Average Co-Inventor Count = 2.57
ph-index = 3
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. Matsushita Electric Works, Ltd. (3 from 1,623 patents)
3 patents:
1. D512755 - Exercise device
2. D507312 - Exercise device
3. D459419 - Physical training instrument