She filed a further development of her information-signal generation work.
On November 26, 1969, Evelyn Berezin filed U.S. patent application US 3,651,311, titled "Information signal generation apparatus." This filing further developed her earlier 1966 work on signal generation technology, refining methods for producing and managing electronic information signals within computing systems.
By late 1969, Berezin had co-founded Redactron Corporation, the company she and three colleagues established to develop and sell computerized word processors based on her emerging Data Secretary concept. This patent filing, occurring in the same year as Redactron's founding, illustrates the technical continuity between her earlier systems work and her pivot toward word processing technology.
This patent is historically significant as one of the last in her long series focused on information signal and transfer technology before her career's culminating achievement: the 1971 commercial delivery of the Data Secretary, one of the first computerized standalone word processors. The signal-generation expertise reflected in this patent would have been directly applicable to the internal electronics of the Data Secretary, which needed to reliably generate, store, and manipulate text-based information signals to allow users to edit and revise documents electronically for the first time in office history.