Granted Patent
Utility
US 4,316,653 · App. 06/019,600
Condenser optical system for a microscope
Inventor:
Yoshiyuki Shimizu
Patented Case
View Patent ↗
Granted: Feb 23, 1982
Filed: Mar 12, 1979
Inventor
Yoshiyuki Shimizu
Assignee (at issue)
Nippon Kogaku K.K.
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.