Granted Patent
Utility
US 4,653,997 · App. 06/768,681
Injection mold apparatus with gas ejection
Inventors:
James Sheffield, Jacob Van Halteren
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Aug 23, 1985
Inventors
James Sheffield
Jacob Van Halteren
Assignee (at issue)
Izon Industries Inc. Unit #11
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.