Apparently he invented tiny incremental improvements on paper and used a trick to delay the patent submitting process so that he could incorporate existing technologies into patents filed ages ago. He also made the patents huge, vague and filed them again and again after refusal. Then he started to sue and sue and sue.

The Patent King He has a staggering 558 patents, costing companies around the world some $1.5 billion in licensing fees. But what did Jerome Lemelson actually invent? – May 14, 2001.