Granted Patent
Utility
US 6,834,706 · App. 10/357,745
Process for recovering sand and bentonite clay used in a foundry
Inventors:
Robert C. Steele, Allen James Huff
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Feb 4, 2003
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.