Granted Patent
Utility
US 5,334,834 · App. 08/045,422
Inductively coupled plasma mass spectrometry device
Inventors:
Tetsumasa Ito, Yoshitomo Nakagawa
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Apr 13, 1993
Inventors
Tetsumasa Ito
Yoshitomo Nakagawa
Assignee (at issue)
SEIKO INSTRUMENTS 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.