Granted Patent
Utility
US 4,422,020 · App. 06/400,329
Vertical image correction for projection TV
Inventors:
Stanley E. Lehnert, Donald Ankeny
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Jul 21, 1982
Inventors
Stanley E. Lehnert
Donald Ankeny
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.