Granted Patent
Utility
US 4,256,871 · App. 06/031,113
Synthetic polymer emulsifier from condensation of naphthalene sulfonic acid, alkyl benzene sulfonic acid and formaldehyde
Inventors:
John G. Papalos, Ronald W. Kavchok
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Apr 18, 1979
Inventors
John G. Papalos
Ronald W. Kavchok
Assignee (at issue)
Diamond Shamrock Corporation
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.