US 4,367,752 · Granted 1983-01-11
The 1983 Patent That Invented the Fitness Tracker
This patent describes one of the earliest wearable fitness devices—a belt-worn gadget with a heart rate monitor and motion sensor that counts your exercise reps and displays your workout stats on a tiny digital screen. It's basically the great-grandfather of your Apple Watch or Fitbit.
The plain-English version
What it protects
The claim covers a wearable system that combines a heart rate sensor worn on the body, an accelerometer or motion detector to count repetitive limb movements, a keyboard for entering personal health data, a digital computer that processes all these signals together, and a visual display that shows workout metrics one at a time when you press different buttons. What's protected is the specific way these components talk to each other to give real-time feedback on physical activity.
Why it matters
This patent arrived at the birth of personal fitness monitoring, years before smartphones made wearables mainstream. It represents an early vision of portable health tracking—combining heart rate and movement data in a single wearable device. The patent demonstrates how engineers were already thinking about miniaturized sensors and real-time biometric feedback in the early 1980s, laying conceptual groundwork for the multi-billion-dollar wearables industry that emerged decades later.
Real-world use
When you strap on any fitness watch or chest heart-rate monitor that counts your steps and displays your heart rate, you're using technology descended from the architecture this patent protected.
Original USPTO abstract
The physical condition of a subject is tested by a transducer mounted on the subject which derives a first signal indicative of heart activity. An electronic instrument housing carried by the subject includes terminals responsive to the first signal and (a) an inertial member for monitoring the quantity of repetitive actions taken by a limb of the subject and for deriving a second signal indicative of the quantity, (b) a keyboard for enabling signals to be derived indicative of numerical quantities associated with plural physiological parameters of the subject, (c) a clock source for deriving timing signals, (d) a digital computer responsive to the first, second, timing and keyboard signals for deriving plural digital output signals indicative of different physical activities of the tested subject, (e) a visual digital indicator, (f) plural key switches, each associated with a different one of the physical activities, and (g) circuitry responsive to activation of the plural key switches for selectively coupling different ones of the plural output signals to the visual indicator so only one of the output signals is supplied to the indicator at a time.
Patent details
- Publication number
- US 4,367,752
- Filing date
- 1980-04-30
- Grant date
- 1983-01-11
- Assignee
- Biotechnology, Inc.
- Inventor(s)
- JIMENEZ; OSCAR, BIANCO; FRANK J.
- CPC class
- A61B5/7475
Want to file your own patent?
If you're designing a new fitness gadget or wearable sensor, check our free scanner to see if your innovation might overlap with existing patents in the sports and fitness space.
Free patentability scan