Granted Patent
Utility
US 4,887,920 · App. 07/141,030
Punctuation check feature for an electronic typewriter
Inventors:
Doris J. McRae, Richard Roberts
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Jan 5, 1988
Inventors
Doris J. McRae
Richard Roberts
Assignee (at issue)
Smith Corona Corp.
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.