Granted Patent
Utility
US 4,333,283 · App. 06/089,310
Double sash structure
Inventor:
Hiroyuki Ebata
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Oct 30, 1979
Inventor
Hiroyuki Ebata
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.