Granted Patent
Utility
US 6,231,961 · App. 09/207,706
Layered structures comprising particles, a dry binder and a foamable substance
Inventor:
Henry Sperber
Patented Case
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Granted: May 15, 2001
Filed: Dec 9, 1998
Inventor
Henry Sperber
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.