Granted Patent
Utility
US 5,919,980 · App. 08/812,901
Recovery and reuse of amphoteric surfactants from aqueous solutions
Inventors:
Manilal S. Dahanayake, Yun Brian Yang, Mark Ventura
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Mar 10, 1997
Inventors
Manilal S. Dahanayake
Yun Brian Yang
Mark Ventura
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.