Granted Patent
Utility
US 5,000,819 · App. 07/442,797
Metal surface cleaning processes
Inventors:
David J. Pedder, Christopher John Howard Wort, Kim Louise Pickering
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Nov 29, 1989
Inventors
David J. Pedder
Christopher John Howard Wort
Kim Louise Pickering
Assignee (at issue)
Plessey Overseas 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.