IP Library › Granted Patent US 4,758,347
Granted Patent Utility
US 4,758,347 · App. 07/008,817

Process for purifying dyeing wastewaters

Inventors: Alfred Henz, Heinz Pfenninger
Patented Case View Patent ↗
Granted: Jul 19, 1988 Filed: Jan 30, 1987
Inventors
Alfred Henz
Heinz Pfenninger
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 4,758,347
App. No.
07/008,817
Filed
1987-01-30
Granted
1988-07-19
Kind
A