Granted Patent
Utility
US 4,330,345 · App. 06/214,537
Phosphate coating process and composition
Inventors:
Donald L. Miles, Harry R. Charles
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Dec 8, 1980
Inventors
Donald L. Miles
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.