Granted Patent
Utility
US 6,529,334 · App. 09/851,386
Eyepiece variable focal length optics
Inventors:
Shinichiro Ishii, Takayuki Ito
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: May 9, 2001
Inventors
Shinichiro Ishii
Takayuki Ito
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.