IP Library › Granted Patent US 4,942,238
Granted Patent Utility
US 4,942,238 · App. 07/355,218

Unsaturated derivatives of 2,2,6,6-tetramethylpiperidine

Inventors: Gerhard Rytz, Mario Slongo
Patented Case View Patent ↗
Granted: Jul 17, 1990 Filed: May 22, 1989
Inventors
Gerhard Rytz
Mario Slongo
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 4,942,238
App. No.
07/355,218
Filed
1989-05-22
Granted
1990-07-17
Kind
A