Granted Patent
Utility
US 4,987,582 · App. 07/423,831
X-ray fluorescence imaging of elements
Inventors:
Jackie R. Webster, Keith Pearson, David B. Chang, Norton L. Moise, Victor Vali
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Oct 19, 1989
Inventors
Jackie R. Webster
Keith Pearson
David B. Chang
Norton L. Moise
Victor Vali
Assignee (at issue)
Hughes Aircraft Company
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.