In 1966, Marie Van Brittan Brown lived in Jamaica, Queens, and worked as a nurse. Her hours were irregular — often coming home late — and the neighborhood had unreliable police response and rising break-ins. Her husband, Albert Brown, was an electronics technician. On August 1, 1966, the couple filed US Patent 3,482,037 — "Home Security System Utilizing Television Surveillance." It was granted December 2, 1969. Marie is listed as first inventor.

Read the claims today and you are essentially reading the spec sheet for a Ring doorbell married to a Nest Hub.

The system consisted of:

• Four peepholes drilled into the front door at different heights (to accommodate children, adults, and a person lying on the floor).
• A motorized television camera that could slide vertically on a track behind the door, aligning itself with whichever peephole the resident selected via remote control.
• A radio-frequency link transmitting the video feed to a monitor in the bedroom — wireless, so no wiring had to be pulled through the house.
• A two-way microphone-and-speaker system so the resident could speak with the visitor without opening the door.
• A remote-unlock button that could open the door for a trusted visitor — or, alternately, a panic button wired to alert police or a security firm instantly.

That is: video doorbell, wireless in-home display, intercom, remote unlock, and one-touch emergency response — all specified in a single patent, twenty years before consumer video cameras were even cheap, and roughly forty-five years before Jamie Siminoff filed the first Ring patents.

Why it worked in 1966. Brown used off-the-shelf CCTV cameras (already used in banks since the 1950s), a small VHF transmitter, and a modified door lock solenoid. The genius wasn't any single component — it was the system architecture: motion-selectable camera, wireless monitor at the point of decision (the bedroom), and a binary user action at the end (unlock or call for help). This is the exact interaction pattern every smart-doorbell app implements today: see who's there → talk to them → unlock or dismiss.

The rediscovery. The patent was cited by later home-security filings — including US 4,764,953 (Chern, 1988) and, notably, at least 32 subsequent U.S. patent applications in video surveillance and access control through the 2000s. When Ring launched "DoorBot" in 2013 and Nest Hello followed in 2018, both companies rebuilt Brown's five-element architecture on a Wi-Fi-and-smartphone stack instead of RF-and-CRT. Even the panic-button-to-authorities feature has returned — Ring's controversial partnerships with police departments are, functionally, the 2020s implementation of the same alert loop Brown wired into her bedroom.

What she saw that others didn't. The Browns were solving a specific, personal problem: the moment of decision at the front door, when you can't see who's there and can't safely open it. Every enterprise CCTV system of that era pointed outward, watching a lobby or vault. Brown pointed the camera at the visitor and put the screen where the resident actually was. That inversion — surveillance for the individual homeowner, not the institution — is the entire premise of the $10 billion consumer smart-home security market.

Marie Van Brittan Brown received an award from the National Scientists Committee, gave one recorded interview to The New York Times in 1969, and otherwise lived quietly in Queens until her death in 1999. Her patent is now in every syllabus on Black women inventors — but rarely in the histories of the companies whose products it anticipated.