US 6,305,221 · Granted 2001-10-23
The Shoe Sensor Patent That Started the Running Watch Revolution
Imagine a shoe with tiny motion sensors that count your steps, measure how far you've run, and calculate your speed—then wirelessly beam all that data to a watch on your wrist. This patent describes exactly that system, turning your sneaker into a personal fitness computer.
The plain-English version
What it protects
The claim covers a system where accelerometers and rotational sensors embedded in a shoe's sole measure step distance and jump height, process that data through an on-board circuit, and transmit the results via radio frequency to a wearable receiver. What's protected here is the complete chain: the sensors in the shoe, the wireless transmission method, the microprocessor logic that calculates speed and total distance from individual steps, and the display interface that shows the runner or walker their performance metrics.
Why it matters
This patent captures the foundational concept of wearable fitness tracking—the idea that shoes themselves could become smart devices that quantify athletic performance without requiring external cameras or GPS. Filed in 1999 and granted in 2001, it arrived during the early days of consumer fitness gadgets, before smartphones made fitness tracking ubiquitous. The patent establishes a direct lineage to modern running watches and activity trackers that rely on step-counting and motion sensors to estimate distance and calories burned.
Real-world use
Every Nike+iPod running watch that synced your shoe data to a wristwatch device relied on this core concept of embedding sensors in footwear to track your workout in real time.
Original USPTO abstract
A device that measures the distance traveled, speed, and height jumped of a person while running or walking. Accelerometers and rotational sensors are placed in the sole of one shoe along with an electronic circuit that performs mathematical calculations to determine the distance and height of each step. A radio frequency transmitter sends the distance and height information to a wristwatch or other central receiving unit. A radio frequency receiver in the wristwatch or other unit is coupled to a microprocessor that calculates an output speed based upon step-distance and elapsed time, and the distance traveled of the runner from the sum of all previous step distances. The output of the microprocessor is coupled to a display that shows the distance traveled, speed, or height jumped of the runner or walker.
Patent details
- Publication number
- US 6,305,221
- Filing date
- 1999-06-14
- Grant date
- 2001-10-23
- Assignee
- Aeceleron Technologies, Llc
- Inventor(s)
- HUTCHINGS LAWRENCE J.
- CPC class
- A63B24/0021
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