Granted Patent
Utility
US 6,516,969 · App. 09/926,337
Chemical feeding device
Inventor:
Yuichi Tamaoki
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Jan 15, 2002
Inventor
Yuichi Tamaoki
Assignee (at issue)
SANYO ELECTRIC 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.