Granted Patent
Utility
US 6,403,828 · App. 09/462,888
Method of refining crystalline material
Inventors:
Hiroyuki Kuwahara, Kazuyoshi Horibe, Nobumasa Noma, Masakazu Takeuchi, Yukio Akimaru
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Jan 18, 2000
Inventors
Hiroyuki Kuwahara
Kazuyoshi Horibe
Nobumasa Noma
Masakazu Takeuchi
Yukio Akimaru
Assignee (at issue)
NIPPON STEEL CHEMICAL 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.