Granted Patent
Utility
US 5,656,586 · App. 08/292,993
Amphoteric surfactants having multiple hydrophobic and hydrophilic groups
Inventors:
Ji Li, Manilal S. Dahanayake, Robert Lee Reierson, David J. Tracy
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Aug 19, 1994
Inventors
Ji Li
Manilal S. Dahanayake
Robert Lee Reierson
David J. Tracy
Assignee (at issue)
Rhone-Poulenc, 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.