Granted Patent
Utility
US 4,176,138 · App. 05/955,442
Process for preparing p-aminophenol in the presence of dimethyldodecylamine sulfate
Inventor:
Sharad S. Sathe
Patented Case
View Patent ↗
Granted: Nov 27, 1979
Filed: Oct 27, 1978
Inventor
Sharad S. Sathe
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.