PATENTED TECHNOLOGY US and International Patents protect our unique Electro-Drive™ and US Pro Drive™ propulsion systems. These systems are the backbone of our scooters and bicycles, powering these vehicles with efficient and environmentally friendly, high performance drive systems for sport or transportation. U.S. Patents: 5,934,401; 5,937,964 & 6,269,898; International Patents: PCT/US98/03804 & W098/41438 Just try one of our vehicles and you will understand why our technologies are protected by these worldwide patents.