Granted Patent
Utility
US 4,552,685 · App. 06/124,028
Thickened amphoteric surfactant solutions
Inventors:
John M. Kernstock, Earl H. Johnson, Bertha R. Vaughn
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Feb 25, 1980
Inventors
John M. Kernstock
Earl H. Johnson
Bertha R. Vaughn
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.