Granted Patent
Utility
US 5,238,506 · App. 07/877,348
Phosphate coating composition and method of applying a zinc-nickel-manganese phosphate coating
Inventors:
Thomas W. Cape, Harry R. Charles
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Apr 30, 1992
Inventors
Thomas W. Cape
Harry R. Charles
Assignee (at issue)
Chemfil 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.