Granted Patent
Utility
US 6,535,693 · App. 09/784,239
Photometry device
Inventors:
Isamu Hirai, Yoshikazu Iida
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Feb 16, 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.