Granted Patent
Utility
US 5,190,993 · App. 07/538,588
Process to enhance the tensile strength of reclaimed sand bonded with ester cured alkaline phenolic resin using an aminosilane solution
Inventor:
S. Raja Iyer
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Jun 15, 1990
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.