Granted Patent
Utility
US 4,487,987 · App. 06/502,881
Method of decolorizing mixtures of aminoethylpiperazine, a polyoxypropylenediamine and alkylphenols with N,N-diethylhydroxylamine
Inventors:
James H. Paslean, Charles S. Steele
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Jun 9, 1983
Inventors
James H. Paslean
Charles S. Steele
Assignee (at issue)
Texaco Inc.
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.