Granted Patent
Utility
US 4,427,459 · App. 06/342,279
Phosphate conversion coatings for metals with reduced coating weights and crystal sizes
Inventor:
Kurt Goltz
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Jan 25, 1982
Inventor
Kurt Goltz
Assignee (at issue)
Pennwalt 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.