Granted Patent
Utility
US 6,340,428 · App. 09/424,715
Device and method for determining the concentration of a substrate
Inventors:
Shin Ikeda, Toshihiko Yoshioka, Shiro Nankai
Patented Case
View Patent ↗
Granted: Jan 22, 2002
Filed: Nov 29, 1999
Inventors
Shin Ikeda
Toshihiko Yoshioka
Shiro Nankai
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.