Granted Patent
Utility
US 6,656,387 · App. 09/949,779
Ammonia injection for minimizing waste water treatment
Inventor:
Chih-Hao M. Tsang
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Sep 10, 2001
Inventor
Chih-Hao M. Tsang
Assignee (at issue)
Texaco Inc.
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.