Granted Patent
Utility
US 4,971,132 · App. 07/522,657
Alkaline phenolic resole resin binders
Inventors:
David R. Armbruster, Kwok-tuen Tse
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: May 14, 1990
Inventors
David R. Armbruster
Kwok-tuen Tse
Assignee (at issue)
Acme Resin Corp.
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.