Granted Patent
Utility
US 5,654,480 · App. 08/445,244
Recovery and reuse of surfactants from aqueous solutions
Inventors:
Manilal S. Dahanayake, Yun Brian Yang
Patented Case
View Patent ↗
Granted: Aug 5, 1997
Filed: May 19, 1995
Inventors
Manilal S. Dahanayake
Yun Brian Yang
Assignee (at issue)
Rhone-Poulenc Surfactants & Specialties, L.P.
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.