IP Library › Granted Patent US 4,620,047
Granted Patent Utility
US 4,620,047 · App. 06/661,860

Process for the separation of ortho-nitrotoluene

Inventor: Hermann A. Zinnen
Patented Case View Patent ↗
Granted: Oct 28, 1986 Filed: Oct 18, 1984
Inventor
Hermann A. Zinnen
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.

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 4,620,047
App. No.
06/661,860
Filed
1984-10-18
Granted
1986-10-28
Kind
A