Granted Patent
Utility
US 5,089,540 · App. 07/596,546
Processes and compositions to enhance the tensile strength of reclaimed sand bonded with alkaline resins
Inventors:
David R. Armbruster, S. Raja Iyer, Merlyn C. Pasion
Patented Case
View Patent ↗
Granted: Feb 18, 1992
Filed: Oct 12, 1990
Inventors
David R. Armbruster
S. Raja Iyer
Merlyn C. Pasion
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.