Granted Patent
Utility
US 6,265,203 · App. 09/106,174
Microorganism culture material containing a water-soluble polymer layer and a porous matrix layer
Inventor:
Masashi Ushiyama
Patented Case
View Patent ↗
Granted: Jul 24, 2001
Filed: Jun 29, 1998
Inventor
Masashi Ushiyama
Assignee (at issue)
Chisso Corporation
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.