Granted Patent
Utility
US 6,115,939 · App. 09/060,688
Process and apparatus for the treatment of flat-form material especially of printed circuit boards
Inventor:
Kaspar Kuster
Patented Case
View Patent ↗
Granted: Sep 12, 2000
Filed: Apr 15, 1998
Inventor
Kaspar Kuster
Assignee (at issue)
Ciba Specialty Chemicals 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.