Granted Patent
Utility
US 6,447,593 · App. 09/832,469
Foundry sand with oxidation promoter
Inventors:
Nicholas Edward Sargent, June-Sang Siak, Mei Cai
Patented Case
View Patent ↗
Granted: Sep 10, 2002
Filed: Apr 12, 2001
Inventors
Nicholas Edward Sargent
June-Sang Siak
Mei Cai
Assignee (at issue)
General Motors 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.