Granted Patent
Utility
US 4,991,128 · App. 07/228,279
Apparatus and methods for spectral analysis of electrical materials, components and devices
Inventors:
William Evans, Alan Popplestone
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Aug 4, 1988
Inventors
William Evans
Alan Popplestone
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.