Granted Patent
Utility
US 4,551,551 · App. 06/424,134
Preparation of bis(aminophenyl) ethers from (N-acetyl)aminophenols or their phenolates
Inventor:
Ervin B. Inskip
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Sep 27, 1982
Inventor
Ervin B. Inskip
Assignee (at issue)
MALLINCKRODT LLC
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.