Average Co-Inventor Count = 1.85
ph-index = 2
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Happy Industrial Corporation (3 from 4 patents)
2. Happy Mishin Seizou Kabushiki Kaisha (1 from 1 patent)
4 patents:
1. D735249 - Sewing machine
2. 8886352 - Electronic sewing machine
3. 4708074 - Device for generating stitch forming data in a sewing machine
4. 4658744 - Cam-using electronic control sewing machine