Granted Patent
Utility
US 6,638,618 · App. 10/012,248
Black composite iron oxide pigment, and paint and resin composition using the same
Inventors:
Kazuyuki Hayashi, Yusuke Shimohata, Mineko Ohsugi, Hiroko Morii
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Dec 11, 2001
Inventors
Kazuyuki Hayashi
Yusuke Shimohata
Mineko Ohsugi
Hiroko Morii
Assignee (at issue)
TODA KOGYO CORP.
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.