The Computer Mouse — Invented 30 Years Before Anyone Cared

Douglas Engelbart's 1970 mouse patent at SRI describes the x-y position indicator he demonstrated in the 'Mother of All Demos' in 1968 — a pointing device that would sit unused in patents for 15 years before Apple made it mainstream.

What it covers

This patent describes a device that moves across a surface and translates that physical movement into x-y coordinate changes on a display screen. The original device had two perpendicular wheels that rolled on a desktop surface — as the device moved, one wheel tracked horizontal movement and the other tracked vertical movement, and the position of a cursor on the screen updated accordingly. A button on the device allowed the user to signal selections or commands. The entire assembly was connected to the computer by a cable — which Engelbart's team thought looked like a tail, which is why they called it a mouse.

What it doesn't cover

• —Optical mice — the original design used mechanical wheels, not optical sensors tracking surface texture
• —Wireless mice — all connections in this design are wired
• —Multi-touch trackpads — the patent covers a discrete pointing device, not multi-finger gesture surfaces
• —Touchscreens — direct-touch interfaces without a cursor are a separate paradigm

The clever bit

Engelbart invented the mouse at SRI (Stanford Research Institute) in the 1960s as part of his larger vision of 'augmenting human intellect' — using computers to help people think more effectively. The mouse was just one piece of a complete system he demonstrated on December 9, 1968, in what became known as the Mother of All Demos. In 90 minutes, Engelbart showed a live audience: a word processor, hypertext links, video conferencing, collaborative real-time editing, and the mouse. Every single thing he demonstrated exists in some form on your computer today. Yet his demo was largely ignored by the computing establishment of 1968 — computers were for batch processing, not interactive work. It took another 15 years for Apple to put a mouse on the Macintosh and make the idea mainstream.

Why it matters

Engelbart received a one-time payment of approximately $10,000 when SRI licensed the mouse to Apple. He received no royalties. The patent had expired by the time the mouse went mainstream. Engelbart spent his later career largely frustrated that the computing world had taken the mouse (a small part of his vision) and ignored everything else — the collaborative, networked, knowledge-augmentation system he had actually been building. He died in 2013, widely credited as a visionary but far less wealthy or famous than the people who commercialized his ideas.

Real-world examples

• 1.Xerox PARC licensed the mouse concept from SRI and built the Alto (1973) and Star (1981) computers around it — Steve Jobs famously visited PARC in 1979 and licensed the technology for the Macintosh
• 2.Apple's Lisa (1983) and Macintosh (1984) were the first mass-market computers with a mouse — they sold it for $25 separately, which Steve Jobs thought was too cheap
• 3.Logitech was founded in 1981 specifically to manufacture mice — and became the dominant peripheral company of the PC era

Glossary