Granted Patent
Utility
US 6,136,872 · App. 09/442,159
Freeze-dried polystyrene-polysiloxane foams
Inventor:
Ronald J. Hoxmeier
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Nov 16, 1999
Inventor
Ronald J. Hoxmeier
Assignee (at issue)
SHELL OIL COMPANY
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.