IP Library › Granted Patent US 4,994,628
Granted Patent Utility
US 4,994,628 · App. 07/411,631

Phenolic antioxidant process

Inventors: Lloyd E. Goddard, George L. Mina
Patented Case View Patent ↗
Granted: Feb 19, 1991 Filed: Sep 25, 1989
Inventors
Lloyd E. Goddard
George L. Mina
Assignee (at issue)
Ethyl Corporation

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,994,628
App. No.
07/411,631
Filed
1989-09-25
Granted
1991-02-19
Kind
A