Granted Patent
Utility
US 6,326,522 · App. 09/592,403
Process for production of 1,3-di(2-p-hydroxyphenyl-2-propyl)benzene
Inventors:
Toru Nakaguchi, Takafumi Tsujigami, Kenji Ekawa, Kenzo Tsujimoto, Kiyoshi Kumaki
Patented Case
View Patent ↗
Granted: Dec 4, 2001
Filed: Jun 13, 2000
Inventors
Toru Nakaguchi
Takafumi Tsujigami
Kenji Ekawa
Kenzo Tsujimoto
Kiyoshi Kumaki
Assignee (at issue)
HONSHU CHEMICAL INDUSTRY 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.