Granted Patent
Utility
US 5,238,976 · App. 07/953,121
Process to enhance the tensile strength of reclaimed sand bonded with ester cured alkaline phenolic resin
Inventor:
S. Raja Iyer
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Nov 12, 1992
Inventor
S. Raja Iyer
Assignee (at issue)
Borden Inc.
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.