Granted Patent
Utility
US 5,942,257 · App. 09/013,278
Multi-layer injection molding apparatus having three position valve member
Inventors:
Jobst U. Gellert, Helen Zhuang
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: Jan 26, 1998
Inventors
Jobst U. Gellert
Helen Zhuang
Assignee (at issue)
Mold-Masters 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.