Granted Patent
Utility
US 5,728,235 · App. 08/747,136
Moderate temperature manganese phosphate conversion coating composition and process
Inventors:
Mervet S. Boulos, David C. Montrose, Michael Petschel
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Nov 12, 1996
Inventors
Mervet S. Boulos
David C. Montrose
Michael Petschel
Assignee (at issue)
Henkel Limited
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.