How Douglas Engelbart Invented the Computer Mouse
The 1970 patent for the X-Y position indicator, better known as the computer mouse, which allowed users to move a cursor across a screen for the first time.
Original patent title: “X-y position indicator for a display system”
The 1970 patent for the X-Y position indicator, better known as the computer mouse, which allowed users to move a cursor across a screen for the first time. Granted to Stanford Research Institute in 1970 with 162 forward citations, and it is now in the public domain.
Coverage
What does this patent actually cover?
The patent describes a device with two wheels positioned at a 90-degree angle to each other. As the user moves the device across a flat surface, the wheels rotate independently to track movement in the X and Y axes. This mechanical data is transmitted to a computer to move a cursor on a display screen. It replaced the need for complex keyboard commands to navigate graphical interfaces.
The gap
What does this patent NOT cover?
- Does not cover optical sensors, as this patent relies on physical wheels for tracking.
- Does not cover wireless connectivity, as the original design required a physical cord.
- Does not cover multi-button configurations, as the original patent focused on a single-button design.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
Key facts
What made this novel
By using two perpendicular wheels, Engelbart translated physical hand movement into precise coordinate data, solving the problem of how to intuitively point at digital objects.
The Patent Drawing
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
The original wooden prototype demonstrated at the 1968 Mother of All Demos
Early Xerox Alto workstations
Apple Lisa and Macintosh mouse peripherals
Why it matters
The bigger picture
This invention is the foundation of modern human-computer interaction. It enabled the shift from text-based command prompts to the graphical user interfaces that define how we use computers today.
Filed
June 21, 1967
Granted
November 17, 1970
Market context
Who's building on this
Companies in this space
Companies like Logitech and Razer have built entire businesses refining the form factor and sensor technology originating from this mechanical concept. While the original patent has long expired, the fundamental principle of relative motion tracking remains a core input method.
Market impact
This patent enabled the creation of the graphical user interface (GUI) industry. It shifted computing from a niche activity for specialists to an accessible tool for the general public by making navigation intuitive.
Claim 1 — Plain English
What this patent covers
The patent describes a device with two wheels positioned at a 90-degree angle to each other. As the user moves the device across a flat surface, the wheels rotate independently to track movement in the X and Y axes. This mechanical data is transmitted to a computer to move a cursor on a display screen. It replaced the need for complex keyboard commands to navigate graphical interfaces.
The clever bit
By using two perpendicular wheels, Engelbart translated physical hand movement into precise coordinate data, solving the problem of how to intuitively point at digital objects.
What it does not cover
- Does not cover optical sensors, as this patent relies on physical wheels for tracking.
- Does not cover wireless connectivity, as the original design required a physical cord.
- Does not cover multi-button configurations, as the original patent focused on a single-button design.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
Patent enters public domain
This patent is in the public domain
See the Freedom to Build guide — what is free to use, what is not, and how to cite this patent.
PatentBrief Score
Impact Score
Strong
Citation count
40/40
Highly cited
Claim breadth
0/20
Narrow claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
0/20
Older than 20 years
Assignee scale
20/20
Major company or institution
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$48K – $154K
Midpoint $96K · expired or expiring · industry ×1.6
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Claim text not yet imported for this patent
Concepts involved
Citations
Patent lineage
Cite this patent
Engelbart, D. C. (1970). How Douglas Engelbart Invented the Computer Mouse (U.S. Patent No. 3,541,541). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/3541541/computer-mouse-input-device
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How Douglas Engelbart Invented the Computer Mouse cover?
The 1970 patent for the X-Y position indicator, better known as the computer mouse, which allowed users to move a cursor across a screen for the first time.
Who owns patent US 3541541?
Stanford Research Institute owns this patent, granted in 1970.
When does this patent expire?
This patent has expired and is now in the public domain — anyone can use the invention freely.
What is patent US 3541541 cited by?
This patent has been cited by 162 later patents that build on its ideas.
What problem does this patent solve?
This invention is the foundation of modern human-computer interaction. It enabled the shift from text-based command prompts to the graphical user interfaces that define how we use computers today.
What does this patent NOT cover?
Does not cover optical sensors, as this patent relies on physical wheels for tracking.
Patent monitoring