Granted Patent
Utility
US 4,245,435 · App. 06/081,638
High thermal efficiency window
Inventor:
Roger Ulbricht
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Oct 4, 1979
Inventor
Roger Ulbricht
Assignee (at issue)
Flour City Architectural Metals, a division of the Segrave Corporation
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.