Granted Patent
Utility
US 4,643,240 · App. 06/783,144
Method of blowing cores etc. using quick-set sand, and improved mold-blowing apparatus
Inventor:
Robert S. Lund
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Oct 30, 1985
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.