US 5,724,265 · Granted 1998-03-03
The 1998 Shoe Sensor That Predicted Today's Fitness Trackers
Imagine a shoe sole packed with motion sensors that counts your steps, measures how high you jump, and beams all that data to a wristwatch in real time. This 1998 patent describes exactly that—the ancestor of modern running watches that track distance and speed without needing GPS.
The plain-English version
What it protects
The claim covers a shoe-based motion measurement system: accelerometers and rotation sensors embedded in a shoe sole that calculate step distance and jump height, paired with a wireless transmitter that sends this data to a wristwatch receiver. The wristwatch microprocessor then converts that step data into total distance and speed, displaying the results on a screen. What's protected here is the specific architecture of putting the sensors in the shoe itself and using wireless communication to a central wrist display.
Why it matters
This patent represents an early vision of wearable fitness technology that predates modern smartphone fitness apps and GPS running watches by years. At the time, embedding sensors in shoes and transmitting wirelessly to a wrist display was genuinely innovative—it solved the problem of measuring running distance and speed without relying on satellites or phones. The patent shows how inventors were already thinking about distributed sensor networks and real-time biometric feedback in the mid-1990s, laying conceptual groundwork for today's smartwatch ecosystem.
Real-world use
When you put on a modern running watch that estimates your distance and pace from your footsteps, you're using the same core idea: motion sensors in your shoe or on your wrist detecting movement and calculating speed and distance 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 5,724,265
- Filing date
- 1995-12-12
- Grant date
- 1998-03-03
- Assignee
- Hutchings; Lawrence J.
- Inventor(s)
- HUTCHINGS; LAWRENCE J.
- CPC class
- A63B24/0021
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