Granted Patent
Utility
US 6,603,928 · App. 09/987,564
Photometry device
Inventors:
Isamu Hirai, Yoshikazu Iida
Patented Case
View Patent ↗
Granted: Aug 5, 2003
Filed: Nov 15, 2001
Inventors
Isamu Hirai
Yoshikazu Iida
Assignee (at issue)
Pentax Corporation
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.