Granted Patent
Utility
US 4,353,404 · App. 06/230,693
Jointed vertical slat for window blind
Inventor:
Mark D. Trantow
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Feb 2, 1981
Inventor
Mark D. Trantow
Assignee (at issue)
Wausau Metals 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.