Granted Patent
Utility
US 6,670,309 · App. 09/795,424
Method and apparatus for preparing fluorine-based solvent
Inventors:
Hiroshi Chiba, Keiji Watanabe, Eishin Yamakawa, Takeshi Tokairin
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Feb 28, 2001
Inventors
Hiroshi Chiba
Keiji Watanabe
Eishin Yamakawa
Takeshi Tokairin
Assignee (at issue)
Fujitsu Limited
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.