Granted Patent
Utility
US 4,226,971 · App. 06/005,125
Phenol-aldehyde condensation product with aminoalkylene derivative of a polyoxyalkylenepolyamine
Inventors:
Harold G. Waddill, Howard P. Klein
Patented Case
View Patent ↗
Granted: Oct 7, 1980
Filed: Jan 22, 1979
Inventors
Harold G. Waddill
Howard P. Klein
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.