Granted Patent
Utility
US 4,866,270 · App. 07/238,898
Method and apparatus for the determination of isotopic composition
Inventors:
Keith Hall, Philip A. Freedman, Elizabeth J. Jumeau, Roger Guilluy, Christiane Pachiaudi
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Aug 31, 1988
Inventors
Keith Hall
Philip A. Freedman
Elizabeth J. Jumeau
Roger Guilluy
Christiane Pachiaudi
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.