Granted Patent
Utility
US 6,815,396 · App. 09/926,453
Adsorbents made of styrene polymers
Inventors:
Yoshiharu Tsujita, Norio Tomotsu
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Nov 6, 2001
Inventors
Yoshiharu Tsujita
Norio Tomotsu
Assignee (at issue)
Idemitsu Petrochemical Co., Ltd.
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.