Granted Patent
Utility
US 5,176,894 · App. 07/802,855
Process for making improved corrosion preventive zinc cyanamide
Inventor:
John Sinko
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Dec 6, 1991
Inventor
John Sinko
Assignee (at issue)
WAYNE PIGMENT CORPORATION
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.