Granted Patent
Utility
US 4,587,098 · App. 06/264,406
Method of stabilized operation of acid digestion kettle of tantalum
Inventors:
Katsuyuki Ohtsuka, Ryukichi Mizuno, Hitoshi Miyazaki, Toshio Fukuzuka, Kazutoshi Shimogori, Hiroshi Satoh, Fumio Kami Kubo
Patented Case
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Granted: May 6, 1986
Filed: May 18, 1981
Inventors
Katsuyuki Ohtsuka
Ryukichi Mizuno
Hitoshi Miyazaki
Toshio Fukuzuka
Kazutoshi Shimogori
Hiroshi Satoh
Fumio Kami Kubo
Assignees (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
Kabushiki Kaisha Kobe Seiko Sho
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.