Granted Patent
Utility
US 6,540,013 · App. 09/876,613
Method of increasing the strength and solids level of investment casting shells
Inventor:
Ronald S. Doles
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Jun 7, 2001
Inventor
Ronald S. Doles
Assignee (at issue)
Ondeo Nalco 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.