Granted Patent
Utility
US 4,917,593 · App. 07/362,067
Injection molding system having valve member split ring
Inventor:
Jobst U. Gellert
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jun 6, 1989
Inventor
Jobst U. Gellert
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.