Granted Patent
Utility
US 4,759,221 · App. 07/027,484
Apparatus for the determination of surface cracks
Inventors:
Erhard Ortlieb, Peter Wahode
Patented Case
View Patent ↗
Granted: Jul 26, 1988
Filed: Mar 17, 1987
Inventors
Erhard Ortlieb
Peter Wahode
Assignee (at issue)
Kraftwerk Union Aktiengesellschaft
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.