Granted Patent
Utility
US 4,857,632 · App. 07/205,813
Residue removal process
Inventors:
David T. Ahlberg, Dilipkumar Padliya, Jeffery T. Reed
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Jun 13, 1988
Inventors
David T. Ahlberg
Dilipkumar Padliya
Jeffery T. Reed
Assignee (at issue)
Polytec GmbH
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.