Granted Patent
Utility
US 5,337,631 · App. 07/965,283
Method of producing tools and dies
Inventors:
Alfred R. E. Singer, Joseph McGeough, Allen Dennis Roche
Patented Case
View Patent ↗
Granted: Aug 16, 1994
Filed: Mar 31, 1993
Inventors
Alfred R. E. Singer
Joseph McGeough
Allen Dennis Roche
Assignee (at issue)
British Technology Group Limited
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.