Granted Patent
Utility
US 4,440,914 · App. 06/419,663
Solid epoxy resin systems
Inventors:
David Helfand, Ralph F. Sellers
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: Sep 20, 1982
Inventors
David Helfand
Ralph F. Sellers
Assignee (at issue)
Ciba-Geigy
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.