Granted Patent
Utility
US 4,916,313 · App. 07/238,910
Method and apparatus for the determination of isotopic composition
Inventors:
Keith Hall, Philip A. Freedman, Elizabeth J. Jumeau, Roger Guilluy, Christiane Pachiaudi, Jean P. Riou
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Aug 31, 1988
Inventors
Keith Hall
Philip A. Freedman
Elizabeth J. Jumeau
Roger Guilluy
Christiane Pachiaudi
Jean P. Riou
Assignee (at issue)
VG Instruments Group Limited
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.