How the Wright Brothers Invented Modern Airplane Control
The foundational patent for the first successful powered, heavier-than-air flying machine that could be controlled in flight.
Original patent title: “Flying-machine.”
The foundational patent for the first successful powered, heavier-than-air flying machine that could be controlled in flight. Granted to Individual in 1906 with 19 forward citations, and it is now in the public domain.
Coverage
What does this patent actually cover?
The patent describes a system for controlling a flying machine by warping the wings to maintain balance and steer. It utilizes a mechanism to twist the wing tips in opposite directions, creating a difference in lift that causes the aircraft to bank. This lateral control, combined with a vertical rudder, allowed the pilot to maintain stability against wind gusts and execute coordinated turns.
The gap
What does this patent NOT cover?
- Does not cover jet propulsion or turbine engines.
- Does not cover vertical takeoff and landing (VTOL) technology.
- Does not cover fly-by-wire electronic flight control systems.
- Does not cover pressurized cabins or high-altitude flight systems.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
Key facts
What made this novel
The innovation was realizing that an airplane needs to be controlled like a bicycle, using active wing-warping to manage roll, rather than just relying on inherent stability.
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 Wright Flyer
Early 20th-century biplanes
Modern aileron-based flight control systems
Why it matters
The bigger picture
This patent represents the birth of controlled, powered flight. It shifted aviation from unstable gliding to predictable, pilot-directed navigation, setting the technical standard for all subsequent fixed-wing aircraft development.
Filed
March 23, 1903
Granted
May 22, 1906
Market context
Who's building on this
Companies in this space
Every major aerospace manufacturer, including Boeing, Airbus, and Embraer, builds upon the fundamental principles of three-axis flight control established by this patent.
Market impact
This patent triggered a massive wave of litigationlitigationA lawsuit over patent infringement. Litigated patents often signal commercial importance.Read more → known as the 'Patent Wars' in early aviation, forcing the industry to consolidate and eventually leading to the formation of cross-licensing pools that allowed the aviation industry to scale.
Claim 1 — Plain English
What this patent covers
The patent describes a system for controlling a flying machine by warping the wings to maintain balance and steer. It utilizes a mechanism to twist the wing tips in opposite directions, creating a difference in lift that causes the aircraft to bank. This lateral control, combined with a vertical rudder, allowed the pilot to maintain stability against wind gusts and execute coordinated turns.
The clever bit
The innovation was realizing that an airplane needs to be controlled like a bicycle, using active wing-warping to manage roll, rather than just relying on inherent stability.
What it does not cover
- Does not cover jet propulsion or turbine engines.
- Does not cover vertical takeoff and landing (VTOL) technology.
- Does not cover fly-by-wire electronic flight control systems.
- Does not cover pressurized cabins or high-altitude flight systems.
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
Early stage
Citation count
26/40
Moderately 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
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
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
$14K – $46K
Midpoint $29K · 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
Wright, W., & Wright, O. (1906). How the Wright Brothers Invented Modern Airplane Control (U.S. Patent No. 821,393). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/821393/wright-brothers-flying-machine
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 the Wright Brothers Invented Modern Airplane Control cover?
The foundational patent for the first successful powered, heavier-than-air flying machine that could be controlled in flight.
Who owns patent US 821393?
Individual owns this patent, granted in 1906.
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 821393 cited by?
This patent has been cited by 19 later patents that build on its ideas.
What problem does this patent solve?
This patent represents the birth of controlled, powered flight. It shifted aviation from unstable gliding to predictable, pilot-directed navigation, setting the technical standard for all subsequent fixed-wing aircraft development.
What does this patent NOT cover?
Does not cover jet propulsion or turbine engines.
Same assignee
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