Granted Patent
Utility
US 6,554,049 · App. 09/858,060
Process for recovering sand and bentonite clay used in a foundry
Inventors:
Robert C. Steele, Allen James Huff
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: May 15, 2001
Inventors
Robert C. Steele
Allen James Huff
Assignee (at issue)
Foundry Advanced Clay Technologies, L.L.C.
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.