surfactants and methods for their preparation
Inventors:
Ruoxin Li, David J. Tracy
Patented Case
View Patent ↗
Granted: Sep 14, 1999
Filed: Nov 26, 1997
Inventors
Ruoxin Li
David J. Tracy
Assignee (at issue)
Rhodia, 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.