Granted Patent
Utility
US 4,308,191 · App. 06/123,877
Foundry sand mixes with improved bench life for curing with sulfur dioxide or other oxidizable gaseous catalysts
Inventors:
Robert H. Fox, Roger H. Kottke, James E. Menting, R. Bruce Sampsell
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Feb 25, 1980
Inventors
Robert H. Fox
Roger H. Kottke
James E. Menting
R. Bruce Sampsell
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.