Granted Patent
Utility
US 4,228,461 · App. 06/042,697
Vertical synchronization system
Inventor:
William R. Weissmueller
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: May 25, 1979
Inventor
William R. Weissmueller
Assignee (at issue)
Zenith Radio 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.