Granted Patent
Utility
US 4,270,322 · App. 06/025,265
Double-glazed window structure
Inventor:
Kinji Ishida
Patented Case
View Patent ↗
Granted: Jun 2, 1981
Filed: Mar 29, 1979
Inventor
Kinji Ishida
Assignee (at issue)
Yoshida Kogyo 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.