Granted Patent
Utility
US 4,329,154 · App. 06/040,174
Method of recovering boric acid
Inventors:
Kanji Shono, Tokio Kitoh, Hiroshi Sano, Takashi Hironaka
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: May 18, 1979
Inventors
Kanji Shono
Tokio Kitoh
Hiroshi Sano
Takashi Hironaka
Assignee (at issue)
Mitsubishi Chemical Industries, 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.