At last, after two years, Wu finished the world's first four-wheeled electric mobility scooter, and in 1989 he secured patents in the US and Europe, showcasing it under the trademark Shoprider at an international medical supplies exhibition in Atlanta that year.
終於，花了 2 年時間，伍必翔完成了世界第一台四輪型電動代步車，並在 1989 年拿到美國和歐洲二十餘國的發明專利，同時以「Shoprider」為商標，參加美國亞特蘭大的國際醫療器材展。