Granted Patent
Utility
US 4,598,577 · App. 06/639,592
Analysis of materials
Inventors:
Raymond Jowitt, Ian D. Abell
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: Aug 10, 1984
Inventors
Raymond Jowitt
Ian D. Abell
Assignee (at issue)
British Steel 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.