Granted Patent
Utility
US 4,334,398 · App. 06/092,368
Insulating element for a multi-paned window
Inventor:
Paul Grether
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Nov 8, 1979
Inventor
Paul Grether
Assignee (at issue)
Sulzer Brothers Limited
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.