Granted Patent
Utility
US 6,814,317 · App. 10/182,124
Constant volume delivery device and method of delivering powder material
Inventors:
Yasushi Watanabe, Yuji Iwase, Kiyoshi Morimoto
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Dec 11, 2002
Inventors
Yasushi Watanabe
Yuji Iwase
Kiyoshi Morimoto
Assignee (at issue)
KYOWA HAKKO KOGYO 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.