Granted Patent
Utility
US 6,705,874 · App. 09/685,505
Colored magnetic particles for magnetophoretic display and method for manufacturing same
Inventor:
Akihiro Koyama
Patented Case
View Patent ↗
Granted: Mar 16, 2004
Filed: Oct 10, 2000
Inventor
Akihiro Koyama
Assignees (at issue)
Marktec Inc.
Takara 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.