Depending on your sensitivity filter, there are over 300,000 US patents, of which perhaps 10% have been incorporated into a commercially successful product. https://www.uspto.gov/web/offices/ac/ido/oeip/taf/h_counts.htm
Depending on your sensitivity filter, there are over 300,000 US patents, of which perhaps 10% have been incorporated into a commercially successful product. https://www.uspto.gov/web/offices/ac/ido/oeip/taf/h_counts.htm