On the same day, she filed a companion patent further developing her data-transfer technology.
Also on July 7, 1961, Evelyn Berezin filed U.S. patent application US 3,259,886, titled "Data transfer apparatus." Filed alongside her on-line data transfer apparatus patent, this invention further refined mechanisms for moving data reliably between computing components.
The dual filing on this date underscores how comprehensively Berezin was addressing the technical problem of data transfer from multiple engineering angles simultaneously—covering both the broader system-level 'on-line' concept and the more granular apparatus-level implementation. This kind of layered patent strategy was characteristic of serious industrial R&D efforts in computing during this period.
Historically, this patent reinforces Berezin's role as a systems-level thinker who understood that reliable data transfer was the backbone of any advanced computing application. Her sustained focus on this technology through multiple patents in 1961 reflects the depth of her expertise, expertise she would soon apply to real-world large-scale systems, including the United Airlines computerized reservation system, one of the first of its kind, which required exactly this sort of robust, fault-tolerant data transfer capability between distributed terminals and central data stores.