Granted Patent
Utility
US 5,270,471 · App. 07/966,933
Process for making alkylated polyalkylenepolyamines by selective alkylation
Inventors:
John T. Lai, Pyong-Nae Son
Patented Case
View Patent ↗
Granted: Dec 14, 1993
Filed: Oct 27, 1992
Inventors
John T. Lai
Pyong-Nae Son
Assignee (at issue)
B. F. Goodrich Company
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.