Granted Patent
Utility
US 4,169,945 · App. 05/867,269
Process for production of polygalactomannan ethers
Inventors:
Andrea DeGuia, Robert W. Stackman, Anthony B. Conciatori
Patented Case
View Patent ↗
Granted: Oct 2, 1979
Filed: Jan 5, 1978
Inventors
Andrea DeGuia
Robert W. Stackman
Anthony B. Conciatori
Assignee (at issue)
Celanese GmbH
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.