Granted Patent
Utility
US 6,168,721 · App. 09/466,443
Process for the treatment of arsenic-containing sludge
Inventors:
Satoru Sugita, Taku Shimizu, Koichiro Iwashita, Hiroshi Baba, Hideki Kamiyoshi, Morikata Nishida
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Dec 17, 1999
Inventors
Satoru Sugita
Taku Shimizu
Koichiro Iwashita
Hiroshi Baba
Hideki Kamiyoshi
Morikata Nishida
Assignee (at issue)
MITSUBISHI ELECTRIC 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.