Granted Patent
Utility
US 5,648,104 · App. 08/434,324
Extrusion die
Inventor:
Hobab El-Sobky
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: May 2, 1995
Inventor
Hobab El-Sobky
Assignee (at issue)
University of Manchester Institute of Science and Technology
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.