IP Library › Granted Patent US 4,233,209
Granted Patent Utility
US 4,233,209 · App. 05/960,979

Hindered phenol hydrazones and compositions stabilized therewith

Inventors: Martin Dexter, David H. Steinberg
Patented Case View Patent ↗
Granted: Nov 11, 1980 Filed: Nov 15, 1978
Inventors
Martin Dexter
David H. Steinberg
Assignee (at issue)
Ciba-Geigy

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 4,233,209
App. No.
05/960,979
Filed
1978-11-15
Granted
1980-11-11
Kind
A