Granted Patent
Utility
US 6,765,707 · App. 10/122,627
Variable slit width device for spectroscope
Inventors:
Eiji Ishikawa, Hiroshi Ando
Patented Case
View Patent ↗
Granted: Jul 20, 2004
Filed: Apr 15, 2002
Inventors
Eiji Ishikawa
Hiroshi Ando
Assignee (at issue)
Ando Electric Co., 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.