Granted Patent
Utility
US 4,460,032 · App. 06/342,071
Method and apparatus for blowing cores etc. using a plunger-cleaned blow box suitable for quick-set sand
Inventor:
Robert S. Lund
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Jan 25, 1982
Inventor
Robert S. Lund
Assignee (at issue)
Pettibone, LLC
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.