IP Library Granted Patent US 5,342,955
Granted Patent Utility
US 5,342,955 · App. 07/991,676

Diketopyrrolopyrroles

Inventors: Gary Wooden, Guy de Weck, Olof Wallquist
Patented Case View Patent ↗
Granted: Aug 30, 1994 Filed: Dec 16, 1992
Inventors
Gary Wooden
Guy de Weck
Olof Wallquist
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 5,342,955
App. No.
07/991,676
Filed
1992-12-16
Granted
1994-08-30
Kind
A