Granted Patent
Utility
US 4,275,249 · App. 06/099,221
Preparation of 2,4-Di-t-alkylphenol
Inventor:
Bruce E. Firth
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Nov 30, 1979
Inventor
Bruce E. Firth
Assignee (at issue)
UOP 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.