IP Library › Granted Patent US 6,809,187
Granted Patent Utility
US 6,809,187 · App. 10/399,012

Metal complex dyes based on Bucherer naphthols

Inventors: Stefan Ehrenberg, Klaus Kunde
Patented Case View Patent ↗
Granted: Oct 26, 2004 Filed: Apr 10, 2003
Inventors
Stefan Ehrenberg
Klaus Kunde
Assignee (at issue)
Oystar Textil Farben GmbH & Co.

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 6,809,187
App. No.
10/399,012
Filed
2003-04-10
Granted
2004-10-26
Kind
B2