IP Library › Granted Patent US 4,456,724
Granted Patent Utility
US 4,456,724 · App. 06/364,150

Organic pigments

Inventors: William W. Maslanka, Gavin G. Spence
Patented Case View Patent ↗
Granted: Jun 26, 1984 Filed: Mar 31, 1982
Inventors
William W. Maslanka
Gavin G. Spence
Assignee (at issue)
HERCULES LLC

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 4,456,724
App. No.
06/364,150
Filed
1982-03-31
Granted
1984-06-26
Kind
A