Granted Patent
Utility
US 4,337,431 · App. 06/019,595
Eddy current test apparatus for annular welds
Inventor:
John C. Hale
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Mar 12, 1979
Inventor
John C. Hale
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.