IP Library › Granted Patent US 5,149,849
Granted Patent Utility
US 5,149,849 · App. 07/670,661

Process for the preparation of quinhydrones

Inventors: Michael Bellas, Yeong-Jen Kuo, Fred H. Rash
Patented Case View Patent ↗
Granted: Sep 22, 1992 Filed: Mar 18, 1991
Inventors
Michael Bellas
Yeong-Jen Kuo
Fred H. Rash

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 5,149,849
App. No.
07/670,661
Filed
1991-03-18
Granted
1992-09-22
Kind
A