Granted Patent
Utility
US 5,232,712 · App. 07/722,851
Extrusion apparatus and systems
Inventors:
John Mills, Nicholas F. Warner
Patented Case
View Patent ↗
Granted: Aug 3, 1993
Filed: Jun 28, 1991
Inventors
John Mills
Nicholas F. Warner
Assignee (at issue)
Brown University Research Foundation
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.