Granted Patent
Utility
US 5,328,554 · App. 07/980,656
Fabrication process for narrow groove
Inventor:
Simon G. Ingram
Patented Case
View Patent ↗
Granted: Jul 12, 1994
Filed: Nov 24, 1992
Inventor
Simon G. Ingram
Assignee (at issue)
GEC-Marconi Ltd.
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.