Granted Patent
Utility
US 6,727,993 · App. 09/147,520
Surface inspection instrument and surface inspection method
Inventor:
Ryuzou Tomomatsu
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Feb 22, 1999
Inventor
Ryuzou Tomomatsu
Assignee (at issue)
Idemitsu Petrochemical 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.