Granted Patent
Utility
US 4,243,802 · App. 06/045,819
Surfactant-soluble cellulose derivatives
Inventor:
Leo M. Landoll
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Jun 6, 1979
Inventor
Leo M. Landoll
Assignee (at issue)
HERCULES LLC
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.