Granted Patent
Utility
US 6,554,603 · App. 09/830,093
Plastifying unit in injection-moulding machines with a nonreturn valve
Inventors:
Helmut Schreiner, Dieter Schimmel, Jorg Seidel, Dieter Streng
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: May 30, 2001
Inventors
Helmut Schreiner
Dieter Schimmel
Jorg Seidel
Dieter Streng
Assignee (at issue)
Demag Ergotech GmbH
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.