Granted Patent
Utility
US 4,381,813 · App. 06/300,937
Method for manufacturing foundry cores
Inventor:
Roger H. Kottke
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Sep 10, 1981
Inventor
Roger H. Kottke
Assignee (at issue)
The Quaker Oats Company
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.