One belt, two parts of the body protected
A three-point seatbelt combines a lap belt with a diagonal strap across the chest. Its three anchor points hold the wearer at the hips and upper body, helping keep both from pitching forward in a crash. That matters because a belt that restrains only the waist can leave the torso moving forcefully toward the dashboard or windshield.
The design also made restraint practical for everyday driving: the driver could secure one continuous belt across the body rather than manage separate straps. A safety feature only protects people if it is usable often, and in ordinary cars, not just specialized vehicles.
The commercial tradeoff
A patent normally gives its holder the right to control who uses an invention, which can create a business advantage. Volvo’s choice removed that barrier for other automakers. Instead of making the belt a feature only its own customers could get, the company allowed a design with broad safety value to spread across competing cars.
That choice reflects a basic tension in product development: exclusive rights can reward the company that invests in an innovation, but they can also limit how widely it is adopted. With a seatbelt, the benefit does not stop at the buyer of one brand. More widespread use means more people in more kinds of cars can be restrained in a crash. Volvo gave up control over a valuable design so its protection could extend beyond its own showroom.
