Granted Patent
Utility
US 4,332,720 · App. 05/847,642
N,N'-Polyoxyalkylene bis(lactam carboxylic acids)
Inventors:
Heinz Schulze, Robert L. Zimmerman, Harold G. Waddill
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Nov 1, 1977
Inventors
Heinz Schulze
Robert L. Zimmerman
Harold G. Waddill
Assignee (at issue)
Texaco Development 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.