Volvo opened up the patent for three-point seatbelt cause “it had more value as a free life saving tool than something to profit from”

Why Volvo gave away the patent for their most important invention

The man who saved a million lives

Automotive Hall of Fame.

Bohlin, a former aviation engineer at Saab who worked on ejector seats, knew an effective belt must absorb force across the body yet be so easy to use even a child could buckle up. His ingenious solution took the form of a combined lap belt with a diagonal belt across the chest. He anchored the straps low beside the seat so the geometry of the belts formed a “V” with the point directed at the floor. That design meant the belt would remain in place and not shift under a load.
Source: https://www.arnoldclark.com/newsroom/265-why-volvo-gave-away-the-patent-for-their-most-important-invention