Granted Patent
Utility
US 4,620,355 · App. 06/379,289
Method for manufacturing a heat insulating sash bar
Inventors:
Nobushige Doguchi, Yoshitaka Nagai
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: May 18, 1982
Inventors
Nobushige Doguchi
Yoshitaka Nagai
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.