Granted Patent
Utility
US 6,589,439 · App. 09/874,081
Composition for selective etching of oxides over metals
Inventors:
Kenji Honda, Michelle Elderkin
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Jun 6, 2001
Inventors
Kenji Honda
Michelle Elderkin
Assignee (at issue)
Arch Specialty Chemicals, Inc.
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.