Average Co-Inventor Count = 2.14
ph-index = 7
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. Sony Corporation (8 from 58,130 patents)
2. Pentel Kabushiki Kaisha (2 from 264 patents)
10 patents:
1. D507811 - Ball point pen
2. D504465 - Cap for a writing instrument
3. D459378 - Electronic still camera
4. D457515 - Earphone
5. D450713 - Audio player
6. D445103 - Tape player
7. D438527 - Tape player
8. D436103 - Front portion of tape player
9. D413593 - Selecting device
10. D410925 - Audio disc player combined with radio receiver and tape recorder