Granted Patent
Utility
US 6,440,586 · App. 09/533,240
Benzopyran compound, material for luminous device, and luminous device using the same
Inventors:
Terukazu Yanagi, Hisashi Okada, Tatsuya Igarashi
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Mar 22, 2000
Inventors
Terukazu Yanagi
Hisashi Okada
Tatsuya Igarashi
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.