Granted Patent
Utility
US 4,463,791 · App. 06/502,736
Venetian blind cord lock for up to eight lift cords
Inventor:
David K. McClure
Patented Case
View Patent ↗
Granted: Aug 7, 1984
Filed: Jun 10, 1983
Inventor
David K. McClure
Assignee (at issue)
Marathon Manufacturing Company
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.