IP Library › Granted Patent US 4,824,948
Granted Patent Utility
US 4,824,948 · App. 07/162,513

Substituted phthalocyanine

Inventors: William M. Stark, Nigel Hughes, Donald M. Gunn
Patented Case View Patent ↗
Granted: Apr 25, 1989 Filed: Mar 1, 1988
Inventors
William M. Stark
Nigel Hughes
Donald M. Gunn
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED

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 4,824,948
App. No.
07/162,513
Filed
1988-03-01
Granted
1989-04-25
Kind
A