Granted Patent
Utility
US 6,174,615 · App. 09/301,845
Composite of polysilamine and strong acid
Inventor:
Naoya Ogata
Patented Case
View Patent ↗
Granted: Jan 16, 2001
Filed: Apr 29, 1999
Inventor
Naoya Ogata
Assignee (at issue)
Aventis Research & Technologies GmbH & Co.
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.